(完整版)高考名词性从句详解
高考名词性从句目录一、引导名词性从句的连接词二. 主语从句三、宾语从句四、表语从句五. 同位语从句六、名词性that-从句七、名词性wh-从句八、否定转移九、高考热点透视十、专项考点练习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。
一、引导名词性从句的连接词二.主语从句What he wants to tell us is not clear.Who will win the match is still unknown.Where the English evening will be held has not yet been announced.注意：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 从句当堂练习：（1）It is immediately clear ____ the financial crisis will soon be over.（2）____ was most important to her, she told me, was her family.（3）watch was lost is unknown.（4）he finished writing the composition in such a short time surprised us all.三、宾语从句We must never think (that) we are good in everything while others are good in nothing.He has told me that he will go to Shanghai tomorrow.（由连接词that引导宾语从句时，that在句中不担任任何成分，在口语或非正式的文体中常被省去，但如从句是并列句时,第二个分句前的that不可省。
）I want to know what he has told you.注意：当think, believe, imagine, suppose等等动词引起的否定性宾语从句中，要把上述主句中的动词变为否定式。
即将从句中的否定形式移到主句中。
例如：We don’t think you are here. 我们认为你不在这。
I don’t believe he will do so. 我相信他不会这样做。
当堂练习：（1）（2）She always thinks of she can work well.（3）She will give四、表语从句The fact is that we have lost the game.That’s just what I want.The reason why he was late was that he missed the train by one minute this morning .当堂练习：（1（2）He has become he wanted to be ten years ago.（3）You are saying that everyone should be equal, and this is ____ I disagree.五. 同位语从句同位语从句说明其前面的名词的具体内容。
同位语从句通常由that引导，可用于同位语从句的名词有advice doubt、fact、hope、idea、information、message、news、order、problem、question suggestion、truth、wish、word等。
The news that we won the game is exciting.I have no idea when he will come back home. 我不知道他什么时候回来。
当堂练习：’science.六、名词性that-从句1）由从属连词that引导的从句叫做名词性that-从句。
That只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。
名词性that-从句在句中能充当主语、宾语、表语、同位语和形容词宾语，例如：主语：That he is still alive is sheer(纯粹的) luck.他还活着全靠运气。
宾语：John said that he was leaving for London on Wednesday.约翰说他星期三要到伦敦去。
表语：The fact is that he has not been seen recently.事实是近来谁也没有见过他。
同位语：近来谁也没有见过他，这一事实令办公室所有的人不安。
形容词宾语：I am glad that you are satisfied with your job.你对工作满意我感到很高兴。
2）That-从句作主语通常用it作先行词，而将that-从句置于句末，例如：It is quite clear that the whole project is doomed to failure.很清楚，整个计划注定要失败。
It's a pity that you should have to leave.你非走不可真是件憾事。
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+ 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……b. It + be + -ed 分词+ that-从句It is believed that…人们相信……It is known to all that…从所周知……It has been decided that…已决定……c. It + be +名词+ 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……d. It +不及物动词+ that-分句It appears that…似乎……It happens that…碰巧………我突然想起……七、名词性wh-从句1）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，例如：主语：How the book will sell depends on its author.书销售如何取决于作者本人。
直接宾语：In one's own home one can do what one likes.在自己家里可以随心所欲。
间接宾语：俱乐部将给得胜者设奖。
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. 她高兴给他起什么名字就取什么名字。
同位语：I have no idea when he will return.我不知道他什么时候回来。
形容词宾语：I'm not sure why she refused their invitation.我尚不能肯定她为什么拒绝他们的邀请。
介词宾语：That depends on where we shall go.那取决于我们去哪儿。
2）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。
八、否定转移（阅读了解）1) 将等动词后面宾语从句的否定词转移到主句中，即主句的谓语动词用否定式，而从句的谓语动词用肯定式。
I don't think I know you.我想我并不认识你。
I don' t believe he will come.我相信他不回来。
注意：若谓语动词为hope,宾语从句中的否定词不能转移。
I hope you weren't ill. 我想你没有生病吧。
2) 将seem, appear 等后的从句的否定转移到前面。
It doesn't seem that they know where to go.看来他们不知道往哪去。
It doesn't appear that we'll have a sunny day tomorrow.看来我们明天不会碰上好天气。
3) 有时将动名词，介词短语或整个从句的否定转变为对谓语动词的否定。
I don't remember having ever seen such a man.我记得从未见过这样一个人。
(not否定动名词短语having…)在这里，人们不会想到在街上会碰上陌生的人。
(anyone 作主语，从句中的谓语动词不能用否定形式。
)4) 有时状语或状语从句中否定可以转移到谓语动词前。
The ant is not gathering this for itself alone.(否定状语)蚂蚁不只是为自己采食。
He was not ready to believe something just because Aristotle said so. (否定because状语) 他并不因亚里斯多德说过如何如何，就轻信此事。
She had not been married many weeks when that man's younger brother saw her and was struck by her beauty.(否定状语many weeks)她结婚还不到几个月，这个人的弟弟就看见她了，并对她的美貌着了迷。
(完整版)名词性从句讲解及专项练习习题及其解答
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。
高考英语名词性从句讲解(版) PPT
复合句：主句+引导词+从句
定语从句
复合句 名词性从句
状语从句
请思考 定语从句的定义：
起定语作用，用来修饰名词或代词的从句。
名词性从句定义
起名词性作用的从句，叫名词性从句。 换言之，在英语的句子结构中，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。
大家有疑问的，可以询问和交流
可以互相讨论下，但要小声点
3. We love peace.
(名词作宾语)
4. He said that he has known all before.
(从句作宾语)
2. 在句中充当及物动词或介词或be+adj.后宾 语的从句叫做宾语从句。
We always mean what we say.我们向来说话算数。
7.Miss. Liang , a 24-year-old girl, teaches us
English .
(名词作同位语)
8.The news that our team had won made us happy.
(从句作同位语)
4. 在句中用作同位语的从句叫做同位语从句. 其用途是对前面的名词作进一步解释，说明 该名词的具体内容。可以跟同位语从句的名词 通常是news,idea,fact,word,hope,advice等。
(同位语从句)
2. The news that they _w__o__n__ the game s__p__r_e__a__d__
the whole school.
(宾语从句)
3. I _d__o__n_’_t__t_h__i_n__k_ that he i_s_ an honest boy.
高考英语名词性从句讲解(最全版)
名词性从句引导词的用法（3）：
“whoever”-- “-----的任何人”、作主语、 “whomever”-- “-----的任何人”、作宾语、 “whatever”-- “----的任何东西”、作主表宾语、 “whichever”--- “无论哪个或哪些---”、作定语、
连接代词
“whoever”-- “---的任何人”、作主语、起连接作用
（宾语从句）
“whichever”-- “--的哪些或哪个”、作主、表、宾语、
1、Whichever team win the game is possible .
（主语从句）
2、The fact is whichever teacher could help you learn English well . （表语从句） 3、You could choose whichever book you want .
certain （主语从句） .
2、The fact is that Beijing will hold 29th Olympic
Games this year. （表语从句）
3、I know that well begun is half done . （宾语从句） 4、He heard the news that Liuxiang set a new world record .（同位语从句）
“who”---“谁”、作主语、起连接作用 “whom”---“谁”、作宾语、起连接作用
连接代词
“what”---“事情”、作主表宾、起连接作用 “which”---“哪----”、作定语、起连接作用 “whose”---“谁的”、作定语、起连接作用
“who”---“谁”、作主语、起连接作用
2023年高中英语语法：名词性从句用法详解及强化练习分析
2023年高中英语语法：名词性从句用法详解及强化练习分析名词性从句分类简述名词性从句，就是指其作用相当于名词的从句，它包括主语从句、表语从句、宾语从句和同位语从句。
一、主语从句1. 引导词：主语从句就是在复合句中用作主语的从句，引导主语从句的引导词主要有三类：一是that;二是whether;三是那些可以用作疑问词的词语，如what, who, which, when, where, how, why 等。
如：That we shall be late is certain. 我们要晚了，这是确定无疑的。
What he says is not important. 他说的话并不重要。
Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
2. 形式主语：有时为了避免句子显得“头重脚轻”，可用it作形式主语放在句首，而把真正的主语放在句末。
如：It’s a pity that he didn’t come. 很遗憾他没来。
It was uncertain whether he could come or not. 他是否会来还不肯定。
这三句句首的it均为形式主语，相应的真主语分别是that he didn’t come / what she did / whether he could come or not。
二、表语从句表语从句就是在复合句中用作表语的从句。
一般说来，可用于引导主语从句的引导词也可用于引导表语从句，如that, what, who, which, when, where, how, why, whether等。
如：My idea is that we should do it right away. 我的意见是马上就干。
That is what he meant. 这就是他的意思。
The problem is how we can find him. 问题是我们如何找到他。
名词性从句完整版
壹
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。
04
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)
1
2
3
4
5
6
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
高考英语名词性从句讲解 版
名词性从句
主语从句 宾语从句 表语从句 同位语从句
在英语的句子结构中，如果本该由名词充当的主语、
宾语、表语和同位语，由一个句子来充当，那么这 个句子就叫_名__词__性__从__句_。
请判断出下列的句子属于哪种从句： (主语从句)
1.What I _w___a_n__t_ to do i_s to go shopping.
record .（同位语从句）
“whether”---“是否”、不作成份、起连接作用
1、Whether she will come back on time depends on
weather（. 主语从句）
2、The problem is whether you could give us some
引导词
从属连词（3个）：that 、if、 whether
连接代词 （9个）：who、 whom 、 what、 which、 whose、 whoever whomever、 whatever、 whichever、
连接副词（4个）：when、 why、 where、 how
名词性从句引导词的用法（1）：
的内容：我们队取得了决赛胜利。）
The news that you told us is really encouraging.
（从句对“消息”加以限定：是你告诉我们的，而非 来自其他渠道。但消息是何内容却不得而知。）
二、同位语从句与定语从句的不同之处
2、引导词 区别：同位语从句中，that：无成分，用于 肯定句； 定语从句的that是关系代词，既指代先行词又须在从句 中充当成分。
英语名词性从句
Noun Clause
Review: 英语句子的种类有两种，按句子的用途
英语名词性从句讲解【完整版】
2、I asked him if he could do me a favor .
If与whether的区别：
1、If不能引导放于句首的主语从句，而whether可以。 2、引导表语从句用whether，不用if。 3、引导同位语从句用whether，不用if。 4、whether可以引导从句作介词的宾语，不用if 。 5、whether or not 连在一起可以，但if不可以。而 “whether-----or not = if -----or not”
同位语从句：
定义：在复合句中充当同位语的句子。 同位语从句用来对其前面的抽象名词进行解释说明，被解释说明的词和 同位语在逻辑上是主表关系。 同位语常见名词：fact, suggestion, advice, idea, decision, news, thought, hope, belief, truth, doubt, promise, possibility, truth, warning, message, reason, report, question，explanation, wish, problem等。 常见的连接词：that, whether, what, who, how, when, where等。 用法： The thought that I want to buy my mother a birthday gift makes me excited.that 引导的同位语从句，解释说明 thought，从句不缺成 分 There is some doubt whether he will come. whether 引导同位语从句，if 不能引导同位语从句 we haven’t made the decision where we are going to spend our vacation. 有时同位语从句可以不紧跟解释说明的名词后面。 The news is surprising that he won the match.
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。
完整版)名词性从句用法归纳
完整版)名词性从句用法归纳名词性从句是指在句子中作名词角色的句子，可以充当主语、宾语、表语、同位语、介词宾语等。
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。
引导名词性从句的连接词可以分为三类。
第一类是从属连词，包括that、whether和if。
在宾语从句或表语从句中，that 有时可以省略。
第二类是连接代词，包括what、who、which 等。
这些代词在从句中做成分，不可以省略。
第三类是连接副词，如when、where、how等，也不可以省略。
在一些情况下，that可以省略，如定语从句中做宾语、引导宾语从句或表语从句时。
但在定语从句中做主语、由that引导同位语从句时，以及宾语从句中真正的that不可以省略的情况下，that不能省略。
主语从句是指作句子主语的从句。
主语从句通常由从属连词that、whether等，连接代词what、who、which等，以及连接副词how、when、where等引导。
2、连接词的使用：连接词在句子中起到连接的作用，其中that在句子中没有实际的意义，只是起到连接从句和主句的作用。
而连接代词和连接副词则在句子中既保留了自己的疑问含义，又起到连接从句和主句的作用，同时在从句中充当从句的成分。
例如，whom和who指人，what指物，而XXX和whoever则表示泛指意义。
举个例子，What he wants to tell us is not clear.表示他想告诉我们什么并不清楚。
另外，为了避免句子头重脚轻的情况，有时我们会用形式主语it代替主语从句，并将主语从句放在句末。
这种情况下，主语从句后的谓语动词一般使用单数形式。
常用的句型有：（1）It + be +名词+ that从句，如It is a fact that（事实是）；（2）It + be +动词的过去分词+ that从句，如It is said that（据说）；（3）It +不及物动词（vi）+ that从句，如It seems that （似乎）；（4）It + be +形容词+ that从句，如It is naturalthat（很自然）。
高考英语名词性从句讲解
If与whether的区别：
1、If不能引导放于句首的主语从句，而whether可以。 2、引导表语从句用whether，不用if。 3、引导同位语从句用whether，不用if。 4、whether可以引导从句作介词的宾语，不用if 。 5、whether or not 连在一起可以，但if不可以。而 “whether-----or not = if -----or not”
表语从句
“whether”---“是否”、不作成份、起连接作用
1、Whether she will come back on time depends on
weather（. 主语从句）
2、The problem is whether you could give us some
valuable advice（. 表语从句）（宾语从句）
（宾语从句）
“whom”---“谁”、作宾语、起连接作 用
1、Whom you will learn from is worth thinking over .
（主语从句）
2、The thing I am anxious about is whom he will turn
to for help .
{ 主语 What he does is important.
{ 表语 This is his job. This is what he does every day.
{ 宾语
I don’t like his job. I don’t like what he does every day.
{I don’t know about the man, Mr. White.