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高考英语一轮复习语法点专题讲解名词性从句名词性从句名词性从句包括主语从句、表语从句、宾语从句、同位语从句。
其关联词有连接词that，if，whether；疑问代词who，what，which和疑问副词when，where，how，why等。
1.主语从句主语从句在句中做主语。
它可以放在主句谓语动词之前，但多数情况由it作形式主语，而把主语从句放在主句之后。
例如：Who did that is known to all.It is interesting that you should like him.2.表语从句表语从句在句中作表语，位于主句中的系动词之后。
如：The question is who can complete the difficult task.表语从句不能用if引导，但可用as if引导。
例如：He looked as if he was going to cry．3.同位语从句同位语从句跟在名词后面，进一步说明该名词的具体内容。
引导同位语从句的名词主要有fact，news，promise，idea，truth等。
连接词用that（不用which），及连接副词how，when，where，why等。
例如：His delay is due to the fact that the car went wrong halfway．The news that our team has won the match is true.She asked the reason why there was a delay．4.宾语从句1.宾语从句在句中作及物动词或介词的宾语。
例如：We can learn what we did not know．He will talk to us about what he saw in the U.S.如果主句的谓语动词是及物动词make，find，see，hear等，则把宾语从句置于宾语补足语之后，用it作为形式宾语。
名词性从句复习注意：1.在名词性从句中，连接词的选择要根据从句的句意和上下文来确定。
2.当从句是陈述句时，通常使用连接词that（可省略，但在正式文体中建议保留）；当从句是疑问句时，通常使用whether/if（表示选择或疑问）或连接代词/副词（表示具体的疑问内容）。
3.在宾语从句中，当从句是特殊疑问句时，其语序要调整为陈述句语序。
4.同位语从句与定语从句的区别在于：同位语从句是对前面名词或代词的具体内容的阐述或解释，而定语从句则是对前面名词或代词的修饰和限定。
一、主语从句定义：在句子中充当主语成分的从句。
引导词：that, whether, if, who, whom, which, what, whose, how, when, where等。
使用原则：主语从句通常位于句首，用于描述句子的主要动作或状态的执行者或承受者。
它可以是陈述句、疑问句或祈使句（但祈使句作为主语从句的情况较少见）。
构成：主语从句通常由连接词that（可省略，但当从句中有疑问词或表示否定、强调等意义的词时，通常不省略）或whether/if（表示选择或疑问）引导，后面跟完整的句子结构。
例句：1.What he said made me think deeply.2.Whether he will come or not is still a mystery.3.How we can solve the problem is our main concern.4.That the earth moves around the sun is a well-known fact.5.Whoever breaks the law should be punished.练习题1._____ he said at the meeting surprised us all.A. WhatB. ThatC. HowD. Why2._____ you do, do it with all your heart.A. WhateverB. WheneverC. WhereverD. However3.It is _____ he often fails in exams that makes his parents worried.A. whatB. becauseC. thatD. why4._____ is known to all, the moon travels around the earth.A. AsB. WhichC. ThatD. What5._____ we should do next is still under discussion.A. WhatB. HowC. WhetherD. When答案：AAC（强调句结构）AA二、宾语从句定义：在句子中充当宾语成分的从句。
名词性从句知识清单一、名词性从句的分类1.主语从句：通常在句首，常有it充当形式主语。
2.宾语从句：在动词或介词后。
3.表语从句：在系动词后。
4.同位语从句：在抽象名词后。
二、各个连接词用法及意思。
引导词意思在从句中充当什么成分that 无意思不充当任何成分，只起连接作用whether/if 是否不充当任何成分，只起连接作用because 因为（表从）不充当任何成分，只起连接作用as if= as though好像（表从）不充当任何成分，只起连接作用连接代词what ….的东西；…的事；….的情况；….的话；…的地点；在从句中可充当主语，宾语或表语whatever 任何东西；任何事….在从句中可充当主语，宾语或表语who 谁在从句中可充当主语，whoever 无论谁 在从句中可充当主语， whom 谁（宾格） 在从句中可充当宾语或表语 whomever 无论谁（宾格） 在从句中可充当宾语或表语 which哪一个在从句中可充当主语，宾语或定语whichever 无论哪一个 在从句中可充当主语，宾语或定语whose 谁的 + 名词 在从句中可充当定语 how many 多少 how much多少引导词 意思 在从句中充当什么成分连接副词 when 什么时候 状语where什么地方 why 为什么 how怎样注1 ：whether 与if ：只有在及物动词后引导宾语从句，且不与or not 直接连用时，可以互换。
其余的主，宾，表，同位从句中都用whether. 注2：与how 和what 组合的疑问词也可以引导宾语从句 1. how old: 多大年纪2. how long: （1）多长（距离） （2）时间： 多久3. how often ： 多久一次4. how far :多远5.how deep : 多深6.how soon : 多久，多快（将来时）7.what color 什么颜色8.what size 什么大小码子9.what time 什么时候三、名词性从句中关于连接词的省略问题：只有that引导的宾语从句，且在及物动词后面可以省略，其余所有的连接词都不能省略。
高考英语一轮复习——名词性从句（附答案）I. 考点分析名词性从句包括：主语从句、宾语从句、表语从句、同位语从句，多由连词that，wh- 疑问词或由what，whatever等关系代词引导，其中同位语从句在高考考试中最常见。
1. 主语从句1) 主语从句在句子中充当主语，句子的谓语动词用第三人称单数。
如：Why he refused to work with you is still mystery.Whoever comes is welcome.2) 主语从句前的that不能省略，仅起连接作用，有时为了保持句子平衡，that从句后置，而由it作形式主语。
如：That he became a lawyer may have been due to his mother’s influence.It is not true that he has moved to New York.2. 宾语从句在句子中充当宾语，如：I don’t know where the sound came from.Don’t be satisfied with what you have achieved.3．当从句放在系动词be, look, remain, seem等后即构成表语从句。
The trouble is that I have lost his address.It seemed that the night would never end.4. 1) 同位语从句是对与之同位的名词中心词作进一步解释，能接名词性从句的常见名词有: idea, fact, news, belief, hope, evidence, opinion, problem, truth, answer, proposal, theory, decision, discovery, problem, thought, understanding 等。
高考英语一轮复习（语法）——名词性从句名词性从句包括：主语从句、表语从句、宾语从句和同位语从句。
引导名词性从句的连词有：A.连词：that, whether, if（这三个词都不作从句的成分，同时，that无含义，而whether和if都表“是否”）B.疑问代词：who, whom, whose, what, whichC.疑问副词：when, where, why, how（一）主语从句在复合句中充当主语的从句。
1.that引导主语从句that引导主语从句时不同于其他的连词，既无词义也不作成分，只起单纯的连接作用，且通常不可以省。
为了强调that引导的主语从句而置之于句首时，that不可省。
①That the driver could not control his car was obvious.②That she was chosen made us very happy.③That he will come is certain.④That he would take the risk is true.⑤That he should have married her isn't surprising.★通常，that引导主语从句时用it做形式主语，把从句置于句尾，此时that 有时可省。
例如：①It was obvious that the driver could not control his car.②It made us very happy that she was chosen.③It is certain that he will come.④It is true that he would take the risk.⑤It isn't surprising (that) he should have married her.★如果以that从句为主语的句子是疑问句，就只能用先行词it结构。
高考一轮复习--- 名词性从句I.什么是名词性从句?在句子中起名词作用的句子叫名词性从句。
名词从句的功能相当于名词词组, 它在复合句中能充当主语、宾语、介词宾语、表语、同位语等，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。
（判断下列划线部分属于哪种从句）You’ll find taxis waiting at the bus station that you can hire to reach your host family.That’s the new machine whose parts are too small to be seen.I don't believe we've met before, although I must say you do look familiar.What they have said made me happy.I am afraid of what will happen in 2012.My dream is that I will be a teacher one day.The topic that my parents are talking about is very interesting.●主语从句：（用横线划出句子中的主语从句）That he will come and help us is certain．Whether it is true remains a question.Who will do the job has not been decided．When we shall have our sports meet is still a question．用it作形式主语的that-从句有以下四种不同的搭配关系：a. It + be +形容词/名词+ that-从句It is certain that your son will do well in his exam．It is doubtful whether the manager knew the details of the plan．b.It + be +名词+ that-从句It is a pity that you didn’t attend the lecture yesterday．It is a surprise that he should win the first prize in the contest.c. It + be + -ed 分词+ that-从句It is said that the professor has already succeeded in carrying out this experiment．It is suggested that each student(should)sing a song in English．d. d. It +不及物动词+ that-分句It seems to me that you object to the plan．It happened that I was not there that day．It suddenly occurred to him that the keys might be left in the car．●宾语从句：（用横线划出句子中的宾语从句，并归纳其类型）Richard hopes (that) the teacher won’t ask him a question．The teacher suggested that we should call off the plan．Success depends on whether we make enough effort．I’m afraid that we can’t get to the airport on time.I’m sure that he’ll win the match..想一想：哪些词后面可能跟宾语从句呢？I think it important that young people master two languages．I consider it necessary that he should improve his pronunciation.I would appreciate it if you could give me the chance.I hate it when someone is talking with their mouth full.You can depend on it that he can manage it.I am counting on it that you will come．She took it for granted that you knew the matter．See to it that the door is safely locked before you go．●表语从句（用横线划出句子中的表语从句，并归纳其类型）My decision is that all of us are to start at 6 o’clock tomorrow morning.The patient looked as if he had been ill for a long time．The reason why she called me is that she will not attend the party．His suggestion is that we(should)set off at once．●同位语从句定义：放在belief; fact; hope; idea; news; report; message; opinion; possibility; problem; suggestion等抽象名词后，用来对这些名词的具体内容作进一步的解释说明，多用that 引导。
The news that he intended to come gave us much pleasure．An idea occurred to him that he might go there by air．也有使用wh- 的情况。
I have no idea ___________ they are coming.Do you have any idea ___________is actually going on in the classroom?I have some doubt ____________they can finish it on time.The problem ____________ you are going to give up the plan has not been answered yet.引导名词性从句的连接词：1）连词：that（无任何词意），whether, if, as if, as though2）连接代词：what, whatever, who, whoever, whose, which, whichever, whom, whomever3）连接副词：when, where, how, why, how many, how muchII. 名词性从句考点归纳：考点之一：考查that 与whate.g. 1. _____we can't get seems better than ______we have.A. What ; whatB. What ; thatC. That ; thatD. That ; what分析：在名词性从句中that 与what 的区别是：that 在名词性从句中不作句子成分，没有意义，只起连接作用；而what 在名词性从句中不仅起连接作用，而且充当句子成分，并代替某事物。
句子的意思是：我们得不到的似乎比我们已经拥有的要好。
此题考查了两个名词性从句：主语从句和宾语从句，what 在这两个名词性从句中都作宾语。
1. Little Tommy was reluctant to tell the schoolmaster ________he had done the day before．A．that B．how C．where D．what2. _______ caused the accident is still a complete mystery.A. WhatB. ThatC. HowD. Where3. _______ the 31th Olympic Games will be held in Rio is well known.A. /B. WheneverC. WhatD. That4. It has been proved ________eating vegetables in childhood helps to protect you against serious illnesses in later life．A．if B．because C. when D．that但除that 外的其他连接词往往有自己的词意，所以要认真读题弄明白句子的逻辑关系。
1. We don’t doubt ______he’ll give us much help. ______we doubt is _______he’ll come on time.A. whether；That；whenB. that；What；whetherC. whether；What；ifD. that；Why；whether2. We cannot figure out _______ quite a number of insects, birds, and animals are dying out.A. thatB. asC. whyD. when3. He didn’t see the film last night. That is _______he had to help his little sister with her homework.A. whyB. becauseC. thatD. how4. Tomorrow is Tom’s birthday. Have you got any idea _______ the party is to be held?A. whatB. whichC. thatD. where5. Parents are taught to understand _______ important education is to their children’s future.A. thatB. howC. suchD. so考点之二：考查it 作形式主语或形式宾语e.g. ____ is a fact that English is being accepted as an international language.A. ThereB. ThisC. ThatD. It分析：为了保持句子的平衡，往往用it 作形式主语或形式宾语，而把真正的主语从句或宾语从句放到后面，尤其是that 引导的主语从句往往用it 作形式主语。
