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高中英语语法之名词性从句在句子中起名词作用的句子叫名词性从句（Noun Clauses）. 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。
一、引导名词性从句的连接词引导名词性从句的连接词可分为三类：连词：that（无任何词意)whether,if（均表示“是否"表明从句内容的不确定性）as if ，as though（均表示“好像”，“似乎"）以上在从句中均不充当任何成分连接代词：what, whatever, who， whoever, whom,whose, whichever,whomever连接副词:when, where, how, why,how many,how much，how often不可省略的连词：1。
介词后的连词2。
引导主语从句和同位语从句的连词不可省略。
That she was chosen made us very happy. We heard the news that our team had won。
比较：whether与if 均为"是否"的意思。
高考英语语法复习名词性从句讲解练习名词性从句是指在复合句中起名词作用的句子，功能相当于名词词组。
名词性从句在复合句中能作主语、宾语、表语、同位语等，根据在句中的语法功能可分为主语从句、宾语从句、表语从句和同位语从句。
一、主语从句【定义】在复合句中，作主语的句子称为主语从句。
【常见的连接词】（连接词在句中不能省略）that, whether, who, what, whatever, whoever, where, when, why, how等。
【用法】连接词 that 引导That we should learn English well is very important.主语从句中 we should learn English well句子完整，不缺成分，用that引导，that 不能省连接词whether，if 引导whether 引导的主语从句可放句首，也可放句中，表“是否”if 引导的主语从句只能引导动词后的宾语Whether I will go or not depend on the weather.It remains to be seen whether / if they can finish the task in time.2.连接代词what, who, which, whose, whatever, whichever，whoever等引导What matters most is your attitude.3.连接副词when，where，why，how等引导How he made it is still unknown.4.it作形式主语为了避免句子头重脚轻，通常把形式主语it放在句首，真正的主语放在句子后面。
常见句型：(1) It is + n.+ that + 句子It is +（a pity / a shame / a fact …）+ that ...(2) It is + adj.+ that + 句子It is +（true / clear / important …）+ that ...(3) It is + 过去分词 + that + 句子It is+ said / announced / expected / believed / hoped… + that ...(4) It seems /appears / happens / turned out that + 句子(5) It hit sb./occurred to sb.that + 句子二、宾语从句【定义】在复合句中，作宾语的句子称为宾语从句。
（完整版）高中英语名词性从句讲解（可编辑修改word版）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。
名词性从句讲解思维导图（附练习题）Whoever / Anyone who walks around in such a heavy rain willcatch a cold.Ⅲ whichever ‘无论哪个;无论哪些’,既指人,又指物. 可修饰名词与of连用Whichever book you borrow doesn’t matter to us.Whichever of us fulfills his task will lend a hand to others.定义：在复合句中充当宾语功能的句子叫宾语从句We can learn what we didn’t know.We find it necessary that we (should) practice English every★某些作表语的形容词，如sure, happy, glad, certain等之后可从句I am glad that you can come and help me.wish/would rather后的宾语从句中要用虚拟语气。
I wish I had finished my homework yesterday.I’d rather you had been there yesterday②在表示建议,命令, 请求的词后面的宾语从句当中用should + V,可以省略His pale face suggested that he was ill so I suggested thatto see the doctor.He insisted that he was innocent and insisted that he should③注意it作形式宾语的结构We all thought it a pity that we had missed the lesson.I took it for granted that they were not coming.④ that一般不接介词宾语，偶尔可作except, in的宾语；其它介词后面需用it作形式宾语He differs from his roommates in that he devoted his spare time toreading.He knows nothing about Jim except that he is from London.You can depend on it that he will help you in time of emergency.定义：充当表语功能的句子被叫做表语从句。
高中英语名词性从句引导词辨析练习题30题答案解析版1._____ is known to all, the environment is of great importance.A.WhatB.AsC.WhichD.That答案解析：B。
“As is known to all”是固定用法，意为“众所周知”，as引导非限制性定语从句，指代后面整个句子。
A 选项“What is known to all”这种表达错误；C 选项“Which”引导定语从句时要有先行词且一般用于非限制性定语从句时表示选择关系；D 选项“That”不能引导非限制性定语从句。
2.We don't know _____ he will come or not.A.ifB.whetherC.thatD.when答案解析：B。
“whether...or not”是固定搭配，表示“是否”。
A 选项“if”不能与“or not”连用；C 选项“that”在宾语从句中无实际意义，不表示“是否”；D 选项“when”表示时间，不符合语境。
3._____ he said at the meeting surprised us all.A.WhatB.ThatC.WhichD.When答案解析：A。
“what he said”在句子中作主语，“what”在主语从句中作“said”的宾语。
B 选项“That”在主语从句中不充当成分，只起连接作用，此句缺少宾语；C 选项“Which”要有选择范围；D 选项“When”在主语从句中作时间状语，此句不是时间相关的主语从句。
4.Can you tell me _____ you are waiting for?A.thatB.whoC.whomD.when答案解析：B。
此句中“waiting for”缺少宾语，根据语境询问的是人，“who”在宾语从句中作“waiting for”的宾语，且主格形式；C 选项“whom”是宾格形式，但此句需要主格；A 选项“that”在宾语从句中无实际意义，不充当成分；D 选项“When”在宾语从句中作时间状语，不符合语境。
名词性从句用法解说与专项练习题及答案名词性从句包含主语从句、宾语从句、表语从句和同位语从句。
高考常从连结词的选择、语序、语气、时态等方面来考查。
名词性从句中的连结词有连词that / whether / as if，连结代词what / who/ which /whose / whatever / whoever / whomever / whichever，连结副词where /when /why / how / wherever / whenever。
第 1讲指引名词性从句的连结词考点 1. 指引名词性从句的连结词有哪些有学生以为，指引同位语从句只好用that,这句话对吗？先看下边几个句子。
①I have no question that he will come.②I have a question whether he will come③I have a question when he will come.我们能够看出：上边三个句子中question后边都是同位语从句，都是说明question的内容的。
在句①中，同位语从句的原句是陈说句，由that指引；在句②中，原句是一般疑问句，由whether 指引；在句③中，同位语从句的原句是特别疑问句，特别疑问词也起着连结作用。
其实，所出名词性从句的连结词都有上边的三种状况。
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 themedicine 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______ thepresident can do to end the strike.A. howB. whichC. thatD. what3.【 2012 山东】It doesn’t matter ______ you pay by cashor credit card in this store.A. howB. whetherC. whatD. why4.【 2013 陕西】 It remains to be seen ______ the newlyformed committee ’s policy can be put into practice.A. thatB. whichC. whatD. whether5.【 2009 天津】It is obvious to the students______ theyshould 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.指引词that的省略问题主语从句、表语从句、同位语从句中连词that不可以省略。
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。
高中英语名词性从句专题讲解及巩固练习定义：起名词性作用的从句，叫名词性从句。
本来该由名词充当的主语、宾语、表语和同位语部分，换由一个句子来充当，这样的句子就是名词性从句。
【归纳】1.只能用whether,不能用ifa.主语从句b. 表语从句c. 同位语从句e. 介词后的宾语从句f. whether to do 做动词宾语不能用if to do.g.whether or not 连在一起引导宾语从句时不用if.2.that和what的区别what除起连接作用外，还在名词性从句中充当成分，可做从句的主语、宾语、或表语。
that在名词性从句中不充当任何成分，只起连接作用。
例：I have no doubt that he will come.I have no idea what he did that afternoon.一．主语从句：在复合句中作主句的主语。
●__________ he is a famous singer is known to us.●__________ he will go to America is not yet fixed.●__________ she’s coming or not doesn’t matter too much.●__________ broke the glass yesterday is not clear.【keys】That; When/How; Whether; Who【归纳】1.为避免主语冗长,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。
例：That her hair was turning gray worried her a lot.-----It worried her a lot that her hair was turning gray.常考句型：It’s likely / possible / important / necessary / clear that…很可能/ 重要的是… / 必要的是… / 很清楚…It’s said / reported that…据说/据报道…It seems / appears / happens that…显然、明显、碰巧…It’s been announced / declared that…已经通知/宣布…It’s no wonder that…并不奇怪/无疑…It’s a pity/a fact /a common knowledge / a common saying that…2.if不能引导主语从句，只能用whether3.单个的主语从句作主语时，谓语动词用句单数形式；如果是两个或两个以上的主语作主语，谓语动词则视情况而定。
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。
高中英语名词性从句详细讲解与练习在句子中起名词作用的从句叫名词性从句。
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，因此根据它在句中不同的语法功能，名词性从句又可分为主语从句、宾语从句、表语从句、同位语从句。
引导名词性从句的词叫做连接词，包括：1.连词（在名词性从句中只起连接作用，不作成分）2.连接代词（在名词性从句中作主语、宾语或表语）3.连接副词（在名词性从句中作状语）所有的名词性从句的语序都是陈述语序。
I主语从句：是在主句中作主语的从句。
它由连接词引导，通常位于谓语动词之前。
连接词：1.连词：在从句中不充当任何成分，常见的引导主语从句的连词有that, whether oThat he got the first prize excited him much.他获得一等奖一事使他非常兴奋。
It is doubtful whether we can get there on time.我们能否按时到达那儿还不确定。
D that引导的主语从句:在从句中不作任何成分，也没有实际意义。
一般情况下that不可省略。
That light travels in straight lines is known to all.众所周知，光沿直线传播。
That you don't like him is none of my business.你不喜欢他不关我的事。
2）whether引导的土语从句:常置于句首，表示“是否”之意；if一般不引导主语从句。
Whether he can finish his task on time is of greatimportance.他是否能按时完成任务非常重要。
Whether you can succeed or not depends on howhard you work at it.你能否成功取决于你努力的程度。
2.连接代词：在从句中起名词或代词的作用，常作从句的主语、宾语、表语或定语,有具体意义且不能省略。
最新精品-高中英语语法通霸-名词性从句用法讲解与专项练习题及答案说课讲解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 wh en 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 medicinewill bring about, although about two thousand patients have taken it.2. A. that B. what C. how D. whether3.【2012全国新课标】It is by no means clear ______ thepresident can do to end the strike.4. A. how B. which C. that D. what5.【2012山东】It doesn’t matter ______ you pay by cash orcredit card in this store.6. A. how B. whether C. what D. why7.【2013陕西】It remains to be seen ______ the newlyformed committee’s policy can be put into practice.8. A. that B. which C. what D. whether 9.【2009天津】It is obvious to the students ______ theyshould get well prepared for their future.10.A. as B. which C. whether D. that11.【2012江西】It suddenly occurred to him ______ he had lefthis keys in the office.12.A. whether B. where C. which D. 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。
That they are good at English is known to us all.The problem is that we don’t have enough money.She expressed her hope that they would come to China oneday.只有宾语从句中的连接词that可省略，但在以下几种情况中that 也不能省略：A.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.B.当两个名词性从句并列作宾语时，后面的that不能省。
Everyone knew what happened and that she was worried.C.当that作介词宾语时，that不可省掉。
The reason lies in that she works harder than the others do.13.______ we need more practice is quite clear.14.A. When B. What C. That D. /15.______ fashion differs from country to country may reflectthe cultural differences from one aspect.16.A. What B. That C. This D. Which17.【2010上海】One reason for her preference for city life is______ she can have easy access to places like shops and restaurants.18.A. that B. how C. what D. why19.The reason why I didn’t go to Shanghai was ______ a newjob.20.A. because I got B. because of getting21.C. I got D. that I got22.【2011全国I】The next thing he saw was smoke ______from behind the house.23.A. rose B. rising C. to rise D. risen24.Having checked the doors were closed, and ______ all thelights were off, the boy opened the door to his bedroom.25.A. why B. that C. when D. where26.I know nothing about the young lady—______ she is fromBeijing.27.A. except B. except for C. except that D. besides28.Human beings are different from animals ___ they can uselanguage as a tool to communicate.29.A. for that B. in that C. in which D. for which30.(如果不理解本题，可以参看P. 151考点5)考点3.whether 与if引导名词性从句时的区别A.在主语从句、表语从句、同位语从句中只能用whether,不能用if。
Whether the meeting will be put off has not been decided yet.The question is whether they have so much money.We ought to discuss carefully the question whether we can do it or not.B.在宾语从句中whether和if可以互换，但：i.作介词宾语时连接词一般用whether。
如：ii.It all depends on whether they will come back.iii.后面直接跟or not 时用whether。
如：iv.I didn’t know whether or no t he had arrived in Wuhan.C.whether也可与动词不定式连用，但if不能。
D.I have not decided whether to go or not.E.whether常与or连用表示一种选择，if不能这样用：F.The question of whether they are male or female is notimportant.G.whether可引导一个让步状语从句表示“不管”、“无论”，而if不能。
如：H.Whether he comes or not, we will begin our party on time.I.discuss后通常用whether。
31.______ you can succeed in the end will mainly depend on______ you do and ______ you do it.32.A. If; what; why B. Whether; what; how33.C. Whether; how; why D. That; whether; how34.【2009上海】It is not immediately clear ______ thefinancial crisis will soon be over.35.A. since B. what C. when D. whether36.They discussed ______ they could settle the problemwithout oth ers’ help.37.A. if B. that C. what D. whether38.What the doctor is uncertain about is ______ my mother willrecover from the serious disease soon.39.A. when B. how C. whether D. why40.Mr. Hopkins has not yet answered my question ______ I cango with him to ______ he calls the Underground Treasure House next week.41.A. that; which B. that; where42.C. whether; that D. whether; what43.I have no idea ______ or not he has finished the work.44.A. if B. that C. whether D. which考点4.question 与doubt 后跟同位语从句时的连接词问题doubt，question用于肯定结构时，后面用whether引导名词性从句；用于否定结构或疑问结构时，后面用that引导名词性从句。
