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名词性从句讲解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。
分析历届高考试题名词性从句考查的焦点主要有以下六个方面1. 考查名词性从句的语序问题2. 考查引导词that与what的区别3. 考查it在名词性从句中作形式主语或形式宾语的用法4. 考查whether与if的区别5. 考查名词性从句中的疑问词+ever引导的名词性从句与no matter+疑问词引导的状语从句的区别6. 考查名词性从句的虚拟语气问题语法要点剖析一、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。
高中英语名词性从句知识讲解以及练习题附答案一、名词性从句概述名词性从句是一种充当名词作用的从句，通常在主句中作主语、宾语、表语或同位语。
它通常由引导词（如that, whether, if, who, whom, whose, which, what等）引导，并且从句中含有一个主语和谓语。
名词性从句的种类有很多，包括主语从句、宾语从句、表语从句和同位语从句等。
下面我们将逐一介绍这些从句。
二、主语从句主语从句作为一个名词，通常位于句首，是一个句子，主要作用是作为主句的主语。
引导主语从句的词：What (什么)；Whether (是否)；If (是否)；That (那个)。
例句：What he said is true. (他说的是真的。
)Whether it will rain tomorrow is uncertain. (明天是否会下雨还不确定。
)If you go, I will go too. (如果你走，我也跟着走。
)That he is coming is good news. (他来的消息是好消息。
)注意：主语从句的谓语动词通常要用单数形式。
What引导的主语从句通常用来表示“事物”的概念。
三、宾语从句宾语从句是一个名词，通常位于主句的动词后面，作为主句的宾语。
它可以由常见的宾语从句引导词引导，例如whether, if, that, who, whom, whose, what, when, where, how等。
引导宾语从句的词：Whether (是否)；If (是否)；That (那个)；Who (谁)；Whom (谁)；Whose (谁的)；What (什么)；When (何时)；Where (何处)；How (如何)。
例句：I know that he is coming. (我知道他要来。
)I wonder if he is telling the truth. (我想知道他是否说了真话。
名词性从句讲解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。
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（两种结构，三类连接词）两种结构1.主语从句位于句首：What he wants is a book.Who kept the door open all night was unknown.2.主语从句位于句尾，it 作形式主语。
（1）It + be + 名词+ that从句It’s a pity that we can’t go. 很遗憾我们不能去。
It’s no surprise that our team should have wo n the game. 我们没赢这场比赛真意外。
（2）It + be + 形容词+ that从句.It seems obvious that we can not go on like this. 很明显我们不能这样下去了（3）It + be + 动词的过去分词+ that从句It is known to all that light travels in straight lines.众所周知光沿直线传播。
It is reported that China has sent another man-made earth satellite into orbit.（4）It + 不及物动词+ that 从句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…三类连接词:1.连词that whetherthat引导的主语从句:引导词that无含义,在句中不做成分,不可以省。
名词性从句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，名词性从句厅分为主语从句、表语从句、宾语从句和同位从句。
（一）引导名词性从句的连接词1、连接代词：who, whose, whom, what, which。
有词义，在从句中担任成分，如主语、表语、宾语、或定语等。
2、连接副词：when, where, why, how。
有词义，在从句中担任成分，作状语。
3、连接词：that, whether, if, as if。
that 无词义，在从句中不担任成分，有时可省略；if (whether), as if虽有词义，但在从句中不担任成分。
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）。
（二）主语从句…1、主语从句在复合句作主语。
. Who will go is not important.2、用it作形式主语，主语从句放在句末。
. It doesn’t matter so much whether you will come or not.3、that引导主语从句时，不能省略。
. That he suddenly fell ill last week made us surprised.（三）表语从句1、表语从句在复合句中作表语，位于系动词之后。
）. The question was who could go there.2、引导表语从句的连接词that有时可省去。
. My idea is (that) we can get more comrades to help in the work.（四）宾语从句1、宾语从句在复合句中作宾语。
各类从句详解英语从句可以分为名词性从句、定语从句和状语从句三大类：下面我们逐一进行说明：一、名词性从句（主语从句、表语从句、宾语从句、同位语从句）主语从句、表语从句、宾语从句和同位语从句在复合句中的充当的成分和其名称相同，分别作主句的主语、表语、宾语和同位语。
上述这四种从句均被称为名词性从句。
所有的名词性从句均不能用逗号分开，并且它们都用相同的关联词，关联词如下：①主从连词：that (无意义), whether (是否), if (是否)（在句子中不充当任何成分）②连接代词：who (谁), whom (谁), whose (谁的), what (什么), which (哪一个)③连接副词：when (什么时候), where (什么地方), how (怎样), why (为什么)主从连词只起连接作用，连接代词和连接副词除了起连接作用外，还充当从句某一个成分。
另外，可以用whatever, whichever, whoever, who(m)ever等连接代词引导名词性从句，来加强语气。
下面分别对各种名词性从句进行介绍（一）主语从句（subject clause）在主句中用作主语的主谓结构称之为主语从句。
例如：That he will come to the discussion is certain.他来参加讨论是确定的。
That the moon moves round the earth is well known to all of us.月球绕地球转动，这是我们大家都熟知的。
When the meeting is to be held has not yet been decide.会议什么时候召开还没有决定。
主语从句放在句首，句子常常显得比较笨重，因此通常可以把it放在句首，作形式主语，而将主语从句放在后面。
例如上面的句子可以分别改写为：It is certain that he will come to the discussion.It is well known to all of us that the moon moves round the earth.It has not yet been decide when the meeting is to be held.下面再举一些例句：What they are after is profit.他们追求的是利润。
主语从句考点1从属连词thatwhether,在从句中只起连接作用，不作成分。
译1 :他突然病倒使我们很吃惊。
译2 :你能否成功取决于你努力的程度。
特别注意:if _般不引导主语从句。
That在主语从句中虽无具体含义,但不能省略。
例：n early all behavior is learned behavior is a basic assumpti on has bee n put forward by social scienists.考点2主语为从句时,谓语动词一般要用单数形式；但what引导的从句作主语、代表复数概念时，谓语动词则常用复数形式。
译1 :我们所需要的是水。
译2 :我们所需要的是有用的书。
例:I regret most is that I have promised to make friends with the dishonest girl.考点3 when where how why等在从句中作状语译1 : Where the English evening will be held has not yet been announced.译2 :它们为什么突然消失还是个谜。
考点4 it+be+adj./n./p.p./v.+that 从句Necessary likely obvious natural a shame said matter happen to sb.例:is known to us all that the 2012 Olympic Games took place in London.例：It never occurred to humans until the mid-1990ssome animals can be cioned.宾语从句考点1从属连词有:that/whether/if连接代词有:that/who/whose/which/whatever/whoever/whosever/whichever 等连接副词：how,when,where,why,whenever,wherever,however特别注意:that引导宾语从句时,常被省略，但下列情况不能省略。
名词性从句一、名词性从句的种类名词性从句一共有三种: that从句、whether(if)从句、疑问词所引导的从句；名词性从句具有名词的功能，可充当句子主语、宾语、表语、同位语，用名词性从句充当这几种成分，称为主语从句、宾语从句、表语从句、同位语从句。
二、that从句任何一个陈述句前面冠子that，即为that从句:He doesn't believe my words.(句子)→ that he doesn't believe my words.(名词性从句)He enjoys dancing.(句子)→ that he enjoys dancing(名词性从句)There is a lot of work to do.(句子)→ that there is a lot of work to do.(名词性从句)三、whether从句本从句系由一般疑问句演变而来。
1.问句有be动词时，主语与be动词还原，前面冠以whether(if):Is he happy?(句子)→ whether he is happy(名词性从句)(他是否快乐)2.问句有一般助动词(can、will、may、should、ought to、must、have)时主语与助动词还原，前面冠以whetherCan he do it?(句子)→ whether he can do it(名词性从句)(他是否能做这件事)Has he done it→ whether he has done it(他是否已做好此事)3.问句有do、does、did等助动词时主语与助动词还原，再将do、does、did去掉，后面的动词依人称和时态变化Did he come?(问句)→ whether he did come→ whether he came(名词性从句)(他是否来了) Does he like it?→→四、疑问词从句本从句系由疑问词( when what、how、where、why)等引导的特殊疑问句变化而成，这种由疑问词引导的问句称为特殊疑问句。
高中英语讲义---- 名词性从句（主从、表从、宾从，同从）1，陈述句做名从用连词that + SV, that 表主句肯定从句完整，不做成分。
主从可用it 做形式主语，宾从第一个that 可省略。
You study hard.主从：That you study hard is known to us.= It is known to us that you study hard.表从：My opinion is that you study hard .宾从：I think (that) you study hard. …and that (不能省略)….同从：My opinion that you study hard is known to us. *比较同从和主从！●一般抽象名词后对其进行解释和说明的完整句子就是其同位语从句，不完整就是定语从句。
I appreciate your idea that we have an exam every week. （that后完整—同从）I appreciate your idea that you came up with last time.（that后不完整---定从）2，一般问句做名从用连词whether(是否) + SV，whether表主句不肯定从句完整，宾从中可用if（介词后或宾从后有or not时只用whether）。
Does your friend like English ?主从：Whether your friend likes English isn’t clear .=It isn’t clear whether your friend likes English.表从：My question is whether your friend likes English.宾从：I don’t know whether/ if your friend likes English.同从：My question whether your friend likes English isn’t clear.3, 特殊问句做名从用疑问词（连词）+ SV, 疑问词做主语时直接+谓语。
名词性从句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，名词性从句分为主语从句、表语从句、宾语从句和同位从句。
（二）主语从句1. 主语从句在复合句作主语。
e.g. Who will go is not important.2. that引导主语从句时，不能省略。
e.g. That he sudde nly fell ill last week made us surprised.3. 用it作形式主语，主语从句放在句末。
It+ 系动词+ 形容词+that 从句. necessary,right,likely,wrong,important,certain,clear...It+ 系动词+ 名词+that 从句. a pity, a shame, a fact,no wonder...It+be + 动词ed+that 从句.said,told,reported,suggested,considered....It+ 特殊动词+that 从句. seem,turn out,appear,matter...e.g. It does n ' t matter so much whether you will come or not.4. whether引导的主语从句可放句首，而if引导的主语从句不能放句首，只能放句末。
Whether the worked can be completed on time is doubtful.It is doubtful whether/if the work can be completed.三)表语从句1、表语从句在复合句中作表语，位于系动词之后。
e.g. The question was who could go there.2 、引导表语从句的连接词that 有时可省去。
e.g. My idea is (that) we can get more comrades to help in the work.3. 一般不用if 引导表语从句，用whether.The question is whether we can reduce the cost of the product.4. 其他连接词：as if ,as though,because,as,like.It sounds as if/though he has been really ill.5. 主语为reason ：表语从句中的连接词要用that ，不用why.The reason why he was unhappy is that he has lost his keys.6. 表语从句中的虚拟语气. 四)宾语从句1、宾语从句在复合句中作宾语。
名词性从句用法讲解与专项练习题及答案名词性从句包括主语从句、宾语从句、表语从句和同位语从句。
高考常从连接词的选择、语序、语气、时态等方面来考查。
名词性从句中的连接词有连词that / whether / as if，连接代词what / who/ which /whose / whatever / whoever / whomever / whichever，连接副词where /when /why / how / wherever / whenever。
第1讲引导名词性从句的连接词\考点1. 引导名词性从句的连接词有哪些有学生认为，引导同位语从句只能用that, 这句话对吗先看下面几个句子。
①I have no question that he will come.②I have a question whether he will come③I have a question when he will come.我们可以看出：上面三个句子中question后面都是同位语从句，都是说明question的内容的。
~在句①中，同位语从句的原句是陈述句，由that引导；在句②中，原句是一般疑问句，由whether引导；在句③中，同位语从句的原句是特殊疑问句，特殊疑问词也起着连接作用。
其实，所有名词性从句的连接词都有上面的三种情况。
宾语从句：I don’t know that he will come.I don’t know whether/if he will come.I don’t know when he will come.【表语从句：What I don’t know is that he will come.What I don’t know is whether he will come.What I don’t know is when he will come.主语从句That he will come is obvious.Whether he will come isn’t known yet.When he will come isn’t known yet.^1. 【2010浙江】It is uncertain ______ side effect the medicine will bring about, although about two thousand patients have taken it.A. thatB. whatC. howD. whether2. 【2012全国新课标】It is by no means clear ______ the president can do to end the strike.A. howB. whichC. thatD. what3. 【2012山东】It doesn’t matter ______ you pay by cash or credit card in this store.A. howB. whetherC. whatD. why4. 【2013陕西】It remains to be seen ______ the newly formed committee’s policy can be put into practice.]A. thatB. whichC. whatD. whether5. 【2009天津】It is obvious to the students ______ they should get well prepared for their future.A. asB. whichC. whetherD. that6. 【2012江西】It suddenly occurred to him ______ he had left his keys in the office.A. whetherB. whereC. whichD. that考点2. 引导词that的省略问题主语从句、表语从句、同位语从句中连词that不能省略。
名词性从句基本用法一、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、宾语从句和同位语从句。
二、引导词：1、种类：有连词that / whether / as if，连接代词what / who/ which / whose / whatever / whoever / whomever / whichever，连接副词where / when / why / how / wherever / whenever。
2、功能：名词性从句的引导词一般都有意义且在从句中充当主语、宾语、状语等成分，但that 引导名词性从句在从句中只起连接作用，无义且不作成分；whether/if引导名词性从句表“是否”之意，但在从句中不作成分。
3、that引导名词性从句的特殊用法。
1）、that引导主语从句、表语从句、同位语从句时不能省略。
如：①That they are good at English is known to us all.②The problem is that we don’t have enough money.③She expressed the hope that they would come to China one day.2）、that引导宾语从句时可省，但在以下几种情况中不能省略：①当that从句和主句谓语动词之间有插入词语或者从句主语之间有插入语时，that不可省略；He judged that, because he was a child, he did not understand wine.②当that 从句与另一名词性从句并列作宾语时，that不能省；Everyone knew what happened and that she was worried.③当that作介词宾语时，that不可省掉。
但that引导的宾语从句只有在except, in, but, besides等少数介词后偶尔可能用到;e.g. Your article is all right except that it is too long．The reason lies in that she works harder than the others do.④that从句作主语和宾语时，可以用it 来替换成以下几种结构表达。
**that引导主语从句借助it作形式主语的情况：It 作主语的常用句型有:A. It + be +形容词 + that 从句B. It + be +名称词组(duty/pity..) + that 从句C. It + be + 过去分词(said/thought..) + that 从句D. It +不及物动词(seem/happen..) + that 从句用形式主语 it 的主语从句常见结构A.It is clear (necessary, important, possible,remarkable that… 很清楚（必要, 重要,可能, 值得注意等)…B.It is a fact (a good thing, good news…) that … 事实是 ( 好事是,好消息是…)…C.It is well-known ( reported, recorded, estimated,said, believed) that…众所周知( 据报道,,据记载,据说,据估计)…D.It turns out ( seems, happens, appears…) that… 结果是 ( 似乎是, 碰巧是, 好象是…)…E.It has been found (has been proved,can be seen,must be pointed out) that …已发现( 已证明,可以看出,需指出)…如：It is a pity that we can’t go swimming.真可惜我们不能去游泳.It happened that I was out that day.碰巧那天我外出了.It is certain that he will do well in the exam.他考试肯定会考好.It is said that he told her everything.据说他已告诉了她一切.***用it 作形式宾语时, 通常将宾语从句移至补语的后面, 即: “主 + 谓 + it + 宾语的补语 + 宾语从句” 。
如：She made it a rule that she got early every morning.She made it clear that it was not her fault.⑤that和what的区别。
that 引导名词性从句时，在主从句中不以当任何句子成分，也没有任何含义；而what引导名词性从句时，在主从句中都要充当一定的句子成分，what可以分解成定语从句中的先行词 + 关系代词，即常说的先行词 + that。
如：It’s shame that he has made s uch a mistake.Do what he says= Do everything that he says.4、名词性从句与定语从句的区别。
1）、同位语从句与定于从句的区别A.that引导的同位语从句：（1）从先行词看同位语从句与名词之间在逻辑上是“主语+be+表语”的关系。
该名词是需要做特殊说明的抽象名词。
例如：They were delighted at the news that their team had won.The news was that their team had won.(2)从引导词来看引导词that在同位语从句中是连词，只起连接作用，无具体词意，that不可省略；that 在定语从句中是关系代词，它在从句中充当一定成分——主语或宾语，有具体词意，作宾语时还可以省略。
The factory (that) we visited yesterday is a chemical one.The news that he will leave for Shanghai is true.B.when和where引导的同位语从句与定语从句的区别。
when 和where前面的名词若是表示时间、地点的名词，则when和where引导的是定语从句，否则则为同位语从句。
如：They put forward the question where they could get the money.（同位语从句）This is the place where the accident happened.（定语从句）5、名词性从句中主句和从句的时态、主谓一致情况（1）宾语从句中主句和从句的时态保持一致，但如果从句中表示提示的是客观现象，虽然主句是过去时态，从句仍用一般现在时。
如：Hello, I didn’t know you were in London. How long have you been here?The teacher told us that light travels at a very high speed.（2）主语从句作主语相当于单数第三人称作主语，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作主语时，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。
如：When the meeting will begin has not been decided yet.When they will start and where they go have not been decided yet.When and where the meeting will begin has not been decided.6.、宾语从句（The Object Clause）宾语从句在复合句中起宾语作用，可以作动词的宾语，也可以作介词的宾语。
e.g.1）、做动词的宾语(1)大部分宾语从句直接跟在动词后：e.g. He doesn't know where the post office is.(2)有些宾语从句前要有间接宾语：e.g. He told me what I should read．(3)如果宾语从句后面有宾语补足语，要使用形式宾语 it 而将从句放到补足语后面；e.g. I thought it strange that he failed to call me．我觉得奇怪：他没给我打电话。
(4)在think, believe, suppose, expect等动词之后的宾语从句中，如果从句谓语是否定含义，则不用否定形式,而将主句谓语动词think等变为否定形式;e.g. I don’t think you are right．我想你是不对的。
(5) 在think，believe，imagine，suppose，guess，hope等动词以及I’m afraid 等后，可用so代替一个肯定的宾语从句，还可用not代替一个否定的宾语从句：e.g. 一Do you believe it will clear up?你认为天气会转晴吗?一I believe so. 我认为会这样。
I don't believe so.(或I believe not.)我认为不会这样。
2）、做介词的宾语：It depends on whether we have enough time.但that引导的宾语从句只有在except, in, but, besides等少数介词后偶尔可能用到;e.g. Your article is all right except that it is too long．7. because, as if, as though 引导的表语从句because引导表语从句通常只用于“This/That/It is because…”结构中。
as if/though引导的表语从句常置于连系动词look, seem, sound, be, become等后面，常用虚拟语气，表示不存在的动作或状态。
e.g. It sounds as if/though somebody was knocking at the door.My anger is because you haven’t written to me for a long time.名词性从句是高考英语的重点考查内容之一，掌握其常见考点对提高应试技能很有益处。
