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名词性从句讲解(最全版)名词性从句是一个从句，它在句子中充当名词的角色。
它可以作为主语、宾语、表语、同位语或介词宾语。
名词性从句通常由连接词引导，如that、whether、if、who、whom、whose、which、what等。
1. 作为主语：名词性从句可以作为主语，取代一个名词或名词短语，引导词通常为that或whether。
例如：- What you said is true.（你说的是真的。
）- Whether he will come is still uncertain.（他是否会来还不确定。
）2. 作为宾语：名词性从句可以作为及物动词或介词的宾语，引导词通常为that、whether、if、who、whom、whose、which、what等。
例如：- She asked me what I wanted.（她问我想要什么。
）- I don't know if/whether he will come.（我不知道他是否会来。
）3. 作为表语：名词性从句可以作为系动词的表语，引导词通常为that、whether、who、whom、whose、which、what等。
例如：- The problem is that she doesn't understand.（问题在于她不理解。
）- The question is who will take care of them.（问题是谁会照顾他们。
）4. 作为同位语：名词性从句可以作为同位语，解释或说明前面的名词或代词，引导词通常为that、whether、who、whom、whose、which、what等。
例如：- The fact that he lied surprised me.（他撒谎的事实让我感到惊讶。
）- His belief that she will succeed is unwavering.（他坚信她会成功。
语法专题二：名词性从句1. 名词性从句的基本概念：1) 主语从句：在句中充当主语；亦可用it作形式主语，主语从句置于句末。
2) 宾语从句：在句中充当及物动词或介词的宾语；亦可用it作形式宾语，宾语从句置于句末。
3) 表语从句：在句中充当系动词的表语。
4) 同位语从句：常置于fact, idea, news, promise, doubt, suggestion, possibility, belief等表示有内容的名词后，起解释、说明作用。
2. 注意：1) 名词性从句要用陈述句语序。
2) 名词性从句中缺少主语、表语、宾语时：常用what 导，亦可用which表示选择，用who/whom/whoever指人。
缺少状语：用where（表地点）, when（表时间）, how（表方式）, why（表原因）。
3) 如不缺成份：主语从句、同位语从句用that引导，不能省略；表从、单个动词宾从可省略引导词that；介词宾从、第二个宾从，引导词that一般不省略；it作形式主语或宾语时，引导实际主从或宾从，一般that不省略；当主从、宾从本身为复合句时，引导词that不省略。
如：He told us sadly that what he had done secretly was discovered by his parents.4) 含宾从的复合句中，主句和从句的时态保持一致，但如果从句中表示是客观现象，虽然主句是过去时态，从句仍用一般现在时。
5) 主语从句做主语，谓语动词用单数；如果由and 连接两个或两个以上的主语从句做主语时，谓语动词用复数；由两个或多个连接词引导一个主语从句，谓语动词用单数。
6) 当主句是I/We think（或suppose, expect, believe, imagine, guess）时，其后的宾语从句如果是否定的，常常把否定词not从从句中移到主句中。
7) 只能用whether，不能用if表示“是否”的情况如下：(1) 在表语从句和同位语从句中；(2) 在主语从句中，如果用it做形式主语，whether和if都能引导主语从句，否则，只能用whether(3) 在介词之后；(4) 后面直接跟动词不定式；(5) 与or not连用；(6) 引导让步状语从句，只能用whether。
名词性从句1.名词性从句的定义名词性从句是起名词作用的从句，这些从句可以作为一个整体来看，其作用就相当于一个名词，在复合句中作主语，宾语，表语和同位语。
名词性从句包括主语从句，表语从句，宾语从句，同位语从句四种。
2.名词性从句的连接词名词性从句通常由一个连接词和主句相连。
连接词很重要，它既是联系主句的纽带，又是从句的标志，通过连接词，我们可以辨认不同从句的性质。
一．从属连接词（在从句中不充当任何成分，只起到连接从句的功能）A．that 只是引导名词性从句，本身并没有实际意义，在从句中不充当任何句子成分。
That he will come to the meeting is certain.(主语从句)The fact remains that we are behind the other group.(同位语从句)B．if和whether具有“是否”的意义，但是whether比较正式，在口语中人们经常if, if 和whether在名词性从句中尽管不充当任何的成分，但不可以省略。
C．whether不能替代if的情况1.if只能引导宾语从句（做介词宾语的情况除外），而whether 可以引导所有的名词性从句。
She asked if/ whether that was enough.Whether the football match will be played depends on the whether.The question is whether we can arrive there on bus.2.whether引导宾语从句做介词的宾语，if没有这种用法It depends on whether it will be fine.3.whether后紧跟不定式He was wondering whether to go home.4.or not 可直接跟在whether后面，但不可以直接跟在if后面。
名词性从句的三种类型及例句解析名词性从句是指在一个句子中充当名词的从句。
它可以作主语、宾语、表语和同位语等，并能够起到连接子句与主句的作用。
在英语语法中，有三种主要类型的名词性从句：宾语从句、主语从句和表语从句。
本文将详细解析这三种类型，并举例说明其用法。
一、宾语从句宾语从句作为一个整体出现在主句中的动词后面，充当主句的宾语。
它常常引导由that、whether/if、wh-疑问词引导的从句。
下面是一些例句：1. 主句：He asked me a question.宾语从句：He asked me whether I had finished my homework.解析：宾语从句"whether I had finished my homework"作为动词"ask"的宾语，表达了一个疑问。
2. 主句：She doesn't know the answer.宾语从句：She doesn't know what the answer is.解析：宾语从句"what the answer is"作为动词"know"的宾语，表示对答案的不知道。
3. 主句：They wonder if he will come to the party.宾语从句：They wonder if/whether he will come to the party.解析：宾语从句"if/whether he will come to the party"作为动词"wonder"的宾语，表达了对他是否会来参加派对的疑问。
二、主语从句主语从句作为一个整体出现在句子的最前面，充当主句的主语。
它通常由that引导，也可以由wh-疑问词引导。
以下是一些例句：1. 主句：It is important to learn a foreign language.主语从句：That she is a hardworking student is important.解析：主语从句"That she is a hardworking student"作为句子的主语，强调了她是一个勤奋的学生的重要性。
名词性从句(包括主语、表语、宾语和同位语从句)1.陈述句作名词性从句, 用that引出, 虽然在从句里不充当成分, 但除宾语从句外, 在主语、表语和同位语从句中都不能省。
(在宾语从句中, 第一个that可省, 第二个that不能省)2.一般疑问句作名词性从句, 用whether引出, 除宾语从句(if / whether均可)。
3.特殊疑问句作名词性从句, 用who / whom / what / which / when / where / why / how 和whoever / whatever etc引出。
4.从句里要用陈述句的词序。
5.在名词性从句中, “无论谁”、“无论什么”, 只能用whoever/ whatever, 但在让步状语从句中, whoever / nomatter who, whatever / no matter what均可。
主语从句作主语的从句称主语从句, 一般放在句首, 也可用it作形式主语。
1.That Mary was late again made the teacher very angry. (that不能省)2.Whether he can pass the exam or not depends on how hard he works. (whether不能用if替代)3.What matters is not to win but to take part / participate. (What引出的主语从句常用is或was作谓语动词)4.Whatever is said here must be kept secret. (whatever不能用no matter what替代)5.It still remains a question whether they will go abroad for further study.It happened / seemed / never occurred to sb that…It is important / necessary that…It is said / believed / reported / well known that…It is a pity / no wonder / no longer a question that…表语从句作表语的从句称表语从句, 位于连系动词之后。
什么是名词性从句？名词性从句（Noun Clauses）是一个在句子中充当名词的从句。
它可以在句子中担任主语、宾语、表语或补语的角色。
名词性从句通常由连词引导，例如that, whether, if, who, whom, whose, what, which, when, where, why等。
以下是名词性从句在不同角色中的示例：1. 主语（Subject）：- What she said surprised me.（她所说的让我感到惊讶。
）- Whether we go or not is up to you.（我们去与否由你决定。
）2. 宾语（Object）：- I know that he is coming.（我知道他要来。
）- She asked me where I was going.（她问我要去哪里。
）3. 表语（Predicate）：- The problem is how to solve it.（问题是如何解决它。
）- His wish is that everyone gets along.（他的愿望是每个人和睦相处。
）4. 补语（Complement）：- The important thing is what you do next.（重要的是你接下来要做什么。
）- His goal is to become a doctor.（他的目标是成为一名医生。
）名词性从句的使用可以使句子更加丰富和灵活，它可以替代一个独立的名词，并在句子中承担相应的语法角色。
名词性从句可以用于各种不同的语境，包括陈述句、疑问句和感叹句等。
需要注意的是，名词性从句的引导词可以根据从句的具体内容和功能而有所不同。
因此，在使用名词性从句时，我们需要根据语境和句子的需要选择适当的引导词。
了解和掌握名词性从句的概念和用法，可以帮助我们在英语表达中更加灵活和准确地使用不同类型的从句。
名词性从句有哪些名词性从句共有四种，分别是主语从句（整个从句在主句中做主语），表语从句（整个从句在主句中做表语），同位语从句（整个从句在主句中做同位语），宾语从句四类（整个从句在主句中做宾语）。
名词性从句有哪些1、主语从句例如：It + be + 形容词/名词/动词过去分词 + that 从句It is strangethat he knows nothing about it.从句：He knows nothing about it.主句：It is strange something (= He knows nothing about it).连接词在从句中是否充当成分：否连接词是否可省：否2、宾语从句例如：that 引导的宾语从句I think that English is important.从句：English is important.主句：I think something (= English is important).连接词在从句中是否充当成分：否连接词是否可省：是3、表语从句用法和结构同宾语从句，区别在于：系动词后面所接的从句为表语从句，而及物动词后面所接的从句为宾语从句。
例如：- that 引导的表语从句The truth is that English is important.从句：English is important.主句：The truth is something (= that English is important).4、同位语从句同位语从句就是在复合句中作名词的同位语的名词性从句。
同位语从句对于名词进一步解释，说明名词的具体内容，一般由that引导，同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开。
名词性从句一．定义名词性从句是一种具有名词功能的从句。
包括主语从句，宾语从句，表语从句，同位语从句。
Eg: 1) <That we are invited to the concert this evening> is good news to us.————从句在主句中作主语（主语从句）。
2）Do you know <where he has gone>?————从句在主句中作宾语（宾语从句）。
3）This is <where our problem lies>.————从句在主句中作表语（表语从句）。
4) My question <how I shall get in touch with him> has not been answered.————从句在主句中作同位语（同位语从句）。
二．名词性从句的连接词连接代词：what; who; whom; whose; which连接词连接副词：where; when; why; how纯连词：that; whether; if★连接词的选择技巧：一看从句所缺成分；二看从句所缺意义☆按连接词在从句中的功能分类：1．作主语：who（谁），what(…的事情，…东西)2. 作宾（表）语：who(谁)，what（…的事情，…东西），whom(谁)3. 作定语：whose(谁的)，which(哪一个)4. 作状语：when(何时)，where(何地)，why(为什么)，how(怎样，如何)※ 1. 纯连词不做从句中的成分，that 无意义，whether, if 表―是否‖2. Which 可做从句中的定语，也可直接做主语或宾语(表语)Eg: 1) Do you know which bus I should take? (which 作定语)2）Which you choose depends on your need.(which作宾语)Eg: 1) I don’t know who will come to give the talk.(作主语)2) What I said referred to you.（作宾语）3) What surprised me most is that you had passed the exam.（作主语）4) Can you tell me who(whom) you were talking with.（作宾语）5) The teacher can not tell whose notebook it is.（作定语）6) We didn’t decide when we would set off.（作状语）7) Where I will have my dinner depends on money.（作状语）8) How she got the prize is known to all.（作状语）9) This is why she was late again.（作状语）三．注意事项1. 在名词性从句中，选项同时出现whether和if , 往往选whether1）if/whether 当―是否‖讲时，引导动词的宾语从句，两者可以通用，但介词后的宾从一般不用if。
Eg: I am not interested in whether he likes me or not.2)有些动词，如：leave, put, discuss后的宾语从句常用whether.Eg: We're discussing whether we should go to see the film tonight.3)与or not 连用时，常用whetherEg: I wonder whether I should go abroad or not.4)容易产生歧义的句子，常用whether引导宾语从句Eg: Let me know whether you can come.5)Whether引导的主从可放于句首，if引导的主从不可Eg：Whether we could move back is unknown.= It is unknown whether/if we could move back.6）If 只引导宾语从句2. it 可以作形式主语和形式宾语▲ it 作形式主语，常见的句型：1）It + be + 名词（名词词组）（a pity, a success, no wonder, an honor, no surprise…）Eg: It is no wonder that she will win.2)It + be + 形容词（important, certain, necessary, obvious, natural, clear, strange, possible, likely, probable, good, true, etc.）Eg: It is certain that he will pass the examination.※important, necessary, obvious, natural, strange后常加虚拟。
3)It + be + 过去分词（said, reported, expected, decided, known, suggested, supposed, required, demanded）Eg: It is said that we will have a meeting this afternoon.※suggested, supposed, required, demanded等表建议要求的词后加虚拟。
4）It + 及物动词/半系动词+ that (appear, seem, matter, remain, happen, etc.)Eg: It seems that it is going to rain.※用形式宾语it的情况：1）有宾语补足语时2）个别动词（hate, take, owe, have, see to…）带宾语从句时Eg：1)I think it necessary that we take plenty of water every day.2)Please see to it that the children go to bed by 9 o'clock.3. 不可以省略that的情况1）当一个动词带两个或两个以上的并列的that引导的宾从时，除第一个that外，其余的that不可省Eg：Our teacher said English was a beautiful language, and that we should learn it by heart.2）当宾语从句的主语是this，that或有this，that修饰时Eg: The teacher said that the word that I wrote on the blackboard was wrong.3）从句位于句首时that 不可省略Eg: That he will come to the conference makes us excited.4. 表语从句需注意的地方1）表语从句还可以用Because; as if; as though; as等引导Eg：It looks as if it is going to rain.2）主语为reason时，表从的连接词用that.3）若主句的主语为advice, suggestion, order, request, requirement .等名词时，表从的谓语动词常为虚拟语气―（should）+ 动词原形‖Eg: 1) The reason for the accident is that the driver was too careless.2) My suggestion is that we (should) finish our homework on time.注意：suggest表暗示，表明时不用虚拟Insist 表坚持自己的意见，为自己辩解时四．区分名词性从句与定语从句1. 找从句2. 忽略从句，看主句中缺什么成分①缺主，宾，表则很明显考察名词性从句②不缺则考察定语从句或同位语从句→同位语从句与定语从句的区别ⅰ从所修饰的名词方面：同位语从句修饰的名词通常是抽象名词，含某种信息的词，eg：news, fact, hope等定语从句修饰的词无特别要求ⅱ与主句中名词的关系：同位语从句用来解释说明名词所表示的具体内容定语从句修饰主句中的名词，说明名词的性质，特征，来源等ⅲ从连接词方面讲：同位语从句中纯连词that不作成分，连接代词有意义，连接副词前不需要与表时间，地点，原因的词搭配定语从句中关系代词that作成分，关系代词无意义，关系副词前常与表时间，地点，原因的名词搭配Eg：1）I heard a piece of news that a serious earthquake happened in Japan.2) I like the book that I bought yesterday.3) The fact that the earth is round is well-known. (that引导的同位语从句说明fact的内容)4) I lost the dog that was given by my sister. （that引导的定语从句修饰dog,表dog 的来源）5) I don't know the time when he will arrive at our school. （when引导的定从修饰表时间的名词time）6) I have no idea when he will arrive at our school. （when引导的同位语从句解释说明idea的内容，when前无表时间的名词）练一练（判断下列哪些题考察的是定语从句哪些考察的是名词性从句）：1.When I arrived, Bryan took me to see the house _____ I would be staying.A. whatB. whereC. whenD. which2. ——Have you finished the book?——No I’ve read up to ____the children discover the secret cave.A. whichB. whatC. thatD. where3. ——I prefer shutting myself in and listening to music all day on Sundays.——That’s ____ I don’t agree. You should have a more active life.A. whereB. howC. whenD. what名词性从句专项练习1.（2013新课标1）Police have found ____ appears to be the lost ancient statue.A. whichB. whereC. howD. what2.（2013江西卷）_______ one of you breaks the window will have to pay for it.A. WhoeverB. WhateverC. WhicheverD. Wherever.3.（2013重庆卷）______struck me most in the movie was the father’s deep love for his son.A.ThatB. ItC.WhatD. Which4.（2013山东卷）It’s good to know _____ the dogs will be well cared for while we’re away.A. whatB. whoseC. whichD. that5.（2013陕西卷）It remains to be seen the newly formed committee’s policy can be put intopractice. A. that B. which C. what D. whether6.（2013北京卷）makes the book so extraordinary is the creative imagination of the writer. A.That B. What C. Who D. Which7.（2013北京卷）Experts believe people can waste less food by shopping only when it is necessary.A. whyB. whereC. thatD. what8. (2013浙江卷)The only way to succeed at the highest level is to have total belief _____ you are betterthan anyone else on the sports field.A. howB. thatC. whichD. whether9. (2013四川卷) you said at the meeting describes a bright future for the company.A. WhenB. HowC. WhatD. That10.（2013天津卷）I want to tell you is the deep love and respect I have for my parents.A. ThatB. WhichC. WhetherD. What11.（2013湖南卷）Do not let any failures discourage you, for you can never tell _____ close you may beto victory. A. how B. that C. which D. where12【2012安徽】27. The limits of a person’s intelligence, generally speaking, are fixed at birth, but ________he reaches these limits will depend on his environment.A. whereB. whetherC. thatD. why13【2012重庆】34. Evidence has been found through years of study______ children’s early sleeping problems are likely to continue when they grow up.A. whyB. howC. whetherD. that14【2012全国】24. It is by no means clear the president can do to end the strike.A. howB. whichC. thatD. what15【2012北京】24. Jerry did not regret giving the comment but felt ______ he could have expressed it differently.A. whyB. howC. thatD. whether16【2012福建】35. We promise _____ attends the party a chance to have a photo taken with the movie star.A. whoB. whomC. whoeverD. whomever17【2012陕西】20. As many as five courses are provided, and you are free to choose _____ suits you best.A. whateverB. whicheverC. wheneverD. wherever18【2012山东】25. It doesn’t matter _____ you pay by cash or credit card in this store.A. howB. whetherC. whatD. why19【2012湖南】26. Everyone in the village is very friendly. It doesn’t matter ___ you have lived there for a short or a long time.A. whyB. howC. whetherD. when20【2012天津】9. It doesn’t matter ____ you turn right or left at the crossing—both roads lead to the park.A. whetherB. howC. ifD. when21【2012江西】25. It suddenly occurred to him ___ he had left his keys in the office.A. whetherB. whereC. whichD. that22【2012辽宁】34. The newcomer went to the library the other day and searched for _____ he could find about Mark Twain.A. whereverB. howeverC. whateverD. whichever23【2012四川】17. Scientists study ____ human brains work to make computers.A. whenB. howC. thatD. whether24【2012浙江】4. I made a promise to myself ____ this year, my first year in high school, would be different.A. whetherB. whatC. thatD. how25【2012江苏】27. The notice came around two in the afternoon _____ the meeting would be postponed.A. whenB. thatC. whetherD. how2011北京卷22__________ Barbara Jones offers to her fans is honesty and happiness.A. WhichB. WhatC. ThatD. Whom2011北京卷31The shocking news mad me realize ________ terrible problems we would face.A. whatB. howC. thatD. why2011上海卷35There is clear evidence _____ the most difficult feeling of all to interpret is bodily pain.A. whatB. ifC. howD. that2011上海卷38The message you intend to convey through words may be the exact opposite of _____ others actually understand.A. whyB. thatC. whichD. what2011山东卷26I am afraid he’s more of a talker than a doer, which is ______ he never finishes anything.A. thatB. whenC. whereD. why2011山东卷33We’ve offered her the job, but I don’t know______ she’ll accept it.A. whereB. what . whether D. which2011江西卷26.The villagers have already known ______ we’ll do is to rebuild the bridge.A. thisB. thatC. whatD. which2011江苏卷26It was never clear _______ the man hadn’t reported the accident sooner.A. thatB. howC. whenD. why2011安徽卷33His writing is so confusing that it’s difficult to make out _____it is he is trying to express.A. thatB. howC. whoD. what2011四川卷10Our teachers always tell us to believe in ________ we do and who we are if we want to succeed.A. whyB. howC. whatD. which2011辽宁卷23Twenty students want to attend the class that aims to teach ______ to read first.A. whatB. who . how D. why2011辽宁卷32When the news came _____ the war broke out, he decided, to serve in the army.A. sinceB. whichC. thatD. because2011天津卷13Modern science has given clear evidence ______ smoking can lead to many diseases.A. whatB. whichC. thatD. where2011陕西卷15I’d like to start my own business–that’s ____ I’d do if I had the money.A. whyB. whenC. whichD. what2011重庆卷22It is still under discussion __________the old bus station should be replaced with amodern hotel or not.A. whetherB. whenC. whichD. where2011重庆卷34It is not always easy for the public to see _______ use a new invention can be of to human life.A. whoseB. whatC. whichD. that2011湖南卷)31Before a problem can be solved, it must be obvious ______the problem itself is.A. whatB. thatC. whichD. why。
