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
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
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。
名词性从句完整版
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从出题者的角度，就是要考察名词性从句中的语序以及引导词之间的区别。有时候，会结合插入语或名词与同位语隔开，或使句子结构复杂化等使得难度增加。其实，总的难度和变化都不大。但是从考生的角度来说，如果考生对句子结构掌握不过硬，对某些词或词组的用法不了解，就会容易造成和定语从句、状语从句的混淆，造成根本环节的误判而用其他从句的规则去解题。造成丢分。
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⒊连接副词：引导从句并作从句的状语 when—表示时间 where—表示地点 why—表示原因 how—表示方式 ①When we’ll have a meeting is not decided. ②I don’t know where I can buy such a book . ③ Why he did it will remain a puzzle forever. ④The question is how we should carry out the plan.
正：It was doubtful if /whether Mary really heard him.
误：If Mary really heard him is really doubtful.
正：Whether Mary really heard him is really doubtful.
eg.Wherever he goes makes his parents worry.
( 主语从句)
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注意：
如何选用连接词？
用法规则:
先根据从句的结构确定用哪种连接词，从句
不缺成分用连词，缺主语、宾语、表语、定语用
连接代词，缺状语用连接副词，再根据从句意思
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。
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名词性从句Noun Clauses一．名词性从句学习目标：1. 在复合句中能识别出主语从句、表语从句、宾语从句和同位语从句；2. 辨别使用引导名词性从句的连接词；3. 区分同位语从句和定语从句。
二．名词性从句在高考中的考查重点：1. that和what引导名词性从句的区别；2. 名词性从句的语序和时态；3. it作形式主语、形式宾语的几种情况；4. 宾语从句的否定转移；5. whether和if的用法区别；6. what在名词性从句中的使用；7. who / whoever, what / whatever等的用法区别；8. 连接词that的省略。
三.Lead-in1.Question:名词在句中可以充当什么成分?2. 名词性从句概念：由一个从句来充当名词的作用，如主语，表语，宾语，同位语等。
His job is important. This is his job.What he does is important. This is what he does every day.I don’t like his job. I don’t know about the man, Mr. White.I don’t like what he does every day. I don’t know about the fact that he is a teacher.3. 名词性从句四.引导名词性从句的连接词可分为三类：1. 连词：that, whether, if不充当从句的任何成分。
2. 连接代词：what, whatever, who, whoever, which, whichever, whom, whose, etc. 不仅起到连接一个句子的作用，同时也是从句的一个组成部分。
3. 连接副词：when, where, how, why, etc.五．名词性从句的用法1.主语从句Subject ClauseHow the book will sell depends on its author.That he is the best student in the class is obvious.Whether we shall attend the meeting hasn’t been decided yet.Who will go makes no difference.在一个句子中由一个句子充当的主语，这个句子叫做主语从句。
注意一:主语从句后置!为了避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.1.That we shall be late is certain.It’s certain that we shall be late.2. That the earth is round is known to all.-- It’s known to all that the earth is round.3. That you missed the chance is a pity.--It is a pity that you missed the chance.it作形式主语，that引导的从句是句子的真正主语,有以下四种不同的结构：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……It + be + 形容词+ that-从句(常用的形容词有:likely, right , wrong, certain, necessary, important, natural, strange, obvious, clear等)从句谓语动词常用“should +动词原形”，should 也可省略。
It is necessary that we (should) buy a Chinese-English dictionary.It is likely that there will be a snowstorm tomorrow.b. It + be + -ed（said/reported）分词+ that-从句It is believed that …人们相信……It is known to all that …众所周知……It has been decided that …已决定……常用的动词-ed 形式：said, believed, hoped, reported, told, thought, advised, decided, suggested, ordered等It is said that the famous writer will visit our school next week.It was suggested that each student (should) sing a song in English.※在“It is advised/decided/suggested/ordered+ that从句”结构中，从句谓语动词常用“should +动词原形”，should 也可省略。
c. It + be + 名词(a pity/no surprise)+ 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……常用的名词有：a pity, a shame, a fact, an honor, a wonder, no wonder, good news等It is a pity that you didn’t attend the lecture.It is no wonder that you have achieved so much success.d.It +特殊动词+ that 从句It appears that …似乎……It happens that …碰巧……It occurred to me that …我突然想起……It happened that I knew how to deal with it.It doesn’t matter whether he is wrong or not主谓一致问题主语是名词性从句, 动词通常用单数。
What I am most interested in is American movies.我最感兴趣的是美国电影。
What you said yesterday is right.你昨天说的是对的。
whether与if均为“是否”下列情况下只用whether：Whether he will come is not clear. 1. 引导主语从句并在句首The question is whether he’ll come.2. 引导表语从句I’m not sure about whether we’ll win.3. 从句作介词宾语Whether you like it or not, you’ll have to do it.4. 从句后有"or not"2. 表语从句Predicative Clause在一个句子中由一个句子充当的表语，这个句子叫做表语从句。
The question is whether he will come or not.Changsha is not what it used to be.This is how we got out of trouble then.It looks as if it is going to rain.The fact is that he has not been seenrecently.The reason why he was late was that he didn’t get up on time.My suggestion is that we should turn the land into rice fields.如果引出表语从句的名词是一些表示“建议”或者是“命令”之类的词, 如:advice, suggestion, proposal, order, plan, idea等, 那么从句中的动词通常1) My suggestion is that we all ___________ (take) an active part in the coming sports meet.2) His proposal was that the work _________________ (finish) in five hours.宾语从句Object Clause在一个句子中由一个句子充当的宾语，这个句子叫做宾语从句。
通常放在主句谓语动词（及物动词）或介词之后作动词的宾语She did not know what had happened.She told me that she would accept my invitationI worry about whether he can get over the illness.John said that he was leaving forLondon on Wednesday. .2. 作介词的宾语Our success depends upon how well we can cooperate with one another.3. 作形容词的宾语I am afraid (that) I’ve made a mistake.that引导的从句常跟在下列形容词后作宾语：anxious, certain, convinced,determined, glad, proud, surprised, worried, sorry, ashamed, disappointed,annoyed, pleased, satisfied, content等。
4.it可以作为形式宾语it不仅可以作为形式主语，还可以作为形式宾语，而真正的宾语则放在句尾，特别是在带复合宾语的句子中。
She has made it clear that she will get married next month.下列动词后常引导宾语从句make, think, consider, feel, find等。