2020年高考必考点专题14名词性从句精讲深剖英语 解析版
完整word版2020版高考英语名词性从句考点解读
2020高考英语名词性从句考点解读that suddenly 大猩猩)is more frightened, me or the female gorilla(] I‘m not sure 1. [2018·全国卷Ⅲappears out of nowhere.gave her the confidence to keep challenging the I asked her ·浙江卷自选模块]Recently,2. [2016). status quo(现状My uncle is the owner of a restaurant close to that I live. 短文改错] 3. [2016·全国卷ⅢThe summer holiday is coming.My classmates and I are talking about how to do 短文改错] 4. [2016·全国卷Ⅲduring the holiday. you can do helps. ]Your support is important to our work.5.[2016·北京卷变式引导的名词性从句考点一that that引导的主语从句、宾语从句和表语从句规则??但引导主语从句、表语从句、在从句中不担任任何句子成分,连词that在引导名词性从句时本身没有意义,同位语从句时不能省略。
在宾语从句中有时可省略。
re two with the same name who it became evident that there‘①As I searched the name Linda on the Internet, look completely different.)很显然有两个看着完全不同但姓名相同的人。
这个名字的时候,(主语从句当我在网上搜索Linda ②I find it necessary that we should spend more time practising spoken English. )我发现我们有必要花更多时间练习英语口语。
2020年高考英语必考点全梳理专题1-名词(精讲深剖)(含解析)
专题01 名词I.单句语法填空1.（2019・全国卷I）In recent years some Inuit people in Nunayut have reported increases in bear sightings around human settlements, leading to a ______ (believe) that populations are increasing.【答案】belief【解析】考查名词。
根据其前不定冠词和其后的同位语从句可知，空格处为名词形式，故填belief。
2.（2019・全国卷III)When they were free from work，they invited us to local events and let us know of an interesting (compete)to watch，together with the story behind it.【答案】competition【解析】考查名词。
由空格前的不定冠词an与空格后的不定式to watch可以确定空格处应该填名词形式。
故填competition。
3.（2019・浙江卷)Other American studies showed no ______(connect) between uniforms and school performance.【答案】connection/connections【解析】考查名词。
句意：其他的美国研究表明校服和学校表现之间没有联系。
no是形容词，形容词修饰名词，位于名词前，名词可用复数也可用单数形式。
connect是动词，“联系”的意思，因此，要用其名词形式。
故填connection/connections。
4.（2018·6月浙江高考）Making Chinese ( dish)is seen as especially troublesome.【答案】dishes【解析】考查名词单复数。
2020年高考英语名词性从句语法讲解
2020年高考英语名词性从句语法讲解(名师精讲必考语法，建议下载练习)一．名词性从句基本概念：在句子中起名词性作用的从句叫名词性从句。
Peter is interesting. What Peter said is interesting.主语主语从句I know Peter. I know that Peter is lovely.宾语宾语从句This is Peter. This is where Peter lives.表语表语从句A lovely teacher,Peter,is here.同位语The news that we won the game is exciting.同位语从句EG: I don’t know whether we will go out.二．名词性从句连接词的选择You may borrow which book you like.Whose watch was lost is known.三．主语从句1.定义：名词性从句做主语。
2.连接词That the earth moves around the sun is known to all.Whether we will go picnicing tomorrow depends on the weather. Who stands there is my father.2.用it作形式主语。
It be + 形容词/名词/过去分词+that从句It is a pity that he didn’t win the game.It is well known that the earth runs around the sun.EX：1.____we are invited to the concert this evening is good news to us.2.____we need is more time.3.__will come to have dinner is not known.4.It is common knowledge ____the whale is not a fish.5.It is known ____ he has agreed to my plan.四.宾语从句1.定义：名词性从句作宾语。
（完整版）高中英语名词性从句讲解（可编辑修改word版）
（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。
高考英语最新名词性从句知识点图文解析
高考英语最新名词性从句知识点图文解析一、选择题1．Their ship was blown off course by strong wind, and they arrived in ________is known as Greenland by chance.A．where B．when C．what D．which2．_______football is such a simple game to play is perhaps the basis of its popularity. A．What B．Whether C．That D．Which3．______ they have won the game made us excited.A．/B．That C．What D．Which4．It is by no means clear the local government will do with the buildings of poor quality. A．what B．how C．whether D．which 5．Andrew is such a rebellious person that he often offends against _______ others consider accepted rules.A．that B．what C．which D．whether6．I know nothing about the young lady _______ she is from Beijing.A．except B．that C．except that D．except for7．I want to know _______.A．what matter it is B．what’s the matterC．what the matter is D．the matter is what8．Much to the couple's comfort，their income is now double ________ it was five years ago. A．that B．if C．which D．what9．Filled with anger, a person tends to say ______ comes to his mind.A．whatever B．whichever C．whenever D．whoever10．All of us were so excited at the news ____we’ll go abroad for holidays ___we jumped with joy.A．that; that B．what; and then C．what; that D．which; so11．If you are addicted to your mobile phone, that’s ______ you should lay it down and be involved in meaningful activities.A．when B．why C．where D．how12．We must be in a place of peace and faith, so internal conflict and disbelief do not hold back ________ it is possible for us to achieve.A．how B．what C．why D．where 13．Education is ______________ survives when knowledge taught in class has been forgotten. A．how B．who C．what D．which14．He explained ______ for his father's birthday party.A．why was he late B．why is he lateC．why he is late D．why he was late15．As long as you know what you really want, you can choose kind of life you like. A．however B．whatever C．whenever D．which 16．Many experts stick to the view ______ teacher development is the key to the education quality.A．which B．what C．that D．where 17．—What’s your understanding of success,Robert?—In my view,success is________preparation and chances meet.A．how B．why C．what D．where18．It was__ he said__ disappointed me.A．that；what B．what；that C．what；what D．that；that 19．The whole nation responds to the call _______ everybody shall wear masks wherever they go. A．which B．that C．when D．because20．The companies are working together to create ________ they hope will be the best means of transport in the 21st century.A．which B．that C．what D．who21．I am interested in_________ you have improved your spoken English in such a short time. A．how B．which C．when D．if22．Police have found ________ appears to be the lost ancient statue.A．which B．where C．how D．what23．I think my father would like to know_______I’ve been u p to so far, so I decide to send him a quick note.A．which B．what C．why D．when24．In my view, ______ impresses me about her writing is the passion she shows.A．who B．which C．what D．whether25．By reading the story, you may understand ______ to be successful.A．it takes what B．you take what C．what takes you D．what it takes【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【分析】【详解】考查宾语从句。
2020年高考英语必考点全梳理专题14-名词性从句(高效演练)(含解析)
专题14 名词性从句——高效演练一．单句语法填空1．________ she was invited to the ball made her very happy．【答案】That【解析】空格处引导主语从句。
从句中不缺少成分，并且句意完整，因此用that引导该主语从句。
2．Children should be reminded of ________ they should do in public places．【答案】what【解析】句意：应该提醒孩子们在公共场所应该做些什么。
所填词引导宾语从句且在从句中作do的宾语，意为“……的事情”，且what引导介词of后的宾语从句。
故用what。
3．Dick enjoys painting but he knows the fact ________ he doesn't have what it takes to be a professional．【答案】that【解析】句意：迪克喜欢画画，但他知道自己没有成为一名专业画家所需要的(素质)。
that引导同位语从句，说明fact的具体内容。
4．Success partially depends on ________ you have the patience to do simple things perfectly．【答案】whether【解析】根据句子结构可知，设空处引导宾语从句；根据句意可判断，设空处意为“是否”，其前有介词on，故填whether。
5．I lost my cell phone yesterday．Can you tell me ________ I can buy one?【答案】where【解析】where引导宾语从句，且在从句中作地点状语。
6．It never occurred to me ________ you could succeed in persuading him to change his mind．【答案】that【解析】it为形式主语，真正的主语为后面的从句，从句中不缺少成分，且句意完整，因此用that。
高考英语名词性从句讲解(最全版)44948PPT课件
4、I knew the news that our team won the match.
宾语从句
5、His suggestion is that we should finish the
work at once.
表语从句
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7
“whether”---“是否”、不作成份、起连接作用
英语名词1
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。
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useful for us now（. 同位语从句）
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If与whether的区别：
If 只能引导两种名词性从句：宾语从句、不放于句首 的主语从句。Whether四种从句均可以引导。
请思考：
1、Whether she will come back on time depends on
weather . 2、I asked him whether he could do me a favor .
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请用if / whether填空：
1、I asked her _i_f_/_w__h_e_t_h_er she had a bike. 2._W__h__e_ther we will hold a party in the open air
tomorrow depends on the weather.
record .（同位语从句）
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高考英语专题名词性从句知识点全集汇编附解析
高考英语专题名词性从句知识点全集汇编附解析一、选择题1．—How do you find the 5G cell phones?—Oh,quite good.A new function has been developed on this new model_____it has faster data transmission and lower delayA．that B．which C．what D．whether2．It is _______ he said _______ is very important to me.A．what; that B．that; that C．all that; what D．which; that 3．Thor is no longer _______ he was two years ago.A．that B．who C．what D．which4．His mother did _______ she could ______ the boy.A．what help B．that help C．what to help D．that to help5．It is widely believed that _______ has necessary good qualities is more____ to achieve success in their career.A．whoever; possible B．who; likely C．who; possible D．whoever; likely 6．Filled with anger, a person tends to say ______ comes to his mind.A．whatever B．whichever C．whenever D．whoever7．The other day, my brother drove his car down the street at _____ was a dangerous speed. A．as B．what C．which D．that8．Anyone with common sense is able to make the proper decision and do ______ suits the occasion best.A．no matter what B．no matter how C．whatever D．however9．— Would you please tell us the prospect of fighting against COVID-19?—We are sure to win the battle, but ______ it’ll be over soon I’m not sure at the moment. A．whether B．that C．if D．when 10．—Friends are very important for teenagers.—Yes. A friend will be listened to___________a parent or a teacher might not.A．where B．what C．why D．which 11．Education is ______________ survives when knowledge taught in class has been forgotten. A．how B．who C．what D．which 12．Andrew is such a rebellious person that he often offends against _______ others consider accepted rules.A．that B．what C．which D．whether 13．Considerable evidence has been found over the years ________lack of exercise is connected with increased risk of cancer.A．whether B．thatC．why D．how14．The weather is fine. I’m sure ________ we can go camping this afternoon.A．why B．what C．that D．if15．Many experts stick to the view ______ teacher development is the key to the education quality.A．which B．what C．that D．where16．It was__ he said__ disappointed me.A．that；what B．what；that C．what；what D．that；that 17．There is a common belief among the students in our school _____ they should make great efforts to learn and reach the peak of their academic performances.A．which B．that C．whether D．if18．Everyone faces challenges in life. It’s a matter of __________ you learn to overcome them and use them to your advantage.A．that B．what C．which D．how19．Police have found ________ appears to be the lost ancient statue.A．which B．where C．how D．what20．In my view, ______ impresses me about her writing is the passion she shows.A．who B．which C．what D．whether21．He explained ______ for his father's birthday party.A．why was he late B．why is he lateC．why he is late D．why he was late22．Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.A．whether B．whyC．when D．how23．—Could you show me_____?—Sure.A．where is the library B．where the library is C．how can I go to the library 24．Word came _______ Chinese climbers made it to the top of Mount Qomolangma once again on May, 27th. I was always wondering _______ they managed to make such a great achievement . A．which; why B．that; why C．that; how D．when; how 25．Their ship was blown off course by strong wind, and they arrived in ________is known as Greenland by chance.A．where B．when C．what D．which【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【分析】【详解】考查同位语从句。
2020高考英语语法复习专题名词性从句精讲课件(共52张PPT)
We also had different students in some classes, so it was a struggle for me to remember all the faces and names.
技巧 : 位置判断
KINGSOFT
What kinds of clauses are they?
Your mother thinks that playing computer games too much is harmful to your eyesight.
Subject 主语
Predicate 谓语
复合句 形式：主句+从句
What he said is not true.
简单句
简单句就是单句，是英语的句子单元。 基本结构：通常由一个主语和一个谓语构成。 e.g. You are students. The students are taking some classes.
并列句
由两个或两个以上的简单句用并列连词连接在 一起构成的句子。
相关概念 名词在从句中可以做什么成分？
名词在从句中主要做 主语 宾语 表语 同位语
名词性从句 : 主语从句, 表语从句, 宾语从句, 同位语从句
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。
Review of Noun Clauses
名词性从句专题
英语句子
(完整word版)高中英语名词性从句讲解
合用文档名词性从句讲解在复合句中起名作用的从句叫做名性从句。
它包括主从句、从句、表从句和同位从句。
名性从句是中学段的一个重要法目，在年的高考中几乎都涉及到，并且每年的命各有化。
分析届高考名性从句考的焦点主要有以下六个方面1.考名性从句的序2.考引 that与 what 的区3.考 it 在名性从句中作形式主或形式的用法4.考 whether 与 if 的区5.考名性从句中的疑+ever 引的名性从句与no matter+ 疑引的状从句的区6.考名性从句的虚气法要点分析一、名性从句主从句、表从句、从句、同位从句，在整个句子中所起的作用，相当于一个名。
因此，四种从句通称名性从句。
引名性从句的接可分三：接： that, whether, if〔不充当从句的任何成分〕接代： what, whatever, who, whoever, whom, whose, which.接副： when, where, how, why1.主从句作句子主的从句叫主从句。
主从句平时由隶属that ，whether ，if和接代what ，who，which ，whatever ， whoever 以及接副 how， when， where， why 等引。
that 在句中无，只起接作用；接代和接副在句中既保存自己的疑含、又起接作用，在从句中充当从句的成分。
比方：What he wants to tell us is not clear.他要跟我什么，不清楚。
It is known to us how he became a writer.我都知道他是怎样成一名作家的。
Where the English evening will be held has not yet been announced.英晚会将在哪里行，没有宣布。
有防范句子重脚，常用形式主it代替主从句作形式主放于句首，而把主从句置于句末。
主从句后的一般用数形式。
2020_2021学年高考英语语法核心考点复习名词性从句知识点(含参考答案)
高考英语语法核心考点复习：名词性从句知识点概述：名词性从句的功能相当于名词。
根据其在句中充当的成分，可分为：主语从句、宾语从句、表语从句和同位语从句。
主语从句在复合句中做主语的从句叫主语从句。
引导主语从句的连词：that（无意义，所引导的主语从句是完整的），whether （是否），if （是否）（通常只能用于it作形式主语的主语从句），连结代词：who （谁）（主格）, whom （谁）（宾格）, whose（谁的）（所有格）, what （什么，所……的（东西或事情））, which （那个，那些），whoever （无论谁）（主格）, whomever （无论谁）（宾格）, whatever （无论什么）, whichever （无论那个，无论那些），连接副词：when（何时）, where （何地）, how （怎样，如何）, why （为什么）等。
如：That the 2022 Winter Olympic Games will be held in Chengde is known to us all.=It is known to us all that the 2022 Winter Olympic Games will be held in Chengde.=What is known to us all is that the 2022 Winter Olympic Games will be held in Chengde.=As is known to us all, the 2022 Winter Olympic Games will be held in Chengde.众所周知，２０22年冬季奥运会将在承德举行。
That you don’t like him is none of my business.你不喜欢他与我有什么关系呢。
What he said at the meeting astonished everybody present.他在会上的发言是到会的人都感到惊讶。
高考名词性从句详细讲解归纳与真题练习(打印版)
v1.0 可编辑可修改1高考英语名词性从句讲解【考情剖析】名词性从句是历年高考的重点和难点也是热点。
名词性从句相当于名词，可用作主句的主语、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。
引导名词性从句的衔接词有：衔接代词：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；衔接副词：when, where, why, how ，有词义，在从句中担任成分，作状语；衔接词：that, whether, if, as if ，if (whether), as if 虽有词义，但在从句中不担任成分；that 无词义，在从句中不担任成分，有时可省略。
今后对名词性从句的考查仍将集中在关联词的选用上，特别石堆what 引导的名词性从句的考查。
名词性从句与其他从句的混合考查将在今后高考中占据一席之地。
易混句型的辨析，比如it 作方式主语，主语从句后置的句型与强调句型的辨析将仍作为高考考查的重点。
【知识点归纳】名词性从句的用法在句子中起名词作用的句子叫名词从句 (Noun Clauses ）。
名词从句的功用相当于名词词组, 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一样的语法功用，名词从句又可区分称为主语从句、宾语从句、表语从句和同位语从句。
一、引导名词性从句的衔接词引导名词性从句的衔接词可分为三类：连词：that （无任何词意）；whether, if （均表示“能不能”标明从句内容的不确定性）；as if ,as though （均表示“似乎”，“似乎”）。
以上在从句中均不充任任何成分衔接代词：what, whatever, who, whoever, whom, whose, which. Whichever, whomever 衔接副词：when, where, how, why 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。
(完整版)高中名词性从句全面讲解及练习(含答案)
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。
高三英语语法名词性从句考点归纳 完整版课件PPT
save them.
AA. whatever B. that
C. which
D. whichever
4. Eat ___ cake you like and leave the others for ___ comes in
late.
A. any; who
cC. whichever; whoever
规律四：（1） what 类词(who/ which/ whom/ when/ where/ how): 有疑问
意义，表示特指概念, 充当成分。 （2） whatever类词 (whoever/ whichever/ whomever/ whenever/
wherever): 有意义，“凡是… 的，无论…的，所有…的”），无疑问意义， 表示泛指概念；充当成分。相当于anyone who, anything that, any one that/ who, any time when, any place where.
规律一：名词性从句中须使用陈述语序！
考点精析 1、语序 practice
1. I have always been honest and straightforward, and it doesn’t matter ____ I’m talking to.
A. who is it
BB. who it is
C 2. ______ (他是否出过国) doesn’t make much difference. (he, abroad)
3. ____ we’ll go camping tomorrow depends on the weather. A. If B. Whether C. That D. Where
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一．单句语法填空1.（2019全国卷I）While they are rare north of 88°,there is evidence they range all the way across the Arctic,and as far south as James Bay in Canada.【答案】that【解析】考查同位语从句。
根据句子结构分析可知，主句为there be句型，且结构完整，空格后为同位语从句，解释说明中心词evidence的内容，故填that。
2. （2018全国卷III）I'm not sure 61 is more frightened，me or the female gorilla (大猩猩) that suddenly appears out of nowhere.【答案】who【解析】考查宾语从句。
句意：我不确定谁受到了更大的惊吓，是我还是那只不知从何处突然出现的雌性大猩猩。
根据句意和句子结构可知，空处引导宾语从句，在从句中作主语，表示“谁”，故填who。
二．单项选择1.（2019江苏卷）Scientists have obtained more evidence ___________ plastic is finding its way into the human body.A. whatB. thatC. whichD. where【答案】B【解析】考查同位语从句。
句意：科学家已经获得更多证据，塑料正在进入人们的体内。
从句不缺句子成分，且与evidence指代的是同一事件，用that引导同位语从句。
故选B。
2.（2018江苏卷）By boat is the only way to get here, which is _______ we arrived.A. whereB. whenC. whyD. how【答案】D【解析】考查名词性从句。
句意：乘船是到达这里唯一的途径，这就是我们如何到达的。
分析which引导的非限定性定语从句可知，后面为表语从句，这里用连接副词how引导表语从句，充当方式状语，表示“如何”。
故选D。
3. （2018天津卷）The gold medal will be awarded to wins the first place in the bicycle race.A．whomever B．whereverC．whoever D．whatever【答案】C【解析】考查名词性从句。
句意：金牌将会被颁发给在自行车比赛中获得第一的任何选手。
本空需要连接词引导宾语从句，连接词在从句中作主语，指人，同时根据句意可知，应用whoever“……的任何人，无论谁”引导这个宾语从句。
名词性从句是高考常考的语法项目，主要考查对连接词的正确把握。
在同位语从句中，经常考查that 的用法。
除此之外，其他连接词的用法以及从句的语序也时有考查。
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四种。
名词性从句中的连接词有从属连词that/whether/if，连接代词what/who/which/whose/whatever/whoever/whomever/whichever，连接副词where/when/why/how/wherever/whenever。
一、that引导的名词性从句(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：(A)当that从句和主句谓语动词之间有插入语时；(B)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；(C)介词except，but，besides，in等后跟that引导的宾语从句时；(D)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”。
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 they expressed is that they would come to visit China again.(定语从句)that引导名词性从句时本身无意义，只起连接作用，也不在句中作任何成分。
它引导的名词性从句结构和意义都完整，往往用于陈述事实。
引导主语从句、表语从句和同位语从句时，that不能省略。
引导宾语从句时，在口语和非正式文体中，that可省略。
但下列情况下，that不可省略：【考题印证】单据语法填空与单句改错1．(2016·江苏高考改编)It is often the case________ anything is possible for those who hang onto hope.【答案】that【解析】句意：通常情况下，对于那些坚持希望的人来说，一切皆有可能。
空处引导主语从句，从句中不缺少任何成分且意思完整，故使用that引导。
2．(2016·天津高考改编)The manager put forward a suggestion ________ we should have an assistant.There is too much work to do.【答案】that【解析】句意：经理提出了一个建议，我们应该有一个助手。
工作太多了。
分析句子结构可知，空处引导同位语从句，解释说明suggestion的具体内容，故填that。
3．(2016·北京高考改编)The most pleasant thing of the rainy season is________ one can be entirelyfree from dust.【答案】that【解析】句意：雨季最令人高兴的事情就是人们可以完全远离灰尘。
分析句子结构可知，本句包含一个表语从句，且表语从句中句子结构完整，故使用that引导表语从句，that在表语从句中不作句子成分，只起连接作用。
4.(2015·全国卷Ⅱ)After looking at the toy for some time, he turned around and found where hisparents were missing. ________________【答案】where改为that或去掉where【解析】found后是一个宾语从句，不缺少句子成分且句意完整，所以不能用where，应该用that引导，that也可省略。
二、that引导主语从句时可用it作形式主语的四大句式1．It＋be＋形容词(necessary, right, likely, unlikely, wrong, important, certain, clear, obvious, strange, normal等)＋that从句It isn't likely that I should accept such an offer as that.我不可能接受像那样的帮助。
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 he didn't want to go.难怪他不想去。
3．It＋be＋过去分词(said, told, heard, reported, decided, suggested, advised, ordered, remembered, thought, considered, wellknown, announced等)＋that从句It is decided that the meeting has been put off until next Monday.会议被推迟到下周一已经定下来了。
[特别注意] 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”。
It is suggested that you (should) spend more time in studying English.建议你花更多的时间学习英语。
4．It＋特殊动词或短语(seem, appear, happen, matter, turn out, occur to, make no difference 等)＋that从句It suddenly occurred to her that Joe was afraid of being alone.她突然想到乔害怕独自一个人待着。