摘要：
英语中的六大从句1. 名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）2. 定语从句3. 状语从句（包括时间、条件、结果、目的、原因、让步、地点、方式等）。1）主语从... 英语中的六大从句
1. 名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）2. 定语从句3. 状语从句（包括时间、条件、结果、目的、原因、让步、地点、方式等）。1）主语从句用作主语，如：That the earth is round is true. 地球是圆的是真实的。2）宾语从句用作宾语。如：Do you know where he lives?3）表语从句用作表语，如：My opinion is that you should not go alone. 我的意见是你不应单独前往。4）同位语从句用于解释说明前面的名词。如：The fact that the earth is round is true. 地球是圆的的事实是真实的。（that从句用于解释说明the fact）5）定语从句相当于一个形容词，用于修饰前面的名词。如：The student who answered the question was John. 回答问题的学生是John.6）状语从句相当于一个副词，如：When it rains, I usually go to school by bus. 天下雨时，我通常坐公共汽车上学。（时间状语）
有三大类 1.名词性从句 2.定语从句 3.状语从句 名词性从句中分： 1.主语从句：例,it is important to read book.(形主it作主语,真正的主语是to read book) that air has pressure was known long ago.(关联词that引导的句子that air has pressure作主语从句) 2.宾语从句：I think it necessary that he should do his homework.(形式宾语it引导的) I'm sure that my test will succeed.(sure后用that引导的宾从) 3.表语从句：系动词后的从句 it may be as you say(be是系动词,后面用as引导的) this is that he is too young to go to school.(有系动词is,后面由that引导的表语从句) 4.同位语从句：同位语从句是对前面名词的解释说明,如： The facts that he had done his homework.(事实就是he had done his homework,是对前面the facts的解释,是什么事实) 定语从句：在句子中起定语作用,修饰剧中的名词或代词的从句叫定从 例：the man (who is shaking hands with my father) is my teacher.(括号中就是定从,修饰限定the man) BeiJin is a city (which has a long history).(括号中是定从,修饰the city) 状语从句：在复合句中担任状语成分的从句叫状语从句 例：I will tell her about that (when i see her).为时间状从 just stay (where you are).为地点状语 Because he is ill,he is absent today.为原因状语 这也很局限,其实要讲的还很多,你可以多看看语法书之类的
根据从句语法功能的不同可分为:主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。
前四类由于主语从句、表语从句、宾语从句及同位语从句在句子的功用相当于名词，所以通称名词性从句；定语从句功能相当于形容词，称为形容词性从句;而状语从句功能相当于副词，称为副词性从句。
状语从句还可以分为条件状语从句、原因状语从句、地点状语从句、目的状语从句、让步状语从句、比较状语从句、方式状语从句、结果状语从句和时间状语从句。
状语从句
由从句担任的状语，在句子中可修饰谓语（或其它动词)、形容词、副词或是整个句子，它可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。
状语从句是一较大的语法项目，也是近几年高考题中常见的一个重要试点。高考中己考查了时间、让步、地点、条件、目的等状语从句，这些从句仍是今后高考热点，应作充分准备。同时对方式状语从句也应引起重视。
从句是相对于主句而言的，即它是从属于某一个主句，而不能单独作一个句子。在英语中，主要有三大从句，即名词性从句（包括主语从句，宾语从句，表语从句，同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。 主语从句用作主语，如：： That the earth is round is true. 地球为圆的是真实的。 宾语从句用作宾语。如： Do you know where he lives? 表语从句用作表语，如： My opinion is that you should not go alone. 我的意见是你不应单独前往。 同位语从句用于解释说明前面的名词。如： The fact that the earth is round is true. 地球是圆的的事实是真实的。（that从句用于解释说明the fact） 定语从句相当于一个形容词，用于修饰前面的名词。如： The student who answered the question was John. 回答问题的学生是John. 状语从句相当于一个副词，如： When it rains, I usually go to school by bus. 天下雨时，我通常坐公共汽车上学。（时间状语） If he comes tomorrow, you will see him. 如果他明天来，你就可以看见他。（if 引导的条件状语从句，其结构为：if +状语从句，＋主句）。要注意在状语从句中有一个规则是“主将从现”，即主句是将来时，则从句要用一般现在时表示将来。 主句和从句的划分方法是相同的。句子的成分从谓语动词处来划分比较容易。谓语动词前面的部分是主语，后面常接宾语，修饰谓语动词的是状语，修饰主语、宾语的是定语，若谓语是系动词，则系动词后的部分是表语。如： I am a teacher. 其中，I 是主语，am是谓语，a teacher 是表语。 He likes playing football very mucy. 其中，he是主语，likes是谓语，playing football是宾语，very much是状语 1.主语从句（Subject Clause）：用作主语的从句叫主语从句。引导主语从句的关联词有从属连词、疑问代词、疑问副词、缩合连接代词、缩合连接副词等。 2.表语从句（Predicative Clause）：用作表语的从句叫表语从句。引导表语从句的关联词与引导主语从句的关联词大都一样。 3.宾语从句（Object Clause）：在句子中起宾语作用的从句叫做宾语从句.宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句。 4.同位语从句是名词性从句(主语从句、表语从句、宾语从句、同位语从句)中的主要从句之一，从句作同位语表示与之同位的名词(短语)的实际内容，它的作用相当于名词，对前面的名词(短语)加以补充说明或进一步解释，相当于一个表语从句，它们之间的关系是同位关系，即主表关系。 5.定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面
高中英语六大从句
定语从句及相关术语 1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。2.关系词：引导定语从句的关联词称为关系词，关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等；关系副词有where, when, why等。关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。注：关系代词有主语.宾语之分。一般whom作为宾语。4.定语：定语用来限定、修饰名词或代词的，是对名词或代词起修饰、限定作用的词、短语或句子，汉语中常用‘……的’表示。主要由形容词担任。此外，名词，代词，数词，分词，副词，不定式以及介词短语也可以来担任，也可以由一个句子来担任．单词作定语时通常放在它所修饰的词之前，作前置定语。短语和从句作定语时则放在所修饰的词之后，作后置定语。（一） 限定性定语从句一、关系代词（在句中作主语、宾语或定语）1. that既可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语也可以省略。[eg：this is the book （which）you want。]而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置 2. which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢3. 代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括当先行词是anything, everything, nothing , none等不定代词时，或者是由every, any, all, some, no, little, few, much等修饰时等，这时的that常被省略 还有先行词前有序数词或形容词最高级修饰时,或先行词就是序数词或最高级时.以及先行词中既有人又有物时.还有句中前面有which时,都只能用that4. who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语 5. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格.它引导的从句可以修饰人和物, 当它引导的从句修饰物体时, 可以与 of which 调换,表达的意思一样。
你可以去百度文库搜一下哦，关于that引导的各种从句我看过，非常细，你去看一下吧！
名词从句、定语从句名词从句 名词从句有四类：宾语从句、主语从句、表语从句、同位语从句。例如： 宾语从句：I don’t know where he will go. 主语从句：Where he will go is unknown. 表语从句：The problem is how we can get so much money. 同位语从句：We all feel sorry about the news that he failed in the game. 下面几点是学习名词从句要加以注意的： 1． whether和if都可以引导宾语从句表达“是否”意，（即引导宾语从句时if和whether 可以互换）但以下几种名词从句要用whether（不用if）引导： （1） 引导主语从句，且在句首时。例：Whether he has won the tennis is not known.(但 It is not known whether/if he has won the tennis). （2） 引导表语从句时。例The problem is whether he can get a job. （3） 引导同位语从句时。例：I have no idea whether he will come. （4） 介词后的whether从句。例：I worry about whether I hurt her feelings. 2． 位于句首引导主语从句的that不可忘。 例如：That he got the first place in the competition surprised all of us. 3． 在“It is suggested/proposed/ordered/a pity/no wonder/necessary/strange/…＋ that从句”结构中，that从句谓语有时用（should）do这样的虚拟语气形式。 例如：It is suggested that we(should) improve the relations between us. It is a pity that one(should) stay in one place all one´s life. It is strange that she should have failed to see her own shortcomings（缺点）. 4． 在“The reason why…is that…”句式中that不要误为because. 例如：The reason why he didn´t go to school yesterday is that he was ill. 5． 名词从句中that,what用法比较： 引导名词从句的that是连词，在句中无成份，无意义，而what是连接代词，what＝the thing(s) that. 例如：It was told in yesterday´s newspaper that what the students had done was praised by the factory. I know that he will study. I know what he will study. That he works hard at his lessons is known to us all. What he works hard at is known to us all. All I ask is that you should tell the truth./He is not what(＝the person that)he used to be.他和以前大不相同了。 6． where在名词从句中的使用特点： where在名词从句中有时可以变为“the place where”,有时可以变为“介词＋the place where” 形式。例如： 主从：Where(＝The place where)she has gone is still unknown. 宾从：Would you please tell me where(＝the place where) Mr Smith lives? 表从：Your dictionary remains where(＝in/at the place where)you put. 同位从：Have you any idea where(＝of the place where) she is spending her holidays? 7． 无论是哪种名词从句都是陈述语序。例如： I know where he lives./Please tell me what her name is. 当一个特殊疑问句本身就是陈述语序（即“主＋谓＋（宾）”或“主＋系＋表”结构），将其变为间接引语（即宾语从句）时，无需改变语序。例如： What´s the matter with him? She asked me what was the matter with him. Who looks after your grandfather? He asked me who looked after my grandfather. 名词从句考点分析 1．They want to know ______ do to help us. (NMET) A. what they can B. how they can C. how can they D. what can they 析：此题要选陈述语序项，故应排除C、D。又因how they can do不完整，do后无宾 语，故也应排除，只有A项既是陈述语序，且what they can do完整正确地表达出“他 们能做些什么”这一意思，故答案为A。 2．His teacher ______ he ______ bright and ______ he was worth teaching. A.didn’t think;was;that B.thought;was;whether C.didn’t think;was;× D.thought;wasn´t;× 析：观察题目，可知think后跟有and连接的两个并列宾语从句，这时前一个宾语从句 的引导语that可以省略，但引导后一宾语从句的that不可省略，据此，可排除C、D 两个选项。若选B项，全句意思不通，而选择A项可表达“他的老师认为他不聪明，不 值得教”这一意思，且语法结构无误，故可定A是正确答案。 3．______ is done cannot be undone. A.How B.That C.What D.Where 析：do一般作及物动词使用，从题干看，需选一词作主语（逻辑上是done的宾语）。 而A.How,D.Where均是副词，不能作主语，故应排除。B项that一词只能在定语从句 中作主语，不能在主语从句中作主语，也应排除。只有选what(＝the thing that),才 能正确表述“凡是做的不可不做”这一意思。 4．Take care ______ you don´t make mistakes in the coming exam. A.of that B.about that C.for what D.that 析：take care是“注意”、“当心”意，后面可跟that引导的宾语从句来表达“当心 不要…”意思，据此，该题应选D。 5．To his surprise,the umbrella was not ______ he had put. A.which B.where C.the place D.that 析：观察题干，was not后是表语，根据where在表语从句中相当于in/at the place where, 将其置于空白处则可表达“伞不在他当初放的地方”这一意思，而C选项缺少词，不可 选。A、D项皆不合用。 6．______ we can´t get seems better than ______ we have. A.what;what B.what;that C.that;that D.that;what 析：此题显然是要表达“我们得不到的东西似乎比我们得到的东西好。”这一意思，即 “A seems better that B”结构，根据what＝the thing(s) that这一特点，将其置 于两空白处正好可以表达出前者比后者好这一意思，故答案为A。 7．______ we’ll go camping tomorrow depends on the weather. A.If B.Whether C.That D.Where 析：此题depends前的主语从句是一个不肯定的内容，在句首表“是否”意时，只能用 Whether,不可用If。故答案为B。 8．______ they are most interested in is ______ they can produce more and better cars. A.That;how B.What;how C.What;what D.That;that 析：is前面是一个主语从句，要表达“他们最感兴趣的（东西）”这一意思，只能选what 填入空白;is是表语从句，显然只有选how才能表达“如何生产更多更好的汽车”，故 答案为B。 9．He made a suggestion that the English test ______ until next Wednesday. A.will be put off B.be put off C.will put off D.put off 析：suggestion,order,adivce等词后的同位语从句谓语要用（should）do的形式，且 该句中test与put off为被动关系，故选B。 10．I don´t think ______ he said something like that is right. A.that B.what C.whether D.when 析：此句think后是一宾语从句，这个宾语从句的主语在is之前，它是一个被动句。 因为he said something like that已经含有主、谓、宾、状等成分，只有选不表意义， 不做成分的that才合适，故选A。 定语从句 一、 定语从句与引导词 定语从句是在复合句中修饰某一名词或代词的从句。被修饰的名词或代词叫做选行词， 而引导定语从句的词叫引导词，有关系代词和关系副词两类。 懂得什么样的先行词后用什么样的引导词是学好定语从句的关键。 1． 关系代词有：that,which,who,whom,whose,在定语从句中作主语、宾语中表语，whose 作定语。代人的有：who,whom,whose,that；代物的有：that,which,whose.例如： The man who helped you is Mr White.(who代人，在定语从句中作主语) That is the person(whom/who/that) you want to see.(whom,who,that代人，在定 语从句中作宾语，可省略) I´m not the fool(that) you thought me to be.(that代人，在定从中作表语) A dictionary is a useful book which(＝that) tells us the meaning of words(which 或that代物，在定从中作主语) 2． 关系副词有：when(指时间)，where(指地点),why(指原因)，在定语从句中作状语。 例如：Would you suggest a time(when) we can have a talk?(when可省略) The house where they live is not very large./This is the reason why he did not came to the meeting. 注意：不是表时间的先行词都用when引导定从，不是表地点的先行词都用where引导定从。例如：We´ll visit the factory which(＝that) makes radios. (which或that在定从中作主语，where不可用主语，故不可用) They still remember the happy days(which/that) they spent in Beidaihe. (which或that在定从中作spent的宾语，when不可作宾语，故不可用) 二、限制性定语从句与非限制性定语从句 限制性定语从句和主句之间不用逗号分开，修饰主句中的某一个名词或名词词组或代 词；非限制性定语从句常用逗号和主句隔开，可以修饰主句中的某一个词，也可修饰整个句子。非限制性定语从句不能用that引导，引导非限制性定语从句的关系词不能省略。非限制性定语从句例：Li Ping´s father, who works in a factory, is an engineer./He tore up my photo, which made me very angry.(which指代主句内容，因前后两句是因果关系，此时which不可换为as。) He is good at physics, as is known to us all.＝As is known to us all, he is good at physics.(as指代主句内容，在as is known/believed, as we all know/believe这类结构中as不可换为which) 三、 只用that引导和不用that引导的场合 1． 只用that引导和不用that引导的场合 1） 当先行词既包括人又包括物时：He talked about the men and the books that attracted him. 2） 指物的先行词被any, every, only, very, all, no等修饰时：These are the very points that interest me./That´s the only watch that I like most. 3） 指物的先行词被序数词或形容词最高级修饰时：The first step that we are to take is very difficult./This is the second card that he gave me. 4） 先行词是指物的不定代词all,little,few,much,及everything,anything,nothing等时：There is still much that can be done about it./Have you got everything that you need? 5） 先行词是who时：Who that have seen him does not like him? 2． 不用that的场合如下： 1）非限制性定语从句中 Last night ,I saw a very good film,which was about the Long March . 2）介词放在关系代词之前时 This is the man from whom I learnt the news 3）句中出现了that，或先行词是that时 I have found that which I was looking for. 四、“介词＋关系代词”用法 1． 介词的确定应依据定语从句中短语的习惯性搭配，例如：Who is the girl with whom you just shook hands?(shake hands with…是习惯性搭配) 2． 介词常受先行词的制约（即介词和先行词的搭配），例如：He built a telescope through which he could study the skies.(through which 即through the telescope) 3． 当关系代词作“动词＋介词”固定短语的宾语时，此时因定短语中的介词不能拆开移到关系代词前。例如：This is the watch which you´re looking for./He is a kind of man whom you can safely depend on. 五、几个名词后的引导词 1. situation后常用where,in which引导定语从句：Can you imagine a situation where/in which you can use the word? 2. way(方式，方法)后常用in which或that或how引导定语从句，也可省略：Do you know the way(in which/that/how) he worked out the problem? 3. “the same＋名词”，“such＋名词”，“as＋名词”后通常用as引导定语从句。 例如：I have the same dictionary as you(have)./Such a book as you bought is not worth buying. 定语从句考点分析 1． The best work ______ Luxun wrote and ______ I have read has been made into a film. A.which;that B.that;× C.×;that D.×;× 析：如果两个定语从句并列，关系代词作宾语时前一句的可以省略，但后一句的不可省略，故应选C。 2． It was in 1969 ______ two Americans got to the moon by space ship. It was 1969 ______ two Amerians got to the moon by space ship. A.when B.which C.that D.× 析：第一句是强调时间in 1969,强调结构是“It was＋强调部分＋that句”，故应选C。第二句It是表时间的，先行词1969在从句中作状语，故选A。 3． Is this the house ______ Shakespeare was born? A.at which B.which C.in which D.at where 析：观察题目，空白处只有填in which或where才能表达“这是莎士比亚出生的房子吗？”这一意思，故答案为C。 4． Is this house ______ Shakespeare was born? A.where B.which C.in which D.at which 析：将此句变为陈述句；This house is ______ Shakespeare was born.显然is后是一表语从句，只有选where(＝the place where)才能表达“这是莎士比亚的出生地”这一意思，故答案为A。 5． In the dark street,there wasn’t a single person ______ she could turn for help. A.to whom B.of whom C.from whom D.that 析：“介词＋关系代词”要考虑短语搭配或与先行搭配，这道题短语turn to有关，故 应选A。 6． The two things ______ they felt very proud were Jim´s gold watch and Della´s hair. A．about which B.of which C.in which D.for which 析：涉及be/feel proud of短语，故答案为B。 7． Have you ever asked him the reason ______ may explain his being late. A.why B.that C.for which D.what 析：此题易误选A、C，因为先行词是the reason,但细观察分析，定语从句缺少主语，所以答案是B。注意what不能引导定语从句。 8． Farming is difficult ______ there is no rain. A.where B.in place C.that D.the place where 析：因为difficult是形容词，故其后不是定语从句。这儿的空白处应填引导状语从句where(＝in the place where),全句表达“在没有雨水的地方耕种困难”。这一意思，可见答案为A。 9． We need the same machine ______ in your factory. A.which is being used B.as is being used C.that is being used D.as it is being used 析：根据“the same＋先行词”后跟as引导定语从句的原则，可知答案为B。 10．______ the people,not things ______ are most important. A.There are;who B.Those are;that C.It is;that D.It was;who 析：仔细观察分析题目，可知只有C构成强调句才有成立。当我们要检验视其为强调 句的判断是否正确时，只要将“It is (或was)…that”这三个词去掉，剩下部分读 起来正确无误，则证明判断是正确的，反之是错误的。此题如不填“It is…that” 三词，句子是The people,not things are most important.语义完整正确，说明选 C是对的。-------------------------------------------------------想要了解宾语从句,首先要知道英语中宾语有两种,一种是动词后面的宾语,另一种是介词后面的宾语,这样你就会发现哪些从句是宾语从句了.其次要知道宾语从句的引导词以及他们各自的意义和彼此间的区别. 第一种:当从句表达陈述意义时,要用that来引导宾语从句,这时that 还可省略. eg:He said (that) he would visit Beijing the next year. 第二种:当从句表达一般疑问语气时,要用whether 或if 引导.但注意介词后的宾语从句不用if 引导. eg:I wonder if/whether I can sit here. They are talking about whether they will have a picnic this weekend. 第三种:当从句表达一种特殊疑问语气时要用特殊疑问词(但在这里叫作连接代词或副词)引导. Could you tell me where I can buy such a pen. 第四种:引导词表示强调意义,这样的词有whatever,whichever ,whoever 等.这时不表示疑问.这种情况高中常出现. eg:I will believe whatever you said. 最后要注意从句要用陈述语序,既主语在前,谓语在后.
选d解析：此题考查句子逻辑关系和关联词的选择。题干前后分句为因果关系，前果后因，所以选用inthat表示“原因”，选项a和b一般用来引导定语从句，而sothat表示前因后果。
英语语法中的六大从句
根据从句语法功能的不同可以分为主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。
主语从句：用作主语的从句叫主语从句。引导主语从句的关联词有从属连词、疑问代词、疑问副词、缩合连接代词、缩合连接副词等。Whether we will go for an outing tomorrow remains unknown. 我们明天是否会去郊游仍旧未知。
表语从句：用作表语的从句叫做表语从句。引导表语从句的关联词与引导主语从句的关联词很多都一样。He has become a teacher. 他已经成为一名教师。
宾语从句：在句子中起宾语作用的从句叫做宾语从句.宾语从句分为三类：动词的宾语从句、介词的宾语从句和形容词的宾语从句。He told me that he would go to the college the next year. 他告诉我他将在下一年上大学。
同位语从句：同位语从句是名词性从句中的主要从句之一，从句作同位语表示与之同位的名词(短语)的实际内容，它的作用相当于名词，对前面的名词(短语)加以补充说明或进一步解释，相当于一个表语从句，它们之间的关系就是同位关系，即主表关系。
定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。This is the reason why he refused to help us. 这就是他拒绝帮助我们的原因。
时间状语从句：用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。连接时间状语从句的连接词有：when, before, after, while, as soon as, until, since. We were about to leave when he came in. 我们就要离开，就在那时他进来了。
根据从句语法功能的不同可分为：主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。
1、主语从句
主语从句就是作主语的从句。它的连接词有连词、连接副词、连词代词。主语从句放在句首时，句子显得很笨重，因此常用it作形式主语，而将真正的主语后置，比如：
It is a pity that you have missed such a wonderful concert.
真遗憾你错过了这么精彩的一场音乐会。
2、表语从句
表语从句就是作表语的从句。它的连接词有连词、连接副词、连词代词等。
比如：
My idea is that we meet at the bus stop.
我的想法是我们在公共汽车站会面。
3、宾语从句
宾语从句就是作宾语的从句。它的连接词有连词、连接副词、连词代词等。
比如：
She said that she would drop maths.
她说她要放弃数学。
4、同位语从句
同位语从句就是作同位语的从句，它的连接词有连词、连接副词等。
The fact that everyone loves beauty is common sense.
人人爱美是常识。
5、定语从句
定语从句就是作定语的从句。定语从句主要修饰、限定、描绘名词，有时修饰代词，放所修饰词后边。
比如：
The girl who wears a new dress is my daughter.
那个穿新衣服的女孩是我的女儿。
6、状语从句
状语从句就是作状语的从句。在复合句中修饰主句中的谓语动词、形容词或副词，起状语作用的从句叫作状语从句。
比如：
Soon after he jumps his parachute will open.
他跳伞之后，降落伞就会打开。
根据从句语法功能的不同可分为:主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。
前四类由于主语从句、表语从句、宾语从句及同位语从句在句子的功用相当于名词，所以通称名词性从句；定语从句功能相当于形容词，称为形容词性从句;而状语从句功能相当于副词，称为副词性从句。
状语从句还可以分为条件状语从句、原因状语从句、地点状语从句、目的状语从句、让步状语从句、比较状语从句、方式状语从句、结果状语从句和时间状语从句。
状语从句
由从句担任的状语，在句子中可修饰谓语（或其它动词)、形容词、副词或是整个句子，它可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。
状语从句是一较大的语法项目，也是近几年高考题中常见的一个重要试点。高考中己考查了时间、让步、地点、条件、目的等状语从句，这些从句仍是今后高考热点，应作充分准备。同时对方式状语从句也应引起重视。
英语六大从句
名词性从句：主语从句、宾语从句、表语从句、同位语 从句形容词性从句：定语从句副词性从句：状语从句（共9种：时间、地点、条件、 原因、让步、方式、比较、目的、结果）判断从句的类型往往是从从句的连接词和句子充当的成分的角度来辨别的，但在学习从句的实际过程中需要了解大量的语法规则及多做练习才能熟练运用，绝非三言两语就可以就能讲清的。学语言无捷径，好好努力吧，加油！
一、名词性从句 在句子中起名词作用的句子叫名词从句 (Noun Clauses）。 名词从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。（一）引导名词性从句的连接词 引导名词性从句的连接词可分为三类： 连接词：that,whether,if 不充当从句的任何成分） 连接代词：what, whatever, who, whoever, whom, whose, which. 连接副词：when, where, how, why 不可省略的连词： 1. 介词后的连词 2. 引导主语从句和同位语从句的连词不可省略。 That she was chosen made us very happy. We heard the news that our team had won. 比较：whether与if 均为"是否"的意思。 但在下列情况下，whether 不能被if 取代：1. whether引导主语从句并在句首2. 引导表语从句 3. whether从句作介词宾语4. 从句后有"or not" Whether he will come is not clear. 大部分连接词引导的主语从句都可以置于句末，用 it充当形式主语。 It is not important who will go. It is still unknown which team will win the match. （二）名词性that-从句 1）由从属连词that引导的从句叫做名词性that-从句。 That只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。名词性that-从句在句中能充当主 语、宾语、表语、同位语和形容词宾语，例如： 主语：That he is still alive is sheer luck. 他还活着全靠运气。 宾语：John said that he was leaving for London on Wednesday. 约翰说他星期三要到伦敦去。 表语：The fact is that he has not been seen recently. 事实是近来谁也没有见过他。 同位语：The fact that he has not been seen recently disturbs everyone in his office. 近来谁也没有见过他，这一事实令办公室所有的人不安。 形容词宾语：I am glad that you are satisfied with your job. 你对工作满意我感到很高兴。2）That-从句作主语通常用it作先行词，而将that-从句置于句末，例如： It is quite clear that the whole project is doomed to failure. 很清楚，整个计划注定要失败。 It's a pity that you should have to leave. 你非走不可真是件憾事。 用it作形式主语的that-从句有以下四种不同的搭配关系： a. It + be +形容词+ that-从句 It is necessary that… 有必要…… It is important that… 重要的是…… It is obvious that… 很明显…… b. It + be + -ed 分词+ that-从句 It is believed that… 人们相信…… It is known to all that… 从所周知…… It has been decided that… 已决定…… c. It + be +名词+ that-从句 It is common knowledge that… ……是常识 It is a surprise that… 令人惊奇的是…… It is a fact that… 事实是…… d. It +不及物动词+ that-分句 It appears that… 似乎…… It happens that… 碰巧…… It occurred to me that… 我突然想起…… （三）名词性wh-从句 1）由wh-词引导的名词从句叫做名词性wh-从句。Wh-词包括who, whom,. whose, whoever, what, whatever, which, whichever等连接代词和where, when, how, why等连接副词。Wh-从句的语法功能除了和that-从句一样外，还可充当介词宾语、宾语补语和间接宾语等，例如：主语： How the book will sell depends on its author. 书销售如何取决于作者本人。直接宾语：In one's own home one can do what one likes. 在自己家里可以随心所欲。间接宾语：The club will give whoever wins a prize. 俱乐部将给得胜者设奖。表语： My question is who will take over president of the Foundation. 我的问题是谁将接任该基金会主席职位。宾语补足语：She will name him whatever she wants to. 她高兴给他起什么名字就取什么名字。同位语： I have no idea when he will return. 我不知道他什么时候回来。形容词宾语：I'm not sure why she refused their invitation. 我尚不能肯定她为什么拒绝他们的邀请。介词宾语： That depends on where we shall go. 那取决于我们去哪儿。2）Wh-从句作主语也常用先行词it做形式主语，而将wh-从句置于句末，例如： It is not yet decided who will do that job. 还没决定谁做这项工作。 It remains unknown when they are going to get married. 他们何时结婚依然不明。（四）if, whether引导的名词从句 1）yes-no型疑问从句 从属连词if, whether引导的名词从句是由一般疑问句或选择疑问转化而来的，因此也分别被称为yes-no型疑问句从句和选择型疑问从句，其功能和wh-从句的功能相同， 例如： 主语：Whether the plan is feasible remains to be proved. 这一计划是否可行还有等证实。 宾语：Let us know whether / if you can finish the article before Friday. 请让我们知道你是否能在星期五以前把文章写完。 表语：The point is whether we should lend him the money. 问题在于我们是否应该借钱给他。 同位语：They are investigating the question whether the man is trustworthy. 他们调查他是否值得信赖。 形容词宾语： She's doubtful whether we shall be able to come. 她怀疑我们是否能够前来。 介词宾语： I worry about whether he can pass through the crisis of his illness. 我担心他是否能度过疾病的危险期。2）选择性疑问从句 选择性疑问从句由关联词if/whether…or或whethe…or not构成，例如： Please tell me whether / if they are Swedish or Danish. 请告诉我他们是瑞典人还是丹麦人。 I don't care whether you like the plan or not.我不在乎你是否喜欢该计划。（五）否定转移 1) 将think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。 I don't think I know you. 我想我并不认识你。 I don' t believe he will come. 我相信他不回来。注意：若谓语动词为hope,宾语从句中的否定词不能转移。 I hope you weren't ill. 我想你没有生病吧。2) 将seem, appear 等后的从句的否定转移到前面。 It doesn't seem that they know where to go. 看来他们不知道往哪去。 It doesn't appear that we'll have a sunny day tomorrow. 看来我们明天不会碰上好天气。3) 有时将动名词，介词短语或整个从句的否定转变为对谓语动词的否定。 I don't remember having ever seen such a man. 我记得从未见过这样一个人。 (not否定动名词短语 having…) It's not a place where anyone would expect to see strange characters on the street. 在这里，人们不会想到在街上会碰上陌生的人。 (anyone 作主语，从句中的谓语动词不能用否定形式。)4) 有时状语或状语从句中否定可以转移到谓语动词前。 The ant is not gathering this for itself alone. (否定状语) 蚂蚁不只是为自己采食。 He was not ready to believe something just because Aristotle said so. (否定because状语) 他并不因亚里斯多德说过如何如何，就轻信此事。 She had not been married many weeks when that man's younger brother saw her and was struck by her beauty. (否定状语many weeks) 她结婚还不到几个月，这个人的弟弟就看见她了，并对她的美貌着了迷。 二、定语从句 定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，被修饰的名词,词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。 关系代词有：who, whom, whose, that, which等。 关系副词有：when, where, why等。 （一）关系代词引导的定语从句 关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。1）who, whom, that 这些词代替的先行词是人的名词或代词，在从句中所起作用如下： Is he the man who/that wants to see you?他就是你想见的人吗？（who/that在从句中作主语） He is the man whom/ that I saw yesterday.他就是我昨天见的那个人。（whom/that在从句中作宾语）2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换）, 例如： They rushed over to help the man whose car had broken down. 那人车坏了，大家都跑过去帮忙。 Please pass me the book whose (of which) cover is green. 请递给我那本绿皮的书。3）which, that 它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如： A prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。（which / that在句中作宾语） The package (which / that) you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作宾语） （二）关系副词引导的定语从句 关系副词可代替的先行词是时间、地点或理由的名词，在从句中作状语。1）when, where, why 关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用，例如： There are occasions when (on which) one must yield. 任何人都有不得不屈服的时候。 Beijing is the place where (in which) I was born. 北京是我的出生地。 Is this the reason why (for which) he refused our offer? 这就是他拒绝我们帮助他的理由吗？2）that代替关系副词 that可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介词+ which"引导的定语从句，在口语中that常被省略，例如： His father died the year (that / when / in which) he was born. 他父亲在他出生那年逝世了。 He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十年前居住过的地方。 （三）判断关系代词与关系副词 方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如： This is the mountain village where I stayed last year. I'll never forget the days when I worked together with you. 判断改错（注：先显示题，再显示答案，横线；用不同的颜色表示出。） （错） This is the mountain village where I visited last year. （错） I will never forget the days when I spent in the countryside. （对） This is the mountain village (which) I visited last year. （对） I'll never forget the days (which) I spent in the countryside. 习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。 方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词。例1. Is this museum ___ you visited a few days age? A. where B. that C. on which D. the one例2. Is this the museum ____ the exhibition was held. A. where B. that C. on which D. the one答案：例1 D，例2 A例1变为肯定句： This museum is ___ you visited a few days ago.例2变为肯定句： This is the museum ___ the exhibition was held. 在句1中，所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有the one既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。 而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。 关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词 (who, whom, that, which, whose)； 先行词在从句中做状语时，应选择关系副词 ( where 地点状语，when 时间状语，why 原因状语) 。（四）限制性和非限制性定语从句 1) 定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如： This is the house which we bought last month. 这是我们上个月买的那幢房子。（限制性） The house, which we bought last month, is very nice.这幢房子很漂亮，是我们上个月买的。（非限制性）2) 当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如： Charles Smith, who was my former teacher, retired last year. 查理·史密斯去年退休了，他曾经是我的老师。 My house, which I bought last year, has got a lovely garden. 我去年买的的那幢房子带着个漂亮的花园。 This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。3) 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句谓语动词要用第三人称单数，例如： He seems not to have grasped what I meant, which greatly upsets me. 他似乎没抓住我的意思，这使我心烦。 Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。说明：关系代词that和关系副词why不能引导非限制性定语从句。（五）介词+关系词 1）介词后面的关系词不能省略。2）that前不能有介词。3） 某些在从句中充当时间，地点或原因状语的"介词+关系词"结构可以同关系副词when 和where 互换。 This is the house in which I lived two years ago. This is the house where I lived two years ago. Do you remember the day on which you joined our club? Do you remember the day when you joined our club?（六）as, which 非限定性定语从句 由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。 As we know, smoking is harmful to one's health. The sun heats the earth, which is very important to us. 典型例题 1）Alice received an invitation from her boss, ___came as a surprise.A. it B. that C. which D. he 答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。2）The weather turned out to be very good, ___ was more than we could expect. A. what B. which C. that D. it 答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。3）It rained hard yesterday, ____ prevented me from going to the park..A. that B. which C. as D. it 答案B. as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点： (1） as 引导的定语从句可置于句首，而which不可。 (2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。 在本题中，prevent由于是行为动词，所以正确选项应为B。As 的用法例1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。 I have got into the same trouble as he (has).例2. as可引导非限制性从句，常带有'正如'。 As we know, smoking is harmful to one's health. As is know, smoking is harmful to one's health. As是关系代词。例1中的as作know的宾语；例2中，它充当从句的主语，谓语动词know要用被动式。（七）as, which 非限定性定语从句 由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。 As we know, smoking is harmful to one's health. The sun heats the earth, which is very important to us. 典型例题 1）Alice received an invitation from her boss, ___came as a surprise.A. it B. that C. which D. he 答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。2）The weather turned out to be very good, ___ was more than we could expect. A. what B. which C. that D. it 答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。3）It rained hard yesterday, ____ prevented me from going to the park..A. that B. which C. as D. it 答案B. as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点： (1） as 引导的定语从句可置于句首，而which不可。 (2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。 在本题中，prevent由于是行为动词，所以正确选项应为B。As 的用法例1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。 I have got into the same trouble as he (has).例2. as可引导非限制性从句，常带有'正如'。 As we know, smoking is harmful to one's health. As is know, smoking is harmful to one's health. As是关系代词。例1中的as作know的宾语；例2中，它充当从句的主语，谓语动词know要用被动式。（八）先行词和关系词二合一 1)Whoever spits in public will be punished here. (Whoever 可以用 anyone who 代替) 2)The parents will use what they have to send their son to technical school. (what 可以用all that代替) （九）what/whatever;that/what; who/whoever 1）what = the thing which；whatever = anything What you want has been sent here. Whatever you want makes no difference to me. 2) who= the person that whoever= anyone who （错）Who breaks the law will be punished. （错）Whoever robbed the bank is not clear. （对）Whoever breaks the law will be punished. （对）Who robbed the bank is not clear.3) that 和 what 当that引导定语从句时 ，通常用作关系代词，而引导名词性从句时，是个不充当任何成分的连接词。宾语从句和表语从句中的that常可省略。What只能引导名词性从 句， 用作连接代词，作从句的具体成分，且不能省略。 I think (that) you will like the stamps. What we need is more practice.（十）关系代词that 的用法 1）不用that的情况 a) 在引导非限定性定语从句时。 (错) The tree, that is four hundred years old, is very famous here. b) 介词后不能用。 We depend on the land from which we get our food. We depend on the land that/which we get our food from.2) 只能用that作为定语从句的关系代词的情况 a) 在there be 句型中，只用that，不用which。 b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。 c) 先行词有the only, the very修饰时，只用that。 d) 先行词为序数词、数词、形容词最高级时，只用that。. e) 先行词既有人，又有物时。举例： All that is needed is a supply of oil. 所需的只是供油问题。 Finally, the thief handed everything that he had stolen to the police. 那贼最终把偷的全部东西交给了警察。三、状语从句 （一）地点状语从句 地点状语从句通常由where, wherever 引导。 Where I live there are plenty of trees. 我住的地方树很多。 Wherever I am I will be thinking of you. 不管我在哪里我都会想到你。（二）地点状语从句 地点状语从句通常由where, wherever 引导。 Where I live there are plenty of trees. 我住的地方树很多。 Wherever I am I will be thinking of you. 不管我在哪里我都会想到你。 （二）方式状语从句 方式状语从句通常由as, (just) as…so…, as if, as though引导。1） as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体，例如： Always do to the others as you would be done by. 你希望人家怎样待你，你就要怎样待人。 As water is to fish, so air is to man. 我们离不开空气，犹如鱼儿离不开水。 Just as we sweep our rooms, so we should sweep backward ideas from our minds. 正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。2） as if, as though 两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作"仿佛……似的"，"好像……似的"，例如： They completely ignore these facts as if (as though) they never existed. 他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。） He looks as if (as though) he had been hit by lighting. 他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。） It looks as if the weather may pick up very soon.看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。） 说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，例如： He stared at me as if seeing me for first time.他目不转睛地看着我，就像第一次看见我似的。 He cleared his throat as if to say something.他清了清嗓子，像要说什么似的。 The waves dashed on the rocks as if in anger.波涛冲击着岩石，好像很愤怒。（三）原因状语从句 比较：because, since, as和for 1） because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。 I didn't go, because I was afraid. Since /As the weather is so bad, we have to delay our journey.2） 由because引导的从句如果放在句末，且前面有逗 号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。 He is absent today, because / for he is ill. He must be ill, for he is absent today.（四）目的状语从句 表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导，例如： You must speak louder so that /in order that you can be heard by all. He wrote the name down for fear that(lest) he should forget it. Better take more clothes in case the weather is cold.（五）结果状语从句 结果状语从句常由so… that 或 such…that引导，掌握这两个句型，首先要了解so 和 such与其后的词的搭配规律。比较：so和 such 其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so 是副词，只能修饰形容词或副词。 so 还可与表示数量的形容词many, few,
英语各种从句如下：
1、前四类由于主语从句、表语从句、宾语从句及同位语从句在句子的功用相当于名词，所以通称名词性从句；定语从句功能相当于形容词，称为形容词性从句；而状语从句功能相当于副词，称为副词性从句。
2、句子成分通常都是单词,这样的句子叫简单句。如果句子里用另外一个句子做句子成分，那就是一个复杂句，而做成分的句子就叫做从句。比如一个句子做主语，那么就叫主语从句，比如一个句子做宾语，那么就叫宾语从句，比如一个句子做定语，那么就叫定语从句，比如一个句子做状语，那么就叫状语从句，比如一个句子做表语，那么就叫表语从句。
3、引导条件状语从句的从属连词主要有if，unless，as，so，long as，in case也可引导条件状语从句，其意为“如果”、“万一”。引导时间状语从句的从属连词很多，常见的有before，after，when，while，as，ince，till，until，as soon as等。
英语中六大从句的用法总结
根据从句语法功能的不同可分为：主语从句、表语从句、宾语从句、同位语从句、定语从句和状语从句6类。
1、主语从句
主语从句就是作主语的从句。它的连接词有连词、连接副词、连词代词。主语从句放在句首时，句子显得很笨重，因此常用it作形式主语，而将真正的主语后置，比如：
It is a pity that you have missed such a wonderful concert.
真遗憾你错过了这么精彩的一场音乐会。
2、表语从句
表语从句就是作表语的从句。它的连接词有连词、连接副词、连词代词等。
比如：
My idea is that we meet at the bus stop.
我的想法是我们在公共汽车站会面。
3、宾语从句
宾语从句就是作宾语的从句。它的连接词有连词、连接副词、连词代词等。
比如：
She said that she would drop maths.
她说她要放弃数学。
4、同位语从句
同位语从句就是作同位语的从句，它的连接词有连词、连接副词等。
The fact that everyone loves beauty is common sense.
人人爱美是常识。
5、定语从句
定语从句就是作定语的从句。定语从句主要修饰、限定、描绘名词，有时修饰代词，放所修饰词后边。
比如：
The girl who wears a new dress is my daughter.
那个穿新衣服的女孩是我的女儿。
6、状语从句
状语从句就是作状语的从句。在复合句中修饰主句中的谓语动词、形容词或副词，起状语作用的从句叫作状语从句。
比如：
Soon after he jumps his parachute will open.
他跳伞之后，降落伞就会打开。
类型与用法总结如下：
一、定语从句：
在复合句中， 修饰名词或代词的从句叫定语从句，被修饰的名词或代词叫先行词，引导定语从句的有关系代词who，whom，whose，which，that等和关系副词where，when，why等，关系代词和关系副词在定语从句中担任句子成分。
二、状语从句：
表示“当…时候”的while, when, as的用法区别是：while从句中的谓语动词必须是延续性动词；表示带有规律性的“每当”或当主、从句谓语动词的动作发生有先后时，只能用when；当表示“一边…一边…”或“随着”时，只能用as。另外，用于此义的as所引导的时间状语从句谓语只能是动作动词，不能是状态动词。
三、名词性从句：
在句子中起名词作用的句子叫名词从句(NounClauses）。名词从句的功能相当于名词词组,它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
相关内容：
同位语从句：同位语从句是名词性从句中的主要从句之一，从句作同位语表示与之同位的名词(短语)的实际内容，它的作用相当于名词，对前面的名词(短语)加以补充说明或进一步解释，相当于一个表语从句，它们之间的关系就是同位关系，即主表关系。
定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。This is the reason why he refused to help us. 这就是他拒绝帮助我们的原因。
时间状语从句：用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。连接时间状语从句的连接词有：when, before, after, while, as soon as, until, since. We were about to leave when he came in. 我们就要离开，就在那时他进来了。
英语中六大从句用法总结
1.定语从句
定语从句所修饰的先行词可以是名词或代词，也可以是一个句子。定语从句通常位于先行词之后，由关系代词或关系副词引导。
*限制性定语从句
限制性定语从句修饰先行词，对先行词起修饰作用，紧接先行词之后，无逗号，若省去，原句意思不完整。引导定语从句的关系代词有who,whom,whose,which,that等。who,whom,whose用于指人，whose有时也可指物，相当于of which；which用于指物；that既可指人也可指物，但只用于限制性定语从句中。关系代词除了引导定语从句，替代先行词外，还在从句中担任主语、宾语、定语等。
The computers and cables which make up the Internet are owned by people and organizations.
Those who live alone or who are sick may have trouble in getting close to other people.
The girl whose parents died in an accident is living with her grandmother.
1)当先行词是all,anything,everything,something,nothing等不定代词或先行词前有first,last,any,few,much,some,no,only以及形容词最高级修饰时，只能用关系代词that引导从句。
That is all that I've heard from him.
He's the first person that I'm going to interview this afternoon.
2)关系代词的省略
在从句中作宾语的关系代词常可省略。关系代词紧跟介词，作介词宾语时不可用that，只可用which或whom引导从句，并且不可省略，但当介词位于宾语从句句末时，作为介词宾语的关系代词仍可用that，也可省略。
This is one of those things with which we have to put up.
This is one of those things (which\that) we have to put up with.
3)引导定语从句的关系副词有when,where,why等。关系副词在从句中作状语，意义上相当于一个“介词+which”的结构。
Even in comic books where(=in which) there are no words,the stories are fully expressed through the drawings.
No one knows the reason why(=for which) he was so angry that day.
*非限制性定语从句
非限制性定语从句既可修饰先行词，也可修饰整个主句，起补充说明作用，与主句之间有逗号隔开，若省去，原句意思不受影响。不可用that引导非限制性定语从句。关系词不可省略。
Every object has a gravitational pull,which is rather like magnetism.
*“介词+which\whom\whose”引导的定语从句
“介词+which\whom\whose”可引导限制性定语从句，也可引导非限制性定语从句，该结构中介词的选择取决于从句谓语动词的固定搭配，或先行词的习惯搭配。
This is the computer on which he spent all his savings
It is written by a person with whom we are all familiar.
*as引导的定语从句
as引导的定语从句主要用于“such...as”及“the same...as”的结构中，代替先行词是人或物的名词。as引导非限制性定语从句时，代替整个主句，从句可位于主句之前、之后或中间。
These are not such problems as can be easily solved.(as代替先行词problems)
As is mentioned above,no single company or group can control what happens on the Internet.(as代替主语)
2.主语从句
1）主语从句可直接位于主语的位置，如果从句较长，谓语又较短，可用it作形式主语，而将从句放在句末。常见的句型有：
*It is a fact\a pity\a question\good news that...
*It seems\appears\happened\has turned out that...
*It is clear\important\likely\possible that...
*It is said\reported\estimated\has been proved that...
It is said that comic books create a connection between people of the same generation.
It seems that the performance is very useful.
2)what引导的主语从句表示“...的东西时”，一般不用it作形式主语。
What we lack is experience.
3)what,who,when,why,whether等词含有各自的疑问意义，但它们引导的主语从句，都用陈述语序。
How the plan is to be carried out should be discussed again.
I did know why I felt like crying.
3.宾语从句
1）宾语从句可位于及物动词、介词和某些形容词后。连词that常可省略。介词后一般接疑问词引导的宾语从句。in that(因为),except that(除了),but that(只是）已构成固定搭配，其他介词后一般不接that引导的宾语从句。
*I promised that I would change the situation.
*All this is different from what American young people would say about friendship.
*He is certain that watching so much television is not good for children.
*This article is well-written except that it is a bit too long.
2）关于宾语从句连词的选择：
① 若从句来源于一个陈述句,那么,连词用that,在口语中that可以省略;
② 若从句来源于一个一般疑问句,连词则用if 或whether;
③ 若从句来源于一个特殊疑问句,则连词就是疑问词(如 what,who,where,when等)
*They believe that the computer will finally take the place of human beings.(他们相信计算机终将代替人类。) (从句本来就是陈述句)
* I wonder whether I should say something for him to the headmaster. (我不知道是不是该为他在校长跟前说点什么。) (从句来源于一般问句Shall I say something for him to the headmaster?)
*He asked me where he could get such medicine. (他问我在哪儿能搞到那样的药。) (从句来源于特殊问句Where can he get such medicine? )
3)宾语从句后如有宾补，要用形式宾语it来代替，而把宾语从句移至宾补之后。
He has made it clear that he would not change his mind.
4)在think,believe,suppose,expect等动词后的宾语从句中，如果谓语是否定的，一般将否定词移至主句谓语上，宾语从句则变成肯定形式。
He didn't think that the money was well spent.
4.表语从句
在句子中作连系动词的表语的从句,它位于主句中的系动词之后。表语从句出现在结构为“主语+系动词+表语从句”的句子中。表语从句除可用that,what,when,why,whether,how等引导外，还可由because,as if(though)等引导。that常可省略。如主句主语为reason,只能用that引导表语从句，不可用because.
*Perhaps the most important thing to remember is that there is no one common type of life in America.
*The reason why so many people died there is that there were not enough food supplies.
*It looks as if successful international cultural communication will make the world smaller.
5.同位语从句
同位语从句用于对前面出现的名词作进一步说明，一般用连词that引导，由于先行名词的意义不同，也可用whether,who,when,where,what,why,how等引导。常见的先行词有fact,idea,belief,news,hope,conclusion,evidence,suggestion,order,problem,report,decision.有时由于谓语较短，将同位语从句位于谓语之后。
She finally made the decision that she would join the fashion show.
I had no idea how many books I could borrow at a time.
The news came that their team had won the championship.
6.状语从句
*时间状语从句
引导时间状语从句的从属连词和词组有：
1）when,whenever,while,as,after,before,since,till,until,once等。
We have learnt quite a lot about it since we came here.
2)as soon as,hardly(scarcely)...when,no sooner...than,each(every) time,the moment,immediately(that)等。
As soon as I sent an e-mail message,I received positive responses.
The moment he heard the good news,he jumped with joy.
*地点状语从句
引导地点状语从句的连词是where,wherever.
Wherever she went,she took her little daughter with her.
*原因、结果和目的状语从句
1）引导原因状语从句的从属连词有：because,as,since,now(that),seeing that,considering that,in that等。
Considering that he is a freshman,we must say he is doing well.
2)引导结果状语从句的连词有：so...that,such...that
,so that,that,so等。
Mickey Mouse is so attractive that the children are reluctant to leave.
3)引导目的状语从句的连词有：so that,in order that,for fear that,lest等，从句常使用may,might,can,could,would等情态动词。
We got up early this morning so that we could catch the first bus to the railway station.
*条件和让步状语从句
1）引导条件状语从句的连词和词组有if,unless,as(so) long as,on condition that,in case,provided(providing) that,supposing等。
As long as you have the right equipment,you can use a telephone line to transmit computer data.
2)引导让步状语从句的连词和词组有though,although,whether,even though,even if,no matter what(when,how...),whatever(whenever,wherever,however....)等。though,even if等引导状语从句可转换成含有as的部分倒装结构，具有强调意义。其结构为“形容词（副词、动词、名词）+as+主语+谓语”。
No matter what you may say,I would not change my mind.
Young as he is,he is quite experienced in this work.(=though he is young)
Child as he is,he can speak English fluently.(=though he is a child)
*方式状语从句
引导方式状语从句的连词有as,just as,as if,as though等。as if,as though引导的状语从句中，谓语动词常用虚拟语气，表示与事实相反。
The young man made the experiment just as the teacher had taught him.
Everything went on as usual as if nothing had happened.
英语从句类型与用法：
一、时间状语从句
1、引导时间状语从句的从属连词很多，常见的有before, after, when, while, as, since, till, until, as soon as等。
2、表示“当…时候”的while, when, as的用法区别是：while从句中的谓语动词必须是延续性动词；表示带有规律性的“每当”或当主、从句谓语动词的动作发生有先后时，只能用when；当表示“一边…一边…”或“随着”时，只能用as。另外，用于此义的as所引导的时间状语从句谓语只能是动作动词，不能是状态动词。
3、until在肯定句中通常只连用延续性动词，表示相应动作结束的时间；在否定句中通常连用非延续性动词，表示相应动作开始的时间，意为“直到…才”。
4、表示“一…就”除用as soon as外，还可用the minute, the second, the instant, immediately, directly, instantly, no sooner…than, hardly…when等。
5、every time, each time, (the) next time, (the) last time, by the time, the first time, any time等以time结尾的词语也可用作连词，引导时间状语从句。
二、条件状语从句
1、引导条件状语从句的从属连词主要有if, unless, as long as等。
2、in case也可引导条件状语从句，其意为“如果”、“万一”。
三、让步状语从句
1、引导让步状语从句的从属连词主要有although, though, however (=no matter how), even if(即使），whether…or(不论…还是）等连词。
2、as也可引导让步状语从句，但要将名词、形容词或副词等提到as前，若提前的是单数可数名词，要省略a / an。
3、连词while有时也可表示“尽管”、“虽然”，引导让步状语从句。
4、whatever, whoever, however, whenever, wherever等引导让步状语从句。
注：表示“虽然”的though, although不可与but连用，但可与yet, still连用。
四、原因状语从句
1、引导原因状语从句的从属连词主要有because, as, since, seeing (that), now (that)等。
2、除以上提到的大家比较熟悉的引导原因状语从句的从属连词外，when有时也可引导原因状语从句，其意“既然”。
3、有关原因状语从句还应注意以下几点：
(1) as与since, now that一样表示双方都知道的原因，通常位于主句前，且均不可用于强调结构被强调。
(2)当表示直接的因果关系，回答why时，或有only, just, all, partly, not, but等副词修饰时，或用在强调结构中都只能用because。
(3) for有时也可引出表示原因的分句，但它只能位于后面，对前一分句加以解释或推断。
(4)不要受汉语意思影响将表示“因为”的连词与表示“所以”的so连用。
五、地点状语从句
1、引导地点状语从句的从属连词主要有where (在哪里），wherever(无论什么地方），everywhere(每个地方），anywhere(任何地方）。
2、有的同学认为地点状语从句在平时见得不多，误认为考试不会涉及，但恰恰相反，地点状语从句却是英语考试经常考查的一个知识点。
六、目的状语从句
1、引导目的状语从句的从属连词主要有in order that, so that, in case, for fear等。
2、引导目的状语从句的so that有时可省so或that，即单独用so或that来引导目的状语从句。
七、结果状语从句
引导结果状语从句的从属连词主要有so that, so that, such that等。
