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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。
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。
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.概念名词性从句共有四种:主语从句,表语从句,宾语从句和同位语从句1．主语从句：主语从句在整个句子中作主语。
(1)that不同于其它的连词，它不充当句子的成分，只是单纯的连接词，通常不可以省略。
从句置于句首时，绝对不可以省略。
That the driver could not control his war was obvious.It was obvious that the driver could not control his car.（形式主语it）(2)if 不能用在主语从句中，而是用whetherWhether he left (or not) is unknown(3)当主语从句作主语时，谓语动词一般用（dose），下面这个句型例外。
What we need is more time and money.What we need are many more books.（就近原则）2.表语从句：表语从句出现在系动词后，充当表语。
The trouble is that we are short of money.（不可省略）Go and get your coat. It’s where you left it.（陈述句语序）(1) 引导表语从句除了上述三类词外还有because, as if/ as though等等The reason (why/for which…..) is that ……It/This/That is because……(2) 连系动词“appear, look, seem”的两个常用句型It seems/appears that….It looks/seems as if/as though……(与事实相符用陈述语气，与事实相反用虚拟语气)It looked as if it was going to rain. 看起来天要下雨了。
(3) as 也可以引导表语从句Things are not always as they seem to be3. 宾语从句：及物动词，形容词和介词后加宾语从句作其宾语。
(1) 宾语从句时态与主句一致，但宾语从句表示的是客观真理或普遍现象除外The teacher told us that the earth moves around the sun(2) 连词whether和if可以互换，但注意下列情况注：连词后紧跟or not；作介词宾语；连接词后直接加不定式；仅能用whether1）I want to know whether or not they will come.2）He was interested in whether he saw her there.3）He doesn’t know whether to stay or not.如果宾语从句是否定时，一般用if引导I care if he will not attend the meeting.(3) 当宾语从句后带宾补时，要用“主语+谓语+it +宾补+that-clause,that不可省略I think it certain that she will do well in her exam.(4) 当主语是I, we ，主句用think, believe, suppose, expect, imagine五个动词时，用否定转移I don’t think he will win the game, will he?(5) that在宾语从句常可以省略，但由and或but连接两个或多个宾语从句时，仅可以省略第一个连词thatHe said (that) he had eaten nothing but that he wasn’t hungry.Everybody could see what happened and that Tom was frightened.(6)that引导的宾语从句作介词宾语时，that不能省略。
I know nothing about him except that he is from the south.(7)主句谓语动词与that从句之间有插入语，that不可省略。
We decided, in view of his special circumstances, that we would admit him for a probationary period. 鉴于他的特殊情况，我们决定应允他一段试用期。
4.同位语从句，在句中作某些名词的同位语，对前面的名词进一步说明。
用在下列名词fact,news,idea,hope,believe,hope,thought（想法）,doubt.truth,order（命令）,suggestion（建议；暗示）。
在一些表示“建议、劝说、命令”的名词后面的从句中，谓语动词用虚拟语气。
should+动词原形表示，should可省略。
如：My suggestion is that we (should) start early tomorrow. 我的建议是我们明天一早就出发。
(1) There is no doubt that he will come.There is doubt whether he will come.Word came that Napoleon would come to inspect them.There is no possibility that….(2) that引导的同位语从句与定语从句的区别：在同位语从句中：that不可以省略，不作成分;定语从句的关系代词that在定语从句作成分，作宾语时可以省略We are interested in the news that some foreigners would visit our school.We are interested in the news（that ）he told us.when, where引导的同位语从句与定语从句的区别：在定语从句中，when, where前有分别表示时间、地点的先行词；而在同位语从句中无此对应关系They have no idea at all where he has gone.(同位语从句)Go and get your coat. It’s in the place where you left it.(定语从句)5.疑问词-ever既可以引导名词性从句，也可以引导让步状语从句，而no matter+疑问词只能引导让步状语从句No matter where I go, my heart is towards China.I believer whatever he says. （？）Whatever he says, I will never believe him.who与whoever的区别who是“谁”的意思，表示具有疑问，whoever相当于anyone who“无论谁”Whoever leaves the room last ought to turn off the lights.Can you tell me who that gentleman is?6．当名词性从句缺少主语、宾语或表语时，引导词通常用what，它相当于。
（另外，有时具有感叹意义all that, anything that或the thing(s) that）What we can’t get seems better than what we have.Tom thought what a beautiful girl Mary was.7.注意区分it 作形式主语的主语从句与强调句强调句句型It is/was+被强调部分+that, 去掉It is/was, that，句子仍然成立。
It is natural that they should have different views. 主语从句It is only lately that he had had a family himself. 强调句What was it that he wanted? I don’t know what it was that he wanted.It was in the hotel where he stayed that we discussed the serious problem8.注意it 作形式主语的主语从句和as引导非限制性定语从句引导的不同It is known to all that the earth is round.As is known to all.the earth is round。
1. Ask her ______come with me.A. if she willB. if will sheC. whether will sheD. will she2. Can you tell me _____ the railway station?A. how can I get toB. how can I get toC. where I can get toD. where can I get to3. They have no idea at all ____.A. where he has goneB. where did he goC. which place has he goneD. where has he gone4.____leaves the room last ought to turn off the lights.A .Anyone B. The person C. Whoever D. Who5. These photos will show you ____.A. what does our village look likeB. what our village looks likeC. how does our village look likeD. how our village looks like6. Can you make sure ____ the gold ring/A. where Alice had putB. where had Alice putC. where Alice has putD. where has Alice put7. When and where to build the new factory _____ yet.A. is not decidedB. are not decidedC. has not decidedD. have not decided8. No one can be sure ____ in a million years.A. what man will look likeB. what will man look likeC. man will look like what9.____ the 2000 Olympic Games will be held in Beijing is not known yet.A. WheneverB. IfC. whetherD. That10.Go and get your coat. That is ____ you left itA. thereB. whereC. there whereD. where there11. It worried her a bit ____ her hair was turning grey.A. whileB. thatC. ifD. for12.____ he said at the meeting astonished everybody present.A. WhatB. ThatC. The factD. The matter13. I remember ____ this used to be a quite village.A. WhenB. howC. WhereD. What14.--- Do you remember _____ he came?----Yes, I do, he came by car.A. howB. whenC. thatD. if15.____ is a fact that English is being accept as an international language.A. ThereB. ThisC. ThatD. it1.a2.a3.a4.c5.b6.c7.a8.a9.c 10. b 11.b 12.a 13.a 14.a 15.d补充名词性从句资料：1．主语从句能用it作形式上的主语。
