高二英语名词性从句

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高中英语名词性从句知识讲解以及练习题附答案

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。

人教版高中英语高二语法名词性从句

I have heard the news that he visited our factory . I have heard the news that he told you the other day . 同位语从句和定语从句的区别：同位语从句和定语从句的区别： 1 同位语从句同位语从句——that 只起连接作用，不作任何成分只起连接作用，是关系代词，定语从句 —— that 是关系代词，起连接作用和充当宾语和主语 2同位语从句同位语从句——同位语从句和前面的名词是同位关系，同位语从句和前面的名词是同位关系，同位语从句同位语从句和前面的名词是同位关系对名词进行补充说明定从和前面的名词是所属关系，定语从句 ——定从和前面的名词是所属关系，对定从和前面的名词是所属关系名词进行修饰，名词进行修饰，加以限定 3同位语从句同位语从句——that 不能省同位语从句在从句中作宾语时，定语从句 ——that 在从句中作宾语时，可以省
11 We made the suggestion that he ___ his work . B A continues B continue C continued D had continued
1 ____made the school proud was ____more than B 90%of the students had been admitted to key universities . A What / because C That / what B What / that D That / because
4同位语从句：从句在句中充当同位语成分，其一般跟同位语从句：从句在句中充当同位语成分，同位语从句在一些抽象名词（在一些抽象名词（ idea / belief / fact / truth / problem / news 等）后面，对名词作进一步解释说明后面，引导或用连接副词when / 同位语从句常用 that 引导或用连接副词 where/why / how / whether The idea that computers can recognize human voices surprises many people . I have no idea when she will be back . Word came that Napoleon himself was coming to inspect them .

高二英语名词性从句知识精讲

高二英语名词性从句知识精讲高二英语名词性从句知识精讲人教版一. 本周教学内容：第五单元语法：名词性从句1. 名词性从句2. 同位语从句3. 同位语从句与定语从句的辨析4. what; whatever; whoever; where引导的名词性从句5. it 作为形式主语的句型二. 知识总结与归纳：（一）名词性从句的结构：名词性从句起名词作用在句中做主语，表语，宾语和同位语构成：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三类：that；whether; wh-疑问词。

例句：1.The result of this French influence was that the English language ended up with many French words such as table, animal and age.2. They realize that it is of great value to record and teach them to the younger generation.3. I want to tell the reader that these hills and fields are most beautiful, with many small and clear rivers, and rich fields bearing fruit and grain.4. Some people feel that Wales is an ancient fairy land.5. What interested him was that the whole world had been mapped 70 years before Columbus.6. What is certain that the book has made many people think about the achievements of Zheng He and other Chinese captains and their role in discovering the world.7. That most of these are now threatened and may disappear is a serious matter to the people in Britain.8. This gave him the idea that the Chinese perhaps first discovered America.（二）同位语从句在名词idea; fact; news; thought; suggestion/advice; problem; proof等词后面带上that+陈述句这部分从句解释了前面的那些名词所指的内容，与那些名词起着同等作用的句子成分，叫同位语从句。

高二英语名词性从句

C.go
D.were allowed to
同位语从句和定语从句的区别:
如果that作从句中的某一成分,则是定语从句,如果that不作从句中的任何成分,则是同位语从句.
(1). I had no idea that it was too late.
(2).I still remember the place that we visited last year.
在同位语从句中当名词为advice、 order、suggestion、proposal时，后面的同位语从句应使用虚拟语气，谓语v.用（should）＋V.。
1.The suggestion thBat he _____ at the
meeting was agreed to by most people.
(3)由疑问词who，what， where，when, how等引导。
eg:1.The question who should do the work requires consideration .
2.We haven’t settled the question where we are going to spend our summer vacation.
egs：I’ve no idea that Kate has been to shanghai.
同位语从句
The book (that) I bought yesterday was written by LuXun.
定语从句
He can’t answer the question how he got the money.
主语从句（the subject clause)

高中英语语法名词性从句

规律一：名词性从句在句中要用陈述语序
II．引导词的选择
1. ____ we can't get seems better than ____ we
have. A.What , what C. That , that
B. What , that D. That , what
2. It worried her a bit ____ her hair was turning grey. A．while C．if B．that D．for
规律四：主语从句和宾语从句在适当的情况下可以借助 “it” 而后置。
1.主语从句可以用it （作形式主语）来替换成以下几种结构表达。 (A)It is clear/certain/likely /true/surprising that… （B）It is a pity/shame /good idea/no wonder that ...
The question of whether they are male or female is not important. I have not decided whether to go or not.
⑥ whether可引导一个让步状语从句表示 “不管”、“无论”，而if不能，但可以引导一个条件状语从句表示“如果”如：
• (4)同位语从句 • 就是在句中作同位语的从句。它通常有放在thought, idea, news, word(=news), plan, doubt, question, fact, suggestion, belief等抽象名词的后面，说明这些词的具体内容或含义。同位语从句大多由that引导，也可由whether, how, when, where, why等引导，但不能由which 引导。如： • The idea that the earth is round is not a new one. “地球是圆的”这种观点并不新鲜。He must answer the question whether he agrees to it or not. 他必须回答他是否同意此事这们一问题。 • I have no idea when he will set out. 我不知他什么时候出发。 • 注：有时，同位语从句并不紧跟在它所说明的词的后面。如： • The whole truth came out at last that he was a wolf in sheep’s clothing. 真相终于大白了，他原来是一只披羊皮的狼。

高二英语名词性从句通用版知识精讲

高二英语名词性从句通用版【本讲主要内容】名词性从句：1. 主语从句，表语从句，宾语从句和同位语从句的结构2. 名词性从句的连词及用法3. It在名词性从句中的用法【知识总结归纳】（一）名词性从句起名词性作用在整个句子当中充当以下作用：1. 做主语，成为主语从句：例：That most of these are now threatened and may disappear is serious matter to the people in Britain.2. 做宾语构成宾语从句：例：They realise that it is of great value to record and teach them to the younger generation.3. 做表语构成表语丛句：例：The result of so much French influence was that the English language ended up with many French words such as table, animal and age.4. 在idea , plan , thought , fact , news, hope, possibility agreement等名词后面解释这些名词的内容，做这些名词的同位语构成同位语丛句。

例：The idea that England stands for Fish&Chips, Speakers’ Corner, Big Ben and the Tower of London is past.（二）名词性从句的连词：名词性从句必须有一个连词引导。

根据名词性从句表达的内容使用不同的连词。

1. 从句表达陈述的内容用连词that引导：例：（1）That it is a competition between two of the oldest and most famous universities in the world may be new to you.（2）The result that Oxford beat Cambridge by afoot in 2003 surprised many.（3）Do you know that there is a boat race between Oxford and Cambridge every year ?（4）One of the biggest chanllenge is that what Menzies believes to be America on the map is, perhapes, Antartica.（5）The reason seems to be that different periods are related to different kinds of achievement.注意：在宾语从句中that可以省略。

高二英语名词性从句

• whether/if
• 一般疑问句转化而来---有词义，但在从句中不担任成分
• wh-词
• 特殊疑问句转化而来---有词义，在从句中担任成分
• I told him that I would come back soon. • Whether we will succeed is still a question. • Who he is has nothing to do with you.
同位语从句引导词that只起连接的作用不充当句子成分
定语从句引导词that除了引导句子外还充当一定的句子成分
同位语从句与前面的名定语从句对先行词起修词是同位关系表示这个饰作用，表示“…的”。名词的内容同位语从句的that 一般不能省而定语从句中的关系代词that，当其在从句中做宾语时，常常可以省略
I don’t know whether or not she’ll like it.
三. 表语从句
表语从句的引导词与主语从句和宾语从句相同. 但: 1. that引导表语从句时不能省.
2. if不能引导表语从句.
四. 同位语从句同位语从句一般跟在名词 fact, news, idea, suggestion 等后面 , 用以说明或解释前面的名词.
3.Dr. Black comes from either Oxford or
Cambridge, I can't remember ____.
A．where
C．which
B．there
D．that
4.Energy is ____ makes things work．
A．What

高中英语语法---名词性从句详解

名词性从句详解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。

一.语法讲解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。

（完整版）高考英语【名词性从句】

（完整版）高考英语【名词性从句】专题十名词性从句第一节基本知识与基本概念【什么是名词性从句？】顾名思义，主语从句在句子中作主语。

有时本身出现在主语的位置上，也有时出于句子结构的考虑退到句子的尾部，前面用形式主语it代替。

从句作主语时，谓语动词一般为单数形式。

如: What I saw was beyond any verbal description.That his hair was turning grey worried him a bit.Why the company denied the contract is still unknown.When and where the government will build a city square is under discussion.It is pretty annoying that a small part of the machine is missing.It remains to be seen whether the new novel will be well received.【宾语从句】在句子中作宾语的从句就是宾语从句。

由于这是同学们接触比较早的一种从句，应该问题不大。

所以在近年的高考题中，以宾语从句的知识作为考点的题目较少。

但是，宾语从句也有自己的特殊情况，如介词的宾语，形容词的宾语，宾语从句提前和并列的宾语从句等现象。

如：We assumed that there would be more than 100 guests.He told the police in detail what he saw and heard.Nobody is sure what humans will look like in a million years.That will depend on whether they can get the chance.Whether I will have the time I am not sure at the moment.The conductor complained that we were not gifted in singing and that he would never come again.【表语从句】表语从句的最重要脸谱就是它们应该出现在系动词的后面。

高中英语语法——名词性从句

1.___W__h__e_n___ the meeting will begin isn't decided now. 2. His question was ___w__h_e_r_e_we would hold the opening ceremony. 3. I just want to ask you ___w__h_y___ I was fired. 4. What the professor asked us was __h_o__w___ we could make our parents happy.
①that 引导同位语从句时，是连词，不作成分，只起连接作用，that不能省。 that 引导定语从句时, 是关系代词,作主语或宾语。作宾语时常可以省略。 ②定语从句的先行词可以是任何名词或代词；同位语从句前面的名词必须是抽象名词，常考的有消息(news/ word/ information/ message)、事实(fact/ truth)、观点(opinion/ view/ thought/ idea/ belief)、希望(hope/ wish)、问题(question/ problem/ doubt)、请求(request/ requirement/ demand/ desire)、建议(advice/ suggestion/ recommendation/ proposal)、承诺(promise)等。
who/ whoever的区分 whoever强调的是人，who表示疑问谁
_W__h_o_e_v_e_r__ could solve the problem will be rewarded. __W__h_o_____ will solve the proble is unknown. __W__h_o_e_v_e_r_ breaks the law, he will be punished.

高二英语学考名词性从句课件

1.Don’t always believe him. Sometimes ______ he does is quite different from what he says. (09年学考真题) A. what B. that C. how D. who 2.__ we‘ll go for a summer camp at the seaside hasn’t been decided yet. （2010年） A Who B Why C Whether D What
5.____ you said just now has really hurt my feelings.（2013年） A. That B. Why C. When D. What
• 学考要点：宾语从句放在行为动词后或者介词后
• 1. I don’t know ___ the girl is talking about. A. that B. what C. why D. whether • 2. Can you tell me ___ is going to give us a talk next Monday . A, who B. whom C. whose D. what • 3. I want to know ______ she will come tomorrow? A. what B. where C, whether D. that
学习目标
1.掌握名词性从句的概念，分类及引导词 2. 掌握名词性从句解题技巧 3.把握学考关于名词性从句的动态
1.名词性从句定义
从句在句中起名词的作用，称之为名词性从句
名词性从句分类
主语从句宾语从句表语从句同位语从句
名词性从句引导词

高二英语Unit5名词性从句知识精讲

高二英语Unit5名词性从句知识精讲高二英语Unit5名词性从句知识精讲定义：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,主语: His job is importantWhat he does is important.表语: This is his job.This is what he does every day.My idea is that we should help her do housework everyday.名词性从句在复合句中能担任: 主语、宾语(介词宾语)、表语、同位语，因此,根据它在句中不同的语法功能，可分为:主语从句、宾语从句、表语从句和同位语从句。

注意：1.从句一律保持陈述语序。

2. 名词性从句可以表示：事实和问一、引导名词性从句的连接词可分为三类：连接连词：that, whether, if , as if ,because（不充当从句的任何成分，且that 也没有任何意义）连接代词：what, whatever, who, whoever, whom, whose, which.连接副词：when, where, how, why二、名词性从句的注意事况1、what与that 的区别：that 和 what 都可引导所有的名词从句。

但是，what除起连接作用外，还在名词性从句中充当成分，表示说的、做的、想的等内容，可做从句的主语、宾语、或表语。

而that在名词性从句中不充当任何成分，只起连接作用。

Eg.That he stole a bike was true. 他偷了一部自行车是真的The important thing is what you do , but not what you say .重要的是你做什么，而不是说什么。

Practice:1.what he wants is a book.2. That he wants to go there is obvious.3.The result is that we won the game.4.This is what we want to know.8. I have no idea what he did that afternoon.2．that不可省略的情况：a. 主语从句、表语从句和同位语从句b.用it做形式宾语的宾语从句c.并列的宾语从句中的后几个从句的引导词that 不能省略3、whether 和 if 的区别是: （在下列情况下，whether 不能被if 取代）a. 主语从句b. 表语从句Unit4c. 同位语从句e. 介词后的宾语从句只能用“whethr”, （一般可以互换）f. whether to do 做动词宾语不能用if to do.（whether也可与动词不定式连用但if不能）g .whether or not 连在一起引导宾语从句时不用if.名词性从句作：一、主语从句：从句在句中充当主语成分，1. 通常放在主句谓语动词之前 *Eg.1). That he will succeed is certain .2) Whether he will go there is not known .3) What he said is not true .4) Where he hid the money is to be found out .5) Whoever comes is welcome.2. 也可以由形式主语it 来代替，而将主语从句放在句末。

完整版)高中英语名词性从句详解

完整版)高中英语名词性从句详解名词性从句可以作为主句的主语、表语、宾语和同位语。

它们分为主语从句、表语从句、宾语从句和同位从句。

宾语从句作为复合句中的主句及物动词的宾语，也可以作为介词或某些形容词的宾语。

它不担任成分，只起连接作用。

连接词可以是从属连词、关系代词、关系副词。

从属连词包括that、whether、if；关系代词包括who、whom、whose、what、which；关系副词包括when、where、why、how。

这些词既担任成分，又起连接作用。

宾语从句的例子有：I think (that) you will like the pictures。

He has e what he wanted to be ten years ago。

I don’t know why Jane was late for school this morning。

The teacher is pleased with what she said。

I'm afraid that I can't go to the party.在宾语从句中，由that引导的从句可以省略，但如果从句是并列句时，第二个分句前的that不可省略。

另外，宾语从句中的时态要与主句呼应，如果主句动词是过去时态，从句则要用相应的过去时态。

如果从句表示的是客观真理、科学原理或自然现象，从句仍用现在时态。

如果主语谓语动词为think、consider、suppose、believe、expect、guess、imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式。

XXX。

It is often said that traveling broadens the mind。

I XXX I was determined to carry out the plan。

I consider it XXX。

高二英语名词性从句讲解

（表语从句）
3、He want to know who she is / who she has seen .
（宾语从句）
“who”----“ __谁__”作、主__表__宾_成语份、起__连__接__作用
“who”---“谁”、作主宾表语、起连接作用
1、Who will go to the college is still uncertain .
“how”----- “如何”、作状语、起连接作用
总结：引导名词性从句的三类关联词
1. that , whether/ if (在从句中不做成分，只起连接作用)
2. what who which whose (在从句中做主、表、宾、定成分)
3. when why where how(在从句中做状语)
1、English is very useful for us . 2、The subject I am interested in is English. 3、We need to master English well. 4、He want to learn the language , English .
用that / what填空：
1.__W__h_a_t he wants is a book. 2. __T__h_a_t he wants to go there is obvious. 3.The result is ____th_a_twe won the game. 4.This is ___w_h_awt e want to know. 5. I have no doubt ___t_h_aht e will come. 6. I have no idea ___w__hahte did that afternoon.

高二英语语法名师讲解：名词性从句

高二英语语法名师讲解：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，名词性从句可分为主语从句、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(好像)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。

e.g. Who will go is not important.2. 用it作形式主语，主语从句放在句末。

e.g. 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。

e.g. 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。

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.四、宾语从句1. 宾语从句在复合句中作宾语。

高二语法名词性从句

高二语法-名词性从句专讲名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句，其功同名词一样。

一．主语从句主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。

1. It 作形式主语和it引导强调句的比较It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。

而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。

被强调部分指人是也可用who/whom。

例如：It is a pity that you didn’t go to see the film.It doesn’t interest me whether you succeed or not.It is in the morning that the murder took place.It is John that broke the window.2. 用it 作形式主语的结构(1) It is ＋名词＋从句It is a fact that …事实是…It is an honor that…非常荣幸It is common knowledge that…是常识(2) it is ＋形容词＋从句It is natural that…很自然…It is strange that…奇怪的是…(3) it is ＋不及物动词＋从句It seems that…似乎…It happen ed that…碰巧…(4) it ＋过去分词＋从句It is reported that…据报道…It has been proved that…已证实…3. 主语从句不可位于句首的五种情况(1) if 引导的主语从句不可居于复合句句首。

(2) It is said , (reported) …结构中的主语从句不可提前。

例如：It is said that President Jingo will visit our school next week. (right)That President Jiang will visit our school next week is said. (wrong)(3) It happens…, It occurs… 结构中的主语从句不可提前。

高二名词性从句的用法总结

高二名词性从句的用法总结一、引言名词性从句是指在句中充当名词的从句。

在高二英语学习中，名词性从句的运用是一个较为重要的语法知识点。

掌握名词性从句的用法可以帮助我们在写作和阅读中更加准确地表达自己的意思，提升语言表达能力。

本文将总结高二名词性从句的用法，以帮助同学们更好地掌握这一知识点。

二、主语从句主语从句通常出现在句子的主语位置，引导词有：that, whether, who, whom, which等。

例句：1. Whether we should go on a picnic tomorrow is still under discussion.2. Who will take care of the baby is the main concern for the parents.三、宾语从句宾语从句通常出现在句子的宾语位置，引导词有：that, whether, if, what, who, whom, which, when, where, why等。

例句：1. I don't know what she wants for her birthday.2. The teacher asked whether we had finished our homework.四、表语从句表语从句通常用来对主语进行补充说明，引导词有：that, whether, who, whom, which等。

例句：1. His biggest hope is that he can study abroad.2. What makes her happy is that she passed the exam.五、同位语从句同位语从句通常用来对前面的名词进行解释或者说明，引导词有：that, whether, what等。

例句：1. The fact that he failed the exam disappointed his parents.2. I heard the news that they are getting married.六、宾语补足语从句宾语补足语从句通常出现在某些及物动词（如：think, believe, find, feel等）、感官动词（如：see, hear等）、使役动词（如：make, let, have等）后面，引导词有：that, whether, if, what, who, whom, which等。

高二英语课件必修名词性从句课件

主语+谓语+名词性从句+原因状语：主语和谓语表示时间，名词性从句表示动作或状态，原因状语表示动作或状态的原因
语态的用法
主动语态：主语发出动作，主语是动作的执行者
被动语态：主语接受动作，主语是动作的承受者
不定式语态：表示动作尚未发生或正在进行中
完成时态：表示动作已经完成，对现在产生影响
进行时态：表示动作正在进行，与现在时间有关
在从句中作主语或宾语
在从句中作定语，修饰名词
名词性从句的时态和语态
04
时态的用法
主语+谓语+名词性从句：主语和谓语表示时间，名词性从句表示动作或状态
主语+谓语+名词性从句+时间状语：主语和谓语表示时间，名词性从句表示动作或状态，时间状语表示动作或状态的时间
主语+谓语+名词性从句+地点状语：主语和谓语表示时间，名词性从句表示动作或状态，地点状语表示动作或状态的地点
表语从句：在句子中作为表语的从句
同位语从句：在句子中作为同位语的从句
定语从句：在句子中作为定语的从句
状语从句：在句子中作为状语的从句
名词性从句的作用
强调某个部分，使句子重点更突出
连接主句和从句，使句子结构更完整
提供更多的信息，使句子内容更丰富
使句子表达更简洁，避免重复表述
名词性从句的引导词
03
that的用法
引导名词性从句，充当主语、宾语、表语等成分
引导倒装句，表示强调或疑问
引导限制性定语从句，修饰先行词
引导非限制性定语从句，补充说明先行词
what的用法
引导名词性从句，表示“什么”
在某些情况下，what可以省略，但句子意思不变

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