名词性从句
名词性从句讲解(最全版)
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
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三、宾语从句
在句中充当及物动词或介词宾语的句子叫做 宾语从句。 我不知道你会来这里。 I don’t know （that） you will come here.
三、宾语从句
1、用作及物动词的宾语 (1) They pretended that they were reading in the room. (2) I didn’t know what they were talking about.
以it作形式主语，把主语从句后置的常 用句型有：
1. It+be+形容词+that从句
It is/was certain that – clause
clear
important necessary probable possible
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（1）It is certain that she will do
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一、主语从句
在句中充当主语的从句叫做主语从句。 他星期三来这里是肯定的。
That he will come here on Wednesday is certain.
注意：从句作主语时，就算是句子意思完整，都 要加上从属连词that, 而且that不能省略,不充当 成分仅起连接作用。 他星期三是否来这里还不肯定。 Whether he will come here on Wednesday is not certain. 注意：主语从句表示“是否” 只用 “whether” 而不用“if”
well in her exam.
（2） It is probable that he told her everything.
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名词性从句
语序：陈述语序
在句中充当主语的从句称为主语 从句。英语中主语从句的句型可分 为两大类： 直接将主语从句放在主语位置上； 用it作形式主语，将真正的主语从 句后移，放在其他成分后。
让我们先说说第一类吧！
一、连接词（只起连接作用，在从句中不充当句子成分）
that：无词义。 e.g.: 他赢得比赛一事在我国引起巨大轰动。 That he won the game made a tremendous stir in our country. whether：“是否”。可单独使用，也可与or或or not连用。 e.g.: 我们明天是否能去春游取决于天气。 Whether we can go for a spring outing depends on the weather. 他们是否会来还未告诉我们。 Whether they will come has not been told to us.
四、主语从句与主谓一致
一个从句作主语时，谓语动词通常用单数形式， 特别是用it作形式主语的句型。 e.g.: Whether this kind of chemicals is better has not been tried.
当what引导主从，应遵循意义一致原则，谓语动 词选用相应形式。表语是复数时，谓语动词用复数 形式。 e.g.: What we do willingly is easy. What they were searching for were the missing gems.
Introduction
名词性从句：包括四种：主语从句、表语从句、宾语从
句、同位语从句。
连词：引导名词性从句的连词有以下三类
连接词：只起连接作用，在从句中不充当句子成分； 连接代词：连接主从句，并在从句中作主语/宾语/表 语/定语； 连接副词：连接主从句，并在从句中作时状/地状/原 因状/方式状。
名词性从句完整版
注意事项：that在从句中不可省略的情况有：宾语从句中引导词that省略；主语从句中引导词that不可省略；表语从句中引导词that不可省略。
例子：I think (that) you are right. 宾语从句中引导词that省略。
虚拟语气的时态：与现在事实相反，从句和主句的时态均为一般过去时
虚拟语气的使用场合：在某些从句中，如条件状语从句、让步状语从句等
与过去事实相反的情况
虚拟语气的形式：与过去事实相反，从句使用“had+过去分词”，主句使用“would+have+过去分词”
虚拟语气的使用：表示与过去事实相反的假设情况，常用于表达遗憾、后悔等情感
例子：When he comes, we will have a party. (时间状语从句)
宾语从句
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特点：在句子中句叫做宾语从句。
种类：陈述句、一般疑问句、特殊疑问句和祈使句。
连接词：that、if、whether等。
汇报人：XX
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虚拟语气的例子：If I had known the answer, I would have told you.（如果我早知道答案，我早就告诉你了。）
与真实情况的比较：与真实情况相比较，虚拟语气表达的是与过去事实相反的情况，而不是真实发生的情况
与将来事实相反的情况
虚拟语气的形式：与将来事实相反，从句使用“if+主语+were/did+动词原形”，主句使用“would+动词原形”
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名词性从句的特殊用法
从句中的省略现象
名词性从句
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
表语从句( the Predicative Clause ) The question is who can do the experiment. The reason for his lateness was that he got up late. China is no longer what she used to be.
连接词 ( Conjunctions )
that, whether/if（只用于宾语从句）, as if （只用于表语从句） 连接代词( Conjunctive pronouns )
who, which, what, whose(宾语从句)
连接副词( Conjunctive adverbs )
when, where, how, why
B (4) These photographs will show you ______. A. what does our village look like B. what our village looks like C. how does our village look like D. how our village looks like A (5) _____ he said at the meeting astonished everybody present. A. What B. That C. The fact D. The matter D for the violin. (6) He asked _____ A. did I pay how much B. I paid how much C. how much did I pay D. how much I paid
பைடு நூலகம்
主语从句( the Subject Clause ) Whether we will visit the Great Wall tomorrow has not been decided. That he will come is certain. It is certain that he will come. How this happened is still a question. What he said at the meeting is important.
名词性从句
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。
名词性从句完整版
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。
名词性从句
D.引导同位语从句时,切不可错用which。例如:
Word has come that some American guests will come to visit our school next week. 有消息说下周将有一些美国客人来我校参观。
____ you have seen both fighters, ____ will win?
A. Since; do you think who B. As; who you think
C. When; whoever D. Since; who do you think
解析：根据上面的讲解，不难知道答案是D。其中do you think是插入成分，其余部分是宾语从句，作think的宾语；由于引导词在从句中作主语，所以要用主格who(不用whom)。
-I drove to Zhuhai for the air show last week.
-Is that ____ you had a few days off?
A. why B. when C. that D. where
解析：答案是A，why引导的从句作表语，同时why在从句中作原因状语。这里之所以选why，而不是when或 where等，唯一的依据便是句子的逻辑含义，及语境。
whatever,whoever,whichever引导名词性从句
一、基本用法概说英语中的-ever 词主要包括 whatever, whoever, whichever, whenever, wherever, however 等，其中可引导名词性从句的主要有 whatever, whoever, whichever等，其中可引导Roman'; mso-ascii-font-family: 'Times New Roman'">。这里所说的名词性从句主要指主语从句和宾语从句，它们通常不用于引导同位语从句，同时也很少用于引导表语从句。如：Whatever he said was right. 无论他说什么都是对的。(引导主语从句)I don’t believe whatever he said. 无论他说什么我都不信。(引导宾语从句)在某些特定的语境中，也可用于引导表语从句。如：
什么是名词性从句
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
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。
名词性wh-从句
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， 主语： How the book will sell depends on its author. 直接宾语：In one‘s own home one can do what one likes. 间接宾语：The club will give whoever wins a prize. 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. 同位语：I have no idea when he will return.
用 it充当形式主语
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.
名词性从句
名词性从句一.什么是名词性从句？在主句充当名词通常能够充当成分的从句，叫名词性从句。
主语从句，宾语从句，表语从句，同位语从句。
What I need is a new desk.He said that he will leave for Beijing next week.His question is when the sports meet will take place.He told me a lie that he had learned five foreign languages.从以上例句中，可以看出名词性从句没有先行词。
同位语从句的情况待后面解释。
不同的从句在以后的讲解中我们会逐渐熟悉。
二．连接词。
1.That 不充当任何成分，没有任何意思，只起连接作用。
发生了这场事故是你的错。
That the accident happened is your fault.I had no idea that you were here.以上两句中，that 不可省略，只能在宾语从句中省略。
如果省略的话，句子的意思不清，句子成分也不明。
2.whether, if ( 不做句子成分，有意思，有连接作用)The question is whether the book is worth reading.Whether the pollution can be controlled depends on the effect we will make.以上两句不能用if代替whether.If 只能用于宾语从句，但不能用于介词宾语从句。
He didn’t make sure if (whether)he would take p art in the party.Everything depends on whether we have enough experience.3.连接代词或连接副词（所有疑问代词和疑问副词都可以转为连接代词或连接副词）（做句子成分，有意思，有连接作用。
名词性从句
名词性从句一名词性从句包括主语从句、宾语从句、表语从句、同位语从句。
1．主语从句：主语从句在整个句子中作主语。
(1)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,有时为了保持句子平衡, that从句后置, 而由it作形式主语。
其他类似句型还有：It + be +important/ necessary/ obvious + that 从句It + be +reported/believed/thought/has been decided + that从句It + be +a pity/a shame/a fact/a surprise/ common knowledge+ that从句It + happens/occurs/seems/appears + that 从句That the driver could not control his war was obvious.It was obvious that the driver could not control his car.(2)if 不能用在主语从句中，而是用whether Whether he left (or not) is unknown(3)当主语从句作主语时，谓语动词一般用第三人称单数What we need is more time and money.What we need are many more books.2.表语从句：表语从句出现在系动词后，充当表语。
其基本结构为: 主语 + 系动词 + that从句。
The trouble is that we are short of money.Go and get your coat. It’s where you left it.3.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相呼应，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 aroundthe sun(2)连词whether和 if可以互换，但注意下列情况连词后紧跟or not时用whether I want to knowwhether or not they will come. 作介词宾语是用whether引导宾语从句He wasinterested in whether he saw her there. 连接词后直接加不定式，不能用if只能用whether Hedoesn’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 ifhe 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 inher 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that He said (that) he had eaten nothing but that he wasn’t hungry.(6)注意区别if引导的宾语从句和条件状语从句I don’t know if he will come.If he comes, I’ll let you know.注意：beg, insist, desire, command, order, suggest, advise, demand, require, request等动词如果后面加上宾语从句的话, 从句谓语部分必须用should do。
名词性从句
答案：A 参考译文：海龟如何找到返回筑巢区的路，这仍是 一个谜。
3. 名词性关系词引导的主语从句 1）名词性关系代词引导的主语从句
What is most touching in O. Henry’s stories is the bravery with which ordinary people struggle to maintain their dignity . 欧.亨利的小说中最感人的东西是平民为维护尊严而 斗争的勇气。
二、It+be动词+形容词+that从句 It is clear that…显然…… It is possible that…很可能…… It is likely that…很可能…… It is natural that…很自然…… It is certain that…可以相信…… It is strange that…奇怪的是…… It is fortunate that…幸运的是…… It is necessary that…有必要……
As a child —and as an adult as well—Bill Gates was untidy. It has been said that in order to counteract this,Mary drew up weekly clothing plans for him. 译文：童年时期，以及即使长大成人后，比尔.盖茨 也不修边幅。据说为了改掉他的这个毛病，玛丽为 他制定了一周着装计划。
三、It+be动词+名词短语+that从句 It is a pity that…可惜的是…… It is a fact that…事实是…… It is good news that… ……真是太好了。 It is a good thing that… ……真是件好事。 It is no wonder that… 难怪…… It is a shame that…遗憾的是……/……真是太不像话了 It is an honor that…真荣幸…… It is common knowledge that… ……是常识。 It is my belief that … 我相信…… It is a miracle that… ……真是奇迹。
名词性从句
（五）同位语从句 同位语从句在句中作某一名词的同位语， 一般位于该名词（如：news, fact, idea, suggestion, promise等）之后，说明该名词 的具体内容。 e.g. I have no idea when he will be back. The fact that he had not said anything surprised everybody.
3.Wh-ever和 no matter Wh-的区别: Wh-ever:既能引导名词性从句, 又能引导让 步状语从句. no matter Wh-:只能引导让步状语从句. e.g. Whoever breaks the rule shoud be punished. He won’t believe whatever I said. Whatever I said, he won’t believe me. =No matter what I said, he won’t believe me.
注意：连接代词与连接副词在句中不再是疑问句，因而从句中 谓语不用疑问式。连接代词与连接副词在从句充当句子成分， 连接词whether 和if（是否），as if（好象）在从句中不充当句 子成分，只起连接作用。根据句义，如果连接代词与连接副词， whether、if 和as if都用不上时，才用that作连接词（that本身无 任何含义）。
2. that引导的定语从句和同位语从句的区别: that在同位语从句中,不担任成分,只起连接 作用. that在定语从句中，担任成分,可作主语,宾 语和表语 e.g.The news that we heard on the radio is not true. The news that our class won the match was exciting.
名词性从句
2 It + be动词+that 从句 • It’s reported that…据报道……
• • • • • • It’s believed that…据信…… It is generally thought that…人们普遍认为…… It should be noted that …应该注意…… It has been found that…现已发现…… It must be pointed out that …必须指出…… 同样可以这样用的动词还有：say, expect, know, estimate, forecast等。
• 美国知识分子真的受到排斥，并且被认为对社会没有一点 价值了吗？
2. It + be动词+形容词+that从句 • Furthermore, it is obvious that the strength of a country’s economy is directly bound up with the efficiency of its agriculture and industry, and that this in turn rests upon the efforts of scientists and technologists of all kinds. • 再者，很显然，一个国家的经济实力与其工农业 生产效率密切相关，而效率的提高又有赖于各类 科技人员的努力。
• 人们发现，甚至起初对某种气味不敏感的人也能在接触到足够 多的这种气味时突然变得对这种气味敏感了。
• It is generally agreed that a person of high intelligence is one who can grasp ideas readily, make distinctions, reason logically, and make use of verbal and mathematical symbols in solving problems.（1992年英 译汉）
什么是名词性从句
什么是名词性从句？名词性从句（Noun Clauses）是一种在句子中作为名词的从句。
这意味着它可以在句子中担任名词的角色，例如主语、宾语、表语或补语。
名词性从句通常由连接词引导，如that, whether, if, who, whom, whose, which, what, when, where, why等。
下面是关于名词性从句的详细解释和使用方法：1. 主语从句（Subject Clauses）：主语从句在句子中充当主语的角色，它引导整个从句的连接词通常是that或whether。
以下是主语从句的一些例子：- That he passed the exam made her happy.（他通过了考试使她开心。
）- Whether we should go or not is still undecided.（我们是否应该去还没有决定。
）需要注意以下几点：-当主语从句以that引导时，that往往可以省略，但在某些情况下必须保留，如在强调句型中。
-当主语从句以whether引导时，通常表示两个选择或疑问。
2. 宾语从句（Object Clauses）：宾语从句在句子中充当动词的宾语，它可以作为及物动词、介词或不定式的宾语。
以下是宾语从句的一些例子：- She asked if I could help her.（她问我是否能帮助她。
）- He doesn't know what to do.（他不知道该做什么。
）需要注意以下几点：-当宾语从句以that引导时，that往往可以省略，特别是在口语中。
-当宾语从句以whether或if引导时，表示选择或疑问的情况。
3. 表语从句（Predicate Clauses）：表语从句在句子中充当表语的角色，它通常用来描述主语的性质、状态或特征。
以下是表语从句的一些例子：- The important thing is that you try your best.（重要的是你尽力。
(完整版)名词性从句
名词性从句一．概述：在句子中起名词作用的各种从句统称为名词性从句。
根据它们在句中的语法作用，这类从句又可分为主语从句、表语从句、宾语从句和同位语从句。
二．名词性从句连接词四．if, whether的区别1.引导主语从句时，如果主语从句放在句首，只能用whether不能用if引导，但是如果用it 做形式主语，而把主语从句放在句末时，也可以用if引导.2.引导宾语从句时常放在动词know, ask, care, wonder之后，if和whether均可。
少数动词，如: leave, put, discuss, doubt后的宾语从句常用whether. 。
3.在介词后面的宾语从句中，在表语从句、同位语从句中，表“是否”，只能用whether；4.whether和if都可以和or not连用,但是whether 之后可以直接跟or not,而if不可以。
I do n’t know whether or not I will stay.（只能用whether）5.在不定式前只能用whether.如：I can’t decide whether to stay. 我不能决定是否留下。
五．与“命令、要求、建议”等相关的名词性从句中通常用虚拟语气，虚拟语气的构成是“should＋动词原形”或省去should，直接用动词原形。
六．名词性从句以考查引导词为主，同时考查时态，语序，与其它从句的区别以及混同虚拟语气的考查。
一．主语从句1.主语从句定义：在复合句中充当主语的句子叫做主语从句。
That he will succeed is certain.Whether wild life can be well protected is of great importance.Who will go makes no different.Which kind of food is the best is still not certain.What is needed for the space trip is careful preparation.Whoever comes is welcome.How we can help the twins will be discussed at the meeting.When they’ll start the project has not been decided yet.Where he hid the money is to be found out.Why dinosaurs died out remains a puzzle.2.主语从句引导词按照在句中是否做成分主要分为三类：连词that、whether、if 连接代词、连接副词。
名词性从句
名词性从句讲义一．定义名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。
因此，名词性从句可分为主语从句、表语从句、宾语从句和同位从句。
二．分类根据名词性从句在复合句中所做的成份，可将其分为四种：主语从句、表语从句、宾语从句、同位从句。
主语从句：在复合句中作句子主语的从句叫做主语从句 例如：宾语从句： 例如：I think Your success will largely depend on what you do. (介词后的宾语从句) I am glad that you can come . (形容词后的宾语从句) 表语从句：在复合句中做表语的从句叫做表语从句 例如：The fact is that he has lied to you.例如：Will you keep your promise that you will resign? 三．引导词及其作用：1.连词: that （无实意）, if （是否）, whether(…or not)（是否）, as if （好像）；that 无词义，在从句中不担任成分，有时可省略；whether, if, as if 虽有词义，但在从句中不担任成分,不能省略。
例如：That he will go abroad is true.I wonder whether he will come back .2. 连接代词: who ,is not so obvious. (who 译为“谁”，在从句中做2. How he persuaded the manager to change the plan is interesting to us all.3. That is where Lu Xun used to live 。
4. He understood what he was talking about.5. I wonder why she refused my invitation6. The news that they had won the game soon spread over the whole school7. Do you remember the teacher who taught us English at middle school?8. It was snowing when he arrived at the station.主语从句一、 定义：在复合句中作句子主语的从句叫做主语从句 二、 连接词：1. 连词：that, whether, if2. 连接代词：who, whom, whose, what, which, whoever, whatever, whichever3. 连接副词：where, when, how, why ，wherever, however, whenever 三、 主要句型：1. 位于句首的主语从句例如： Whether he comes or not is not sure. 2. it 做形式主语，主语从句放在句末的句型 （1）It+be+形容词+that 从句。
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名词性从句名词性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，名词性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。
1）从属连词that，whether,if等；2）连接代词what，who，which，whatever，whoever，whom 等；3) 连接副词how，when，where，why 等。
常规主语从句，即句子在复合句中充当一个主语主语从句的时态：不受主句的时态影响和限制。
（1）That he finished writing the composition in such a short time surprised us all.（2）Whether we will go for an outing tomorrow remains unknown.（3）Who will be our monitor hasn't been decided yet.（4）Whom we must study for is a question of great importance.（5）What caused the accident remains unknown.（6）Whatever you did is right.（7）Who the watch belongs to is unknown.（8）What we need is time.连词位于句首不能省略为避免头重脚轻，常以形式主语it引导从句。
It+形式主语谓语+从句。
由于主语从句一般被认为是单数形式，形式主语的谓语动词、be动词+表语均为单数第三人称形式或过去式.It 作形式主语和it引导强调句的比较①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句例如：It is still a question whether she will come or not.It is strange that you should like him.It is still unknown which team will win the match.另外，还有一些比较多见的结构：It turned out that……;It has been proved that……;It happened/occurred that……;It is well-known that……等等②而强调句则不同，它的结构是：It+be+被强调部分+that+从句强调主语：It is the times that produce their heroes.时势造英雄强调宾语：It is English that Prof.Lin teaches us.强调状语：It was in shanghai that I saw the film.判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。
2. 用it 作形式主语的结构(1) It is +名词+that从句It is a fact that …事实是……It is an honor that …非常荣幸It is common knowledge that …是常识(2) it is +形容词+that从句It is natural that…很自然……It is strange that…奇怪的是……(3) it +不及物动词+that从句It seems that…似乎……It happened that…碰巧……(4) it is+过去分词+that从句It is reported that…据报道……It has been proved that…已证实……3.主语从句不可位于句首的五种情况(1) if 引导的主语从句不可居于复合句句首。
(2) It is said ,(reported) …结构中的主语从句不可提前。
例如：It is said that President Jingo will visit our school next week. (3) It happens…, It occurs…结构中的主语从句不可提前。
例如：It occurred to him that he failed in the examination.(4) It doesn’t matter how/whether …结构中的主语从句不可提前。
例如：It doesn’t matter whether he is wrong or not.(5) 含主语从句的复合句是疑问句时，主语从句不可提前。
例如：Is it likely that it will rain in the evening?4. What 与that 在引导主语从句时的区别What 引导主语从句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。
例如：What you said yesterday is right.宾语从句有三种情况值得注意(1)在介词后面只能用whether不能用if。
例如①This depends upon whether we are determined to do it.②It depends on whether he is ready.③I am not interested in whether you'll come or not.④We haven't settled the question of whether we'll renew our supplies of coal for factory.(2)在动词不定式之前只能用whether不能用if。
例如①He doesn't know whether to stay or not.②She doesn't knows whether to get married now or wait.(3)在及物动词discuss后的宾语从句中只能用whether不能用if。
例如①We discussed whether we should make a change in our plan.②We were discussing whether we should discuss the business with them.同位语从句一、在复合句中用作同位语的从句叫同位语从句。
它一般跟在某些名词后面，用以说明该名词表示的具体内容。
二、可以跟同位语从句的名词通常有news，idea，fact，promise，question，doubt，thought，hope，message，suggestion，words（消息），possibility等（一般的“抽象”名词都可用）。
I’ve come from Mr wang with a message that he won’t be able to see you this afternoon．三、英语中引导同位语从句的词通常有连词that，whether，连接代词what，who。
连接副词how,when,where等。
（注：if,which 不能引导同位语从句。
）He must answer the question whether he agrees to it or not.四、有时同位语从句可以不紧跟在说明的名词后面，而被别的词隔开。
The thought came to him that maybe the enemy had fled the city.表语从句1.表语从句一定要用陈述语序。
False: The question is when can he arrive at the hotel.Right: The question is when he can arrive at the hotel.2.不可以用if，而用whether 连接表语从句(as if 例外）。
引导宾语从句时可以互换if/whether 位于介词后要用whether，位于句首时要用whether 引导表语从句，主语从句，同位语从句时要用whetherFalse: The question is if the enemy is marching towards us.Right: The question is whether the enemy is marching towards us.3.不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。
Right: The question is who will travel with me to Beijing tomorrow.Right: The question is why he cried yesterday.4.that在表语从句中不可以省掉。
表语从句的基本用法:表语从句只能置于主句之后，而主句的动词只能是联系动词。
名词性从句在be等系动词后作表语时被称为表语从句.例如： The problem is how we can get the things we need. (how 在表语从句中充当方式状语)问题是我们怎样能弄到我们需要的东西。
名词性从句的练习：1.Dad is used to smoking and drinking.There's no chance ________ I'm able to talk him into ________.A．whether；giving it up B．of whether；giving them upC．that；getting rid of them D．which；stopping it答案 C [由smoking and drinking可知，A、D中的代词错误。
B项翻译不通。
注：that引导的是一个同位语从句。
]2．Keep in mind ________ you want others to respect you，you must respect others first.A．that when B．that if C．if when D．when if答案 B [that引导一个宾语从句，宾语从句中又有一个if引导的条件状语从句。
] 3．Shenzhen was only a small fishing village compared to ________ it is now. A．which B．that C．what D．where答案 C [to后是宾语从句，is后缺表语，故用what。