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2023年高中英语语法名词性从句精讲之：四大从句用法大全主语从句主语从句的概念：如果一个句子在复合句中充当一个主语，那么这个句子就是主语从句。
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。
主语从句用法：1、主语从句的引导词：主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导：如：That he is still alive is a wonder. 他还活着，真是奇迹。
When we arrive doesn't matter. 什么时候到没有关系。
What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
2、主语从句与形式主语it：有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。
这分三种情况：(1)对于以连词that引导的主语从句，通常用形式主语代主语从句：如：It's a pity that he didn't come. 很遗憾他没来。
(2)对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：如：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
It was a problem whether they would support us. 他们是否会支持我们还是一个问题。
(3)对关系代词型what引导的主语从句，通常不用形式主语，总是主语从句放在句首：如：What we need is money. 我们需要的是钱。
高三英语语法复习---名词性从句一、概说名词性从句，即指性质相当于名词的从句，它包括主语从句、宾语从句、表语从句和同位语从句。
名词性从句的连接词的选用依据“从句缺什么成分补什么成分”的原则。
解题时，应首先确定选用连接代词还是连接副词。
然后再根据题意选用具体的连接词。
如果名词性从句中缺少主语、宾语、表语或定语，则选用连接代词。
如果从句中缺少状语，则选用连接副词。
如果从句中不缺成分，而仅表示陈述事实，则用that引导。
如果含有“是否”意义，则选用whether或if。
二、名词性从句的一般引导词1.连接词that 只起连接作用，没有任何意思，也不充当句子成分，在宾语从句中可省略，但引导其他名词性从句时通常不省略。
如：I hope (that) you enjoy your holiday. 希望你假期过得好。
That he likes you is very obvious. 很显然他喜欢你。
2.连接词whether 也不充当句子成分，但有自己的意思，表示“是否”；引导宾语从句时，可换成if，但引导其他名词性从句时不能换成if。
He asked whether [if] I would show him the way. 他问我是否可以给他带路。
Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
(引导主语从句，不能用if 代替whether)3.连接代词who(m), whose, which, what 等，均有各自的意义，在从句中作主语、宾语、定语等。
如：That’s why she wanted to leave. 这就是她想离开的原因。
When we arrive doesn't matter. 什么时候到没有关系。
Tell me which one you like best. 告诉我你最喜欢哪一个。
4.连接副词when, where, why, how 等，也各自有自己的意义，在从句中作状语。
名词性从句1.定义起名词性作用的从句，叫名词性从句。
换言之，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。
主语从句His job is important(What he does) is important.宾语从句I like his job.I like (what he does every day).表语从句This is his job.This is (what he does every day).同位语从句I know Tom, our monitor.I know the fact (that Lucy is married).2.分类名词性从句包括四大从句：主语从句，宾语从句，表语从句和同位语从句。
3.结构（常见）主语从句：(连接词引导的句子)+谓语+（宾语）宾语从句：主语+谓语+(连接词引导的句子)或者介词+（连接词引导的句子）表语从句：主语+系动词+（连接词引导的句子）同位语从句：抽象名词+（连接词引导的句子）4.起止点起点:1）通常是从连接词开始。
2）连接词that省略时，从第二个主语开始。
名词性从句的止点止点:1）通常是连接词词后面的标点符号。
2）连接词后面的第二个谓语动词前。
I believe I can fly.My idea is that we should do it right now.Whether she will come back on time depends on weather .I knew the news that our team won the match.Who will go to the college is still uncertain.They agree with what I said just now .宾语从句3. 宾语从句概念从句在主句中作宾语4.宾语从句的分类1）动词后宾语从句结构：①及物动词+宾语从句②及物动词+宾语1+宾语从句I know that well begun is half done .He promised us that he would offer us more assists later on.He has informed me when he is to solve the problem.注:谓语动词通常为接双宾语的及物动词,如tell, give, inform等,结构通常为v.+ sb. + sth.考查形式为：“v. +( v.+其它)”All of us have already known she will choose is the opportunity to go abroad2）介词后宾语从句结构：介词+宾语从句We are not interested in whether you will agree with us about who will win the game.When you are reading, make a note of what you think is of great importance.注: 在介词后的宾语从句中，连接词that不可以省略。
专题04 名词性从句考点讲义（解析版）讲义目录1.【名词性从句高考考点细目表】P22.【名词性从句命题规律】P23.【名词性从句备考策略】P24.【名词性从句命题预测】P35.【名词性从句思维导图】P3【名词性从句考点梳理】6.考点清单一、名词性从句的种类、语法功能和引导词P47.考点清单二、主语从句P48.考点清单三、宾语从句P69.考点清单四、表语从句P710.考点清单五、同位语从句P711.考点清单六、同位语从句与定语从句的区别P8分类训练（一）【高考真题回顾18题】P9分类训练（二）【高考模拟试题14题】P12 1.【近年高考真题从句考点细目表】13次，主要考查：1.表语从句引导词的考查出现4次。
2.宾语从句引导词的考查出现5次。
3.同位语从句引导词的考查出现2次。
4.主语从句引导词的考查出现2 次。
It is believed that ... it作形式主语，that引导的从句作真正的主语。
3.【名词性从句从句备考策略】系统归类表语从句、宾语从句、同位语从句和主语从句的用法，尤其是这些从句的引导词的用法；熟练掌握表语从句、宾语从句的相关考点。
4.【名词性从句从句命题预测】2024年语法填空对名词性从句的考查仍是重点，主要集中考查名词性从句的引导词的用法，如连接词that和what的用法、whatever 和whichever、if和whether等。
5.【名词性从句思维导图】【名词性从句从句考点梳理】6.考点清单一、名词性从句的种类、语法功能和引导词英语中从句主要分为三种：名词性从句（用从句代替名词）、定语从句（用从句代替形容词）、状语从句（用从句代替副词）。
名词性从句就是指从句在主句中充当名词成分，其功能相当于名词性词组。
1）根据从句在句子中不同的语法功能，名词性从句可分为：主语从句、宾语从句、表语从句和同位语从句。
2）根据名词性从句的引导词不同，可分为：that从句、if/whether从句和wh引导的疑问句（who/whom/whose/whoever/what/whatever/which/whichever/where/when/how/why等）。
高考英语名词性从句语法知识点讲解高考英语名词性从句语法学问点讲解名词性从句指充当名词成分的从句，下分许多类型，是英语学习的重点，详细都有哪些学问点呢?我整理了相关资料，盼望能关心到您。
主语从句宾语从句表语从句同位语从句作及物动词宾语作介词宾语that一般不省略可以省略一般不省略一般不省略一般不省略Whether/if(是否)放于句首时只用whether用whether/if均可，但有区分只用whether只用whether只用whether特别疑问词留意语序要用陈述语序名词性关系从句留意语序要用陈述语序一、that 从句1、主语从句(1)that从句作主语时，常用it作形式主语，常见的句型有：It+be+形容词(obvious, true, natural,surprising,good,wonderful,funny,possible,likely,certain,pro bable,etc.)+that从句It+be+名词词组(no wonder, an honor, a good thing, a pity, no surprise, etc.)+that从句It+be+过去分词(said, reported, thought, expected, decided, announced, arranged, etc.)+that从句(2)that可以省略，但that从句位于句首时，that不能省略。
2、宾语从句(1)常见的可以接that从句作宾语的动词有see, say, know, imagine, discover, believe, tell, show, think, consider, be sure, be afraid等。
在可以接复合宾语的动词之后，如think, make, consider等，可以用it作形式宾语。
(2)That从句一般不能充当介词宾语，间或可作except, in 的宾语。
名词性从句一、名词性从句的结构和功能总述名词性从句是在句子中充当名词作用的从句，包括主语从句、宾语从句、表语从句和同位语从句。
名词性从句主要以that、whether／if、who、whom、where、why、how 和what或wh－ever等引导。
此外，as if／as though也可引导语从句。
三、四类名词性从句主语从句在复合句中充当主语的句子叫做主语从句。
引导主语从句的词有连词that, whether, 连接代词who, what which; 连接副词when, where, how, why等。
如：That he will succeed is certain.Whether wild life can be well protected is of great importance.Who will go makes no difference.Which kind of food is the best is still not certain.What is needed for the space trip is careful preparation.Whoever comes is welcome.How we can help the twins will be discussed at the meeting.When they’ll start the project has not been decided yet.Where he hid the money is to be found out.Why dinosaurs died out remains a puzzle.1. that从句作主语时，常用it作形式主语，常见的句型有：It+be+形容词（obvious, true, natural, surprising ,wonderful, likely, certain, ….）+that从句It is doubtful whether she will be able to come.她是否能来令人怀疑。
高考英语语法复习名词性从句知识讲解一、与定语从句区别它们的性质不同，一个是名词，而另一个是形容词性。
名词性从句是独立的，而定语从句必须要依附先行词（相当于寄身虫）。
有时名词性从句可以转换成定语从句（必须加先行词）。
比如：What he said = The things that he said二、构成构成一个名词性从句就像是对一个陈述句进行特殊疑问句的提问，只不过不颠倒语序，如：He said something.What he said （名词性从句）What did he say? (特殊疑问句)三、分类（一）根据从句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四种。
（二）根据引导名词性从句的连接词可分为三类：1.连接词： that, whether, if （不充当从句的任何成分）2.连接代词：who, what, which, whose, whoever, whichever, whomever, whatever3.连接副词：where, when, why, how (how much, how long…), wherever, whenever, however1.主语从句【例句】1.That prices will go up is certain.= It is certain that prices will go up.2.How you travel means the difference between success and failure.3.Whether we go by train or by boat makes no difference.4.Who will write the poem has not been decided yet.5.What surprised us is that he lost in the game.6.What he left us was a large sum of money.7.When he will be back depends on the weather.8.Where we live doesn’t matter.9.How the pyramids were built was still a mystery.10.Watever he did is right.11.Whoever comes will be welcome.12.Whichever you want is yours.【注意点】That引导的主语从句中，that不能省略。
专题名词性从句框架结构图名词性从句(主语从句、宾语从句、表语从句、同位语从句)中的连接词名词性从句中的连接词有从属连词等，连接代词等，连接副词等。
的用法：()主语从句、表语从句、同位语从句中用但不能省略。
.’ ..()一般情况下，宾语从句中的引导词可省略，但在以下几种情况中一般不省略：①当从句和主句谓语动词之间有插入语时；②有多个引导的从句时，第一个可以省略，而其他的常不可省略；③介词，，，等后跟引导的宾语从句时；④当，，，，，等引导的从句与引导的从句作主句谓语动词的并列宾语时。
，， ...()和的区别。
引导名词性从句时，在主从句中不担当任何句子成分，也没有任何含义；而引导名词性从句时，在主从句中都要充当一定的句子成分，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＋”。
’ .() .()同位语从句与定语从句中的区别。
同位语从句中的连接词只起连接作用，在从句中不担当任何句子成分；而定语从句中的关系代词在句中作宾语或主语，与先行词有修饰关系。
如果句子是同位语从句，就应用连接词而不能用。
同位语从句一般放在表具体含义的名词后解释说明名词的含义或内容，如以下名词：，，，，，，，，等，而定语从句只是对先行词的限定和修饰。
.(同位语从句).(定语从句)和的用法：()和在宾语从句中可以互换，但是作介词宾语时连接词一般用。
.()后面直接跟时用。
’ .()主语从句、表语从句中只能用。
..()可以引导同位语从句，用以说明前面的名词的内容，则不能。
.()常与连用表示一种选择，不能这样用；也可与动词不定式连用，但不能。
..()宾语从句位于句首时或者宾语从句提前时用不用。
，’ ’ .()可引导一个让步状语从句表示“不管”、“无论”，而不能。
， ..“疑问词＋”和“ ＋疑问词”的区别：()“疑问词＋”可引导名词性从句，在主从句中要充当一定的成分。
..()“疑问词＋”还可引导让步状语从句。
， .， .()“ ＋疑问词”只能引导让步状语从句。
2021高三英语新高考语法复习讲义名词性从句【解题思路1.名词性从句的分类和特征(四大从句：主语从句、表语从句、宾语从句、同位语从句)。
2.仔细分析从句结构，看从句是否完整(先看结构，再看意义)。
3.根据“缺什么补什么”的原则，确定恰当的连接词。
【掌握三大常考点1.连接副词引导的名词性从句。
2.that引导的名词性从句。
3.what引导的名词性从句。
明辨五大易错点】1.that与what的误用。
2.that与if/whethe r的误用。
3.which与tha t，whic h与wha t的误用。
4.if与whether的误用。
5.that，what与连接副词的误用。
【高考真题】1.Scientists have obtained more evidence plastic is finding its way into the human body.2.By boat is the only way to get here，which is__________ we arrived.3.Without his support，we wouldn't be we are now.4.The gold medal will be awarded to wins the first place in the bicycle race.5.Every year，_________ makes the most beautiful kite will win a prize in the Kite Festival.6.She asked me I had returned the books to the library，and I admitted that I hadn't.7.It is often the case anything is possible for those who hang on to hope.8.People who can see with their eyes can't understand _____practical use Braille can be of for the blind.9.Part of the reason why Charles Dickens loved his own novel，Da v id Copperfield，was _____ it was rather closely modeled on his own life.10.The only way to succeed at the highest level is to have total belief________ you are better than anyone else on the sports field.11.I have no idea________ the cell phone isn't working，so could you fix it for me?12 It is still under discussion the old bus station should be replaced with a modern hotel or not.13.—I rang you at about nine，but there was no reply.—Oh，that was probably_________ I was seeing the doctor.14.In fact，I wonder my efforts were all in vain.15.The little girl who got lost decided to remain she was and wait for her mother.16.As a new diplomat，he often thinks of ______ he can react more appropriately on such occasions.17.Your support is important to our work. you can do helps.18.I won't have anyone smoking in here. breaks the regulation will get punished.【考点归纳一what和that引导的名词性从句1.what引导名词性从句的五种用法：(1)表示“……的东西或事情”：They've done what they can to help her. 他们已经尽力帮助了她。
高中英语名词性从句讲义(超详细版)一．定义：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。
1. His words are true. What he said is true.2. The dog sensed something good. The dog sensed that there was something good nearby.3. These are his words. These are what he said.4. My Maths teacher, Mr He, is a kind person. The news that the plane had crashed made us sad.二．引导名词性从句的连接词连词：在从句中不充当成分，只起连接作用 that, 无实义whether, if 是否as if \ as though 似乎，好像连接代词：有词义，在句中担任主语，表语，定语或宾语。
what, 什么 who, 谁whom, 谁，作宾语 whose, 谁的 which, 哪一个whatever, whoever……也可以引导。
连接副词：有词义，在句中担任状语。
when ,什么时候 where, 什么地方 why, 为什么 how ,怎么样how many, how much, how often三．主语从句1. 作句子主语的从句叫主语从句。
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。
202X届高考英语语法名词性从句精讲之四大从句用法大全讲义从句是语法中的一种句子结构，可以在句子中作为名词、形容词、副词的成分。
名词性从句是从句中的名词成分，包括主语从句、宾语从句、表语从句和同位语从句。
下面是四种名词性从句的用法大全讲义：一、主语从句（Subject Clause）1. 主语从句在句子中作主语成分，引导词有以下几种：- that- whether- who- whom- which- whose- what- whatever例如：- That he will come is certain.（that引导）- Whether he will come is uncertain.（whether引导）- Who will come is still unknown.（who引导）- What he said is true.（what引导）2. 主语从句在句子中常出现于以下几个句型中：- It + be + 形容词 + that从句- It + be + 名词 + that从句- It + be + 动词 + 在时间、地点或是方法上的状语 + that从句第1页/共5页例如：- It is important that we learn English well.- It is a pity that he can't come to the party.- It is necessary that we take action to protect the environment.二、宾语从句（Object Clause）1. 宾语从句在句子中作宾语成分，引导词有以下几种：- that- whether- if- who- whom- which- whose- what- whatever例如：- I know that he is a good student.（that引导）- I wonder whether he will come.（whether引导）- I don't know if he will come.（if引导）2. 宾语从句常跟以下动词或动词短语连用：- think- believe- know- understand- wonder- ask- tell- hope- decide- remember- forget- hear- see- want- like- love- hate例如：- I think that he is a good student.- He told me that he can't come to the party.三、表语从句（Predicate Noun Clause）1. 表语从句在句子中作表语成分，引导词有以下几种： - that- whether- who- whom- which- whose- what例如：第3页/共5页- The problem is whether we should help him or not.（whether引导）- His dream is that he can travel around the world.（that引导）2. 表语从句常跟以下系动词连用：- be- seem- appear- feel- look- sound- become- remain- stay例如：- She is worried that she can't pass the exam.- The flowers smell nice.四、同位语从句（Appositive Clause）1. 同位语从句是对主句中的名词进行解释或补充说明，引导词有以下几种：- that- whether- who- whom- which- whose- what例如：- The fact that he passed the exam is not surprising.（that引导）- The question is whether he will come.（whether引导）2. 同位语从句通常出现在以下几种句型中：- Noun + is + 同位语从句- 同位语从句 + 后置定语例如：- The problem is how to solve it.- My belief is that hard work pays off.以上是四种名词性从句的用法大全讲义，希望对你有所帮助！第5页/共5页。
千里之行，始于足下。
202X届高考英语语法名词性从句精讲之四大从句用法大全讲义名词性从句是英语语法中的一个重要部分，经常消灭在句子中作为主语、宾语、表语、同位语等成分。
在高考英语中，名词性从句经常消灭在阅读理解、完形填空和翻译等题型中。
下面是四种常见的名词性从句的用法及例句解析。
1. 主语从句主语从句是一个名词性从句，它在句子中作主语。
主语从句通常由连接词that引导，但在口语和日常写作中，经常可以省略。
例句：That he is guilty is obvious.（他有罪是明显的。
）Why he left so early is a mystery.（他为什么那么早离开，真是个谜。
）2. 宾语从句宾语从句是一个名词性从句，它在句子中作宾语。
宾语从句通常由连接词that引导，但在口语和日常写作中，也可以使用其他连接词如if, whether, who, whom, whose, which, when, where, why等。
例句：I know that he is my brother.（我知道他是我哥哥。
）She asked me whether/ if I had finished my homework.（她问我是否完成了作业。
）3. 表语从句第1页/共2页锲而不舍，金石可镂。
表语从句是一个名词性从句，它在句子中作表语。
表语从句通常由连接词that引导，但在口语和日常写作中，经常可以省略。
例句：The fact that he is a doctor surprises me.（他是个医生这个事实让我感到惊异。
）4. 同位语从句同位语从句是一个名词性从句，它在句子中同其他名词一起充当同位成分，对前面的名词进行解释或说明。
同位语从句通常由连接词that引导。
同位语从句常用来解释或说明名词的内容、定义、解释、后果、缘由、依据等。
例句：The fact that he failed the exam surprised us all.（他考试失败这个事实让我们全部人都感到惊异。
专题2 名词性从句框架结构图名词性从句(主语从句、宾语从句、表语从句、同位语从句)中的连接词名词性从句中的连接词有从属连词that/whether/if等，连接代词what/who/which/whose/whatever/whoever/whomever/whichever等，连接副词where/when/why/how/wherever/whenever等。
1.that的用法：(1)主语从句、表语从句、同位语从句中用that但不能省略。
That they are good at English is known to us all.The problem is that we don’t have enough money.The report that there will be a severe storm in the northern area is false.(2)一般情况下，宾语从句中的引导词that可省略，但在以下几种情况中that一般不省略：①当that从句和主句谓语动词之间有插入语时；②有多个that引导的从句时，第一个that 可以省略，而其他的that常不可省略；③介词except，but，besides，in等后跟that引导的宾语从句时；④当when，who，what，where，why，how等引导的从句与that引导的从句作主句谓语动词的并列宾语时。
He judged that，because he was a child，he did not understand wine.The reason lies in that she works harder than the others do.Everyone knew what happened and that she was worried.(3)that和what的区别。
that引导名词性从句时，在主从句中不担当任何句子成分，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/which/who”。
名词性从句和定语从句一．名词性从句名词性从句可分为主语从句、宾语从句、表语从句和同位语从句，相当于一个名词的功能。
近几年高考对名词性从句的考查重点如下：【考点】名词性从句中引导词whether与if 的用法区别。
引导及物动词或形容词后的宾语从句可以互换的场合： He is not sure if / whether he can manage to do it.当与or not分开使用时He wondered if / whether we will attend the meeting or not.引导表语从句、同位语从句及位于句首的主语从句只能用whether不能用if的场合：引导介词后的宾语从句（有时可省略）后面紧跟or not时后面直接跟动词不定式时_____ the flight to New York will be delayed is ____ I’m especially worried about. (南京) A. If ; what B. Whether ; that C. When ;that D. Whether ; what【考点】whoever，whichever，whatever，whenever，wherever和however在引导名词性从句时不可与no matter who / which / what/ when/ where / how 替换，因为后者只能引导让步状语从句。
—— Have a nice trip! ——Thanks. I’ll telephone you from _____ I get to by tomorrow evening. ( 广州)A. whereverB. every placeC. wheneverD. no matter where 【考点】名词性从句中引导词that与what的使用场合。
1．that 引导名词性从句时，不在从句中充当任何成分，只起连接作用；而what是连接代词，在从句中充当成分。
语法专项突破专题四各具特色的句法第4讲名词性从句解题指导分析三大从句，分辨五大易混点易混点一定语从句和并列句定语从句与并列句的主要区别：句中若有and,but, so等并列连词或分号则为并列句，此时不需要再填引导词。
1. She has written many novels, some of__________are interesting.2. She has written many novels, and some of_________are interesting.易混点二定语从句和地点状语从句定语从句与地点状语从句的主要区别：定语从句有表示地点的先行词，而地点状语从句则没有；定语从句修饰的是先行词，状语从句修饰的是谓语动词。
1. We young people should go to the place__________is in need of help.2.We young people should go____________we're most needed.易混点三定语从句和时间状语从句定语从句与时间状语从句的主要区别：定语从句有表示时间的先行词，而时间状语从句则没有；定语从句修饰先行词，状语从句修饰谓语动词。
1. I will always remember the days__________I lived with my grandparents in the countryside.2. I always remember the days in the countryside ____________I see the photo of my grandparents.易混点四定语从句和结果状语从句定语从句与结果状语从句的主要区别：the same ...as与such...as引导定语从句，as在从句中充当一定的成分；such/so...that.引导结果状语从句，that在从句中不作成分。
【高考英语】名词性从句内训讲义名词性从句是高考英语的难点和重点，在完形填空、语法填空和改错题中的占的比重较大。
重要的语法专题需要反复学习体会，同时通过历年真题训练，掌握出题规律，总结解题技巧。
软实力英语从辨析的角度，为你分享名词性从句的易错点和高频考点，使你的英语学习更加轻松容易。
一、定义：在复合句中相当于一个名词，做主语、宾语、表语、同位语的从句。
二、引导词：1. 连词:that , if, whether, as if2. 连接代词:who , what, which, whose, whom 以及wh+ever3. 连接副词:when, where, why, because, how三、引导词的作用：1 连词只有连接的功能，而不在从句中充当句子成分。
2. 连接代词和连接副词不但有连接的功能，同时还要在从句中充当定的句子成分，如主语、宾语、表语、定语、状语四、名词性从句的共同特点：1、从句用陈述句语序2、从句缺少主语、宾语或表语时常用what来引导3、句意结构完整时用that来引导五、名词性从句的注意点（一）主语从句结构：1).主语从句 ( 引导词+主语+谓语…) + (主句)谓语+…2) It + is / was + 表语（adj. / n./ V-ed ）+ that等 + 主语 + 谓语…：3) It + seems / happens that + 主语 + 谓语…1.一个主语从句的谓语动词用单数。
2.通常为了句子平衡用it做形式主语, 而将主语从句放于句尾。
3.主语从句句义完整时由that引导，that不作句子成分，但是不能省略。
4.Wh引导的从句, 引导词放于句首，从句用陈述句语序。
5.放于句首时表示是否只用whether, 用It做形式主语之后，主语从句放于句尾时whether与if均可以。
That he likes such kind of books is very interesting. 他喜欢这种书是非常有趣的。
框架结构图名词性从句（主语从句、宾语从句、表语从句、同位语从句）中的连接词名词性从句中的连接词有从属连词that/whether/if等，连接代词what/who/which/whose/ whatever/whoever/whomever/whichever等，连接副词where/when/why/how/wherever/whenever 等。
１．that的用法：（１）主语从句、表语从句、同位语从句中用that但不能省略。
That they are good at English is known to us all.The problem is that we don’t have enough money.The report that there will be a severe storm in the northern area is false.（２）一般情况下，宾语从句中的引导词that可省略，但在以下几种情况中that一般不省略：１当that 从句和主句谓语动词之间有插入语时；２有多个that引导的从句时，第一个that可以省略，而其他的that 常不可省略；３介词except，but，besides，in等后跟that引导的宾语从句时；４当when，who，what，where，why，how等引导的从句与that引导的从句作主句谓语动词的并列宾语时。
He judged that，because he was a child，he did not understand wine.The reason lies in that she works harder than the others do.Everyone knew what happened and that she was worrieＤ．（３）that和what的区别。
that引导名词性从句时，在主从句中不担当任何句子成分，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/which/who”。
It’s a shame that he has made such a mistake.I will do what I can （do）to help him.（４）同位语从句与定语从句中that的区别。
同位语从句中的连接词that只起连接作用，在从句中不担当任何句子成分；而定语从句中的关系代词that 在句中作宾语或主语，与先行词有修饰关系。
如果句子是同位语从句，就应用连接词that而不能用which。
同位语从句一般放在表具体含义的名词后解释说明名词的含义或内容，如以下名词：news，fact，suggestion，truth，plan，belief，doubt，possibility，idea等，而定语从句只是对先行词的限定和修饰。
They expressed the hope that they would come to visit China again.（同位语从句）The hope that they expressed is that they would come to visit China again.（定语从句）２．whether和if的用法：（１）whether和if在宾语从句中可以互换，但是作介词宾语时连接词一般用whether。
It all depends on whether they will come back.（２）后面直接跟or not 时用whether。
I didn’t know whether or not he had arrived in Wuhan.（３）主语从句、表语从句中只能用whether。
Whether the meeting will be put off has not been decided yet.The question is whether they have so much money.（４）whether可以引导同位语从句，用以说明前面的名词的内容，if则不能。
We ought to discuss carefully the question whether we can do it or not.（５）whether常与or连用表示一种选择，if不能这样用；whether也可与动词不定式连用，但if不能。
The question of whether they are male or female is not important.I have not decided whether to go or not.（6）宾语从句位于句首时或者宾语从句提前时用whether不用if。
Thank you，but whether I’ll be free I’m not sure at the moment.（7）whether可引导一个让步状语从句表示“不管”、“无论”，而if不能。
Whether he comes or not，we will begin our party on time.３．“疑问词＋—ever”和“no matter＋疑问词”的区别：（１）“疑问词＋—ever”可引导名词性从句，在主从句中要充当一定的成分。
Whoever breaks the rule must be punisheＤ．You can choose whatever you like in the shop.（２）“疑问词＋—ever”还可引导让步状语从句。
Whoever breaks the rule，he must be punisheＤ．Whatever you do，you must do it well.（３）“no matter＋疑问词”只能引导让步状语从句。
No matter what you do，you must put your heart into it.No matter who comes late，he must be punisheＤ．４．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，否则为同位语从句。
This is the place where the accident happeneＤ．（定语从句）They put forward the question where they could get the money.（同位语从句）主语从句的核心考点１．主语从句在复合句中充当主语，大多数主语从句都可以用it作形式主语而把主语从句置于句尾。
２．that引导主语从句时可用it作形式主语，that不可省；what引导的主语从句表示“……的东西”时，一般不用it作形式主语；whatever，whoever，whichever一般也不用it作形式主语。
That she will succeed is certain.→It is certain that she wil l succeeＤ．What he needs is more experience.常见的it替代that引导的主语从句的句式主要有以下几种：（１）It＋系动词＋形容词（necessary，right，likely，unlikely，wrong，important，certain，clear，obvious，strange，normal等）＋that从句It is certain that most of the farmers have brought in more money by all means.（２）It＋be＋名词（短语）（a pity，a shame，good news，a fact，an honour，a wonder，no wonder 等）＋that从句It’s no wonder that you’ve achieved so much success.（３）It＋be＋过去分词（said，told，heard，reported，decided，suggested，advised，ordered，remembered，thought，considered，well—known，announced等）＋that从句It is said that the professor has already succeeded in carrying out the experiment.（４）It＋特殊动词（seem，appear，happen，matter）＋that从句It happened to me that I had been away when he calleＤ．注意：（１）在“It is necessary/important/strange/natural...＋that从句”结构中，从句谓语常用“（should＋）动词原形”。
（２）在“It＋be＋suggested/advised/ordered/requested/insisted/requireＤ．..＋that从句”结构中，从句谓语应用“（should＋）动词原形”。
宾语从句的核心考点１．动词的宾语从句（１）大多数动词（hope，tell，say等）可以带宾语从句。
We all expect that they will win，for members of their team are stronger.I don’t think you are right.I don’t suppose he cares，does he？（２）动词find，feel，think，consider，make，believe等后有宾语补足语时，则常用it作形式宾语而将that宾语从句后置。
I think it necessary that we take plenty of boiled water every day.（３）有些动词（短语）带宾语从句时习惯上需要在宾语从句前加it。
这类动词（短语）有hate，enjoy，like，love，dislike，see to等。
I hate it when they talk with their mouths full.２．一般情况下介词后只能用wh—类连接词引导宾语从句。
We are talking about whether we admit students into our cluＢ．注意：（１）where引导的从句有时也可用作介词的宾语。
