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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。
名词性从句在复合句中起名词作用的从句叫做名词性从句。
它包括主语从句、宾语从句、表语从句和同位语从句。
名词性从句是中学阶段的一个重要语法项目，在历年的高考中几乎都涉及到，并且每年的命题各有变化。
一、名词性从句主语从句、表语从句、宾语从句、同位语从句，在整个句子中所起的作用，相当于一个名词。
因此，这四种从句通称为名词性从句。
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, why1.主语从句作句子主语的从句叫主语从句。
主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，whoever以及连接副词how，when，Where, why等词引导。
that在句中无词义，只起连接作用；连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。
例如：What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。
有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下：（1）It + be + 名词+ that从句（2）It + be + 形容词+ that从句（3）It + be + 动词的过去分词+ that从句（4）It + 不及物动词+ that 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”常用的句型有：It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that主语从句的例句：That he was won the prize is true.It is true that he has won the prize.What he said at the meeting is right,Whether he will come or not is unknown.Whoever comes will be welcome. Why he did it is not quite clear.2. 宾语从句名词句用作宾语的从句叫宾语从句。
名词性从句一.概念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。
二.语序所有名词性从句都是引导词(在最前)+陈述句语序(即:主语在前,谓语在后.即使从句表达的是疑问含义).What we can't get seems better than what we have.The photographs will show you what our village looks like.He asked how much I paid for the violin.三.引导词引导名词性从句的引导词类别词义在从句中的作用从属连词that无任何词义仅起连接作用，在从句中不充当任何句子成分从属连词whether和if(是否)意为“是否”，表明从句意义的不确定性起连接作用，在从句中不充当任何句子成分关系代词who, whom, what,which,whose,whoever, whomever, whatever, whichever 有各自自身的意义起连接作用，并在从句中充当主、表、宾、定语等关系副词when, where, why, how, however, whenever, wherever 有各自自身的意义起连接作用，并在从句中充当状语注意:名词性从句引导词,只有that在引导主语从句后置时,以及在引导宾语从句时有时可以省.其它情况下,以及其它名词性从句引导词均不能省.注意:只有在引导宾语从句(有些情况下不能用if代替whether)以及whether引导主语从句后置时才可用if.其它情况下,以及引导其它名词性从句时均不能用if.四.分类详解主语从句在句子中作主语的句子叫主语从句.1.由从属连词that, whether引导的主语从句：▲that引导主语从句放在句首时,that不可省.That light travels in straight line is known to all. (that不能省)That he will succeed is certain. (that不能省)That he is still alive is a wonder. (that不能省)That the baby could speak made his parents very happy. (that不能省)That she became an artist may have been due to her father’s influence. (that不能省)______ you don’t like him is none of my business.(1992上海高考试题)A. WhatB. WhoC. ThatD. WhetherAnswer：C▲whether引导的主语从句一般位于句首.也可用it作形式主语,将其后置,此时whether可换为if. (if引导主语从句时,只能用it作形式主语,放在句首,而将if引导的主语从句放到句末.) Whether she will come or not is still a question.Whether the old couple enjoy the trip remains to be proved.Whether we will hold a party in the open air tomorrow depends on the weather.It was a problem whether they would support us.It remains to be seen whether it will do us harm or good.It is uncertain if he will leave for Beijing tomorrow.2.由关系代词who/whoever; whom/whomever(少); what/whatever; which/whichever; whose 引导的主语从句.Who will the win the scholarship is unknown.Who will be sent abroad to further his studies is not announced.Who murdered the present is being investigated.Whoever comes is welcome.Whoever leaves the room last ought to turn off the lightsWhoever breaks the rule must be punishedWhoever breaks this law deserves a fine.Whoever wants to see this film can go with us tonight.Whoever helped to save the drowning girl is worth praising.Who/whom he will work with is still a secret.Whom we must study for is a question of great importance.Whoever you fell in love with has nothing to do with me.whoever既用作主格也用作宾语(作宾语时不宜用whomever，因为在现代英语中whomever 已几乎不用).What you have done might do harm to other people.What must be done has been done.What is worth doing is worth doing well.What you said just now hurt her feelings.What impressed me most was his great responsibility for his work.What was once regarded as impossible has now become a reality．What surprised me most was that such a little girl could play the violin so well.Whatever the parents do is for their children.Whatever you say is of no use now.Whatever was said here must be kept secret.Which school will win the prize is not known.I read it in some book or other, does it matter which it was?Whichever you take will be yours.Whichever book you choose doesn’t matter to me.Whichever of us gets home first starts cooking.Whose relatives lost their life in the shocking earthquake hasn’t been announced.3.由关系副词when; where; why; how引导的主语从句.When the plane is to take off hasn’t been announced.Where the heroine went is not mentioned at the end of the story.Where the English evening will be held is still under discussion.Why he often comes here is known to us all.Why he didn't come here is not clear to anyone.Why the sun in the morning looks bigger than the sun at noon is very interesting.How he was successful is still a puzzle.How he managed to finish the composition in such a short time is still a mystery.How and why Einstein had come to Princeton, New Jersey is a story of struggle, success, and sadness.How much water is flowing can be measured easily. 水的流量是多少……主语从句的主谓一致问题①:单个的主语从句作主语,谓语动词用单数;如果两个或两个以上的主语从句作主语,谓语动词用复数.When and where he was born hasn’t been found.How and why he came to the lonely small island is still a mystery.When the person was murdered and why he was murdered are still unknown.When they will start and where they go have not been decided yet.②:what引导的主语从句,谓语动词可由表语来决定.What we need are women workers.What we need is more time and money.4.it作形式主语引导主语从句如果主语从句太长,为避免句子结构头重脚轻,我们可用it作形式主语,而把主语从句放在主句谓语部分之后.这样句子结构就更加平衡.此时主语从句的引导词一般是that(一般不省,亦可省略),也可以是其它引导词.▲It + be +形容词+ that-从句It’s(im)possible/probable/important/necessary/fortunate/certain/clear/obvious/likely/natural/ strange that…It is probable that he told her everything.It's strange that he didn't come yesterday.It is likely that there will be a storm tomorrow.主语从句中的虚拟语气:其中在it’s natural/important/ necessary/strange that…结构中,主语从句常用should +do的虚拟语气(美语中省去should).It was necessary that we (should) make everything ready ahead of time.It is important that every pupil (should) be able to understand the rule of school.It is natural that she should do so.It is essential that these application forms be sent back as early as possible.It is necessary that a college student ____at least a foreign language．（上海1993）A. mastersB. should masterC. masteredD. will masterAnswer：B▲It + be +名词+ that-从句It’s a pity/a shame/an honor/a fact/a surprise/a question/good news/no wonder/ common knowledge/high time that…It is a pity that you didn’t attend the lecture yesterday.It is a pity that she has made such a mistake.It’s no wonder that you’ve achieved so much progress.主语从句中的虚拟语气:其中在此结构中若为surprise, a pity, a shame, no wonder等表示惊奇、惋惜的名词时,主语从句常用should +do的虚拟语气(美语中省去should).若为advice, desire, demand, order, proposal, recommendation, requirement, suggestion等表示建议、请求、要求、命令等名词时,须用should +do的虚拟语气(美语中省去should).It is my proposal that he be sent to study further abroad.It’s a pity that I (should) miss the lecture.▲It + be + -ed 分词+ that-从句It’s said/reported/believed/thought/announced/decided/known to all /must be pointed out/must be admitted that…It is reported that the number of wild animals in Africa is decreasing.It’s announced that the hostages have been released.It’s decided that the meeting has been put off till next Monday.It’s known to us how he became a writer.其中在此结构中若为request, demand, require, beg, propose, suggest, recommend, advise, order, command, urge, desire等表示建议、请求、要求、命令等的动词,则主语从句中须用should +do的虚拟语气(美语中省去should).It is required that nobody (should) smoke here.It is desired that we（should）get everything ready this evening.It is suggested that we (should) hold a meeting next week.▲It +不及物动词+ that-分句It seems/appears/happens (to sb)/occurred to sb/turned out/doesn’t matter /make no difference that…It seems to me that you object the plan.It happened to me that I had been out when he called.It occurred to me that I forgot to shut the windows.It doesn’t matter whether he likes or not.It makes no difference that you will go today or tomorrow.常将seem, appear 等后的从句的否定转移到前面。
