名词性从句复习
名词性从句总复习教案
名词性从句总复习优秀教案第一章：名词性从句简介1.1 理解名词性从句的概念和作用1.2 掌握名词性从句的构成和种类1.3 了解名词性从句与陈述句、疑问句的区别第二章：宾语从句2.1 掌握宾语从句的构成和连接词2.2 理解宾语从句的语序和时态2.3 练习不同类型的宾语从句，如：陈述句、疑问句、否定句等第三章：主语从句3.1 掌握主语从句的构成和连接词3.2 理解主语从句的位置和语序3.3 练习不同类型的主语从句，如：陈述句、疑问句、否定句等第四章：表语从句4.1 掌握表语从句的构成和连接词4.2 理解表语从句的语序和时态4.3 练习不同类型的表语从句，如：陈述句、疑问句、否定句等第五章：同位语从句5.1 掌握同位语从句的构成和连接词5.2 理解同位语从句的语序和时态5.3 练习不同类型的同位语从句，如：陈述句、疑问句、否定句等教学目标：1. 掌握名词性从句的基本概念和构成要素。
2. 能够区分并运用不同类型的名词性从句。
3. 熟练运用连接词，确保名词性从句的语法正确。
4. 通过练习，提高学生在实际语境中运用名词性从句的能力。
教学方法：1. 采用案例分析法，通过实例讲解名词性从句的构成和用法。
2. 采用任务型教学法，让学生在完成实际任务的过程中运用名词性从句。
3. 采用互动式教学法，鼓励学生积极参与课堂讨论，提高学生的口语表达能力。
教学评估：1. 课堂练习：观察学生在课堂练习中的表现，评估学生对名词性从句的掌握程度。
2. 小组讨论：评估学生在小组讨论中的参与程度和语法正确性。
3. 课后作业：检查学生完成课后作业的情况，巩固所学知识。
教学资源：1. 教学PPT：展示名词性从句的定义、构成和用法。
2. 练习题库：提供多种类型的名词性从句练习题，供学生巩固所学知识。
3. 案例素材：提供真实语境中的名词性从句案例，帮助学生理解并运用。
教学时长：每周2课时，共计10周。
每课时45分钟。
教学建议：1. 在教学过程中，注重引导学生分析句子结构，明确名词性从句的作用。
专题复习 名词性从句
专题复习名词性从句名词性从句的基本概念一．名词性从句的概念具有名词的句法功能，在句子中充当主语，宾语，表语和同位语的从句。
eg：1.What has happened proves that our policy is right.2. I have no idea when he will be back.二．引导名词性从句的连词的分类1．连接词：that ，只起连接作用，不充当句子成分，没有任何意思。
whether, (if) 只起连接作用，不充当句子成分，意思“是否”2．连接代词：what , who, whom, which, whose. Whatever, whoever, whomever, whichever, Whosever具有代词功能引导名词性从句，又在句中充当一定的句子成分，（即主，宾，表，定）。
它们的意思与疑问句中疑问词的意思大体相同。
3．连接副词：when, where, why, how, whenever, wherever, however, because 具有副词的句法功能。
在从句中充当状语。
连接副词的意思同疑问句中疑问词的意思大体相同。
三．引导名词性从句的连接词一揽表连接词连接词连接词引导的从句在从句中的意思在从句中充当的句子成分that 主从，宾从，表从，同位从无意义不做成分，起连接作用whether 主从，宾从，表从，同位从是否不做成分if 宾从，只引导动词的宾从是否不做成分连接代词who 主，宾，表，同谁主语，宾语whom 主，宾，表，同谁宾语what 主，宾，表，同什么，所。
的主，宾，表，定which 主，宾，表，同那个，那些主，宾，表，定whose 主，宾，表，同谁的定whoever 主，宾无论谁的主whomever 主，宾无论谁宾whatever 主，宾无论什么主，宾，表，定whichever 主，宾无论哪个主，宾，表，定连接副词when 主，宾，表，同什么时候状语where 主，宾，表，同什么地方why 主，宾，表，同为什么how 主，宾，表，同怎样whenever 主，宾，同无论什么时候wherever 主，宾，同无论什么地方however 主，宾，同无论如何四．名词性从句的来源1．来源于陈述句，引导词用“that”如：1）He came back yesterday.That he came back yesterday made us very happy.2）He didn’t see me when he passed me.He pretended that he didn’t see me when he passed me.3）He will come to see us all.Word came that he would come to see us all.消息传来了，他要来看我们大家。
复习名词性从句
A. how
B. who
C. what
D. which
9. The teacher asks us __ Jim can come
back on time.
A. that
B. if
C. when D. what time
10. Does anybody know __ we will have
a sports meeting this weekend or not.
known yet.
hasn’t
练习__ he wants is a book. 2.It’s obvious __t_h_a_t _____ he wants to go
there. 3.The result is __t_h_a_t_____ we won the
八、Homework: 1.阳光课堂P9. 2.预习Reading
练习：
1. Can you make sure __ the gold ring? (MET 89)
A. where Alice had put B. where had Alice out C. where Alice has put D. where has Alice put 2. ___we need money is quite clear. A. If B. What C. That D. \
14. Someone is ringing the doorbell .
Go and see ___ .
A. who is he
B. who he is
C. who is it
D. who it is
15. Could you tell me how long ___? A. you have bought the watch B. you have kept this science book C. have you been away from China D. have you been a member of Greener China
名词性从句复习(精华)
特征： 后面接谓语/系动词
4
观察2：判断划线部分充当？句子成分
7．The fact is that we have lost the game. 8．That’s just what I want. 9．This is where our problem lies. 10.That is why he didn’t come to the 表m语e从et句ing.
decided.
3.What he wanted to know is the result of
the test.
4. Who will go with the boy is not
important.
5. How you can finish it makes us puzzled. 6. It is known to us how he became a writer
5
(表语从句)
Appositive
Clause
4
（同位语从句）
Subject
1
Clause
(主语从句)
Noun
2
Clauses
(名词性从句)
Object
3
Clause
（宾语从句）
一、观察句子，
判断名词性从句
观察1：判断划线部分充当？句子成分。
1. That he is bad-tempered is known to all. 2.Whether he will come hasn’t been
特征：前面有系动词
1)状态:be, stay, remain, keep 2)感知:look, seem, appear, sound, smell, taste, feel 3)变化:get, become, turn, grow, go, fall
名词性从句复习
4) The fact that that he he has has no no money money worries him.
5) The teacher's decision that there was no homework surprised us.
翻译以下句子，并指出带下划线的从句属于名词性从句 中的哪一种。
That’s what makes you beautiful.
You don’t know (that) you are beautiful.
that what
只起连接作用，无意义，在从句中不充当任
何成分, 且在宾语从句中有时可省。
既起连接作用, 又在从句中作 主语, 宾语, 表
语。
what引导名词性从句时，在从句中作主语，宾语 或表语。
1. It is widely accepted ____ that the earth goes around the sun. That the earths goes around the sun is widely accepted. 2. The problem is _____ that we can’t finish the work in time. 3. We express the hope ________ they will come to that visit China again. that/-- the 2008 Olympic Games 4. We all hope ________ that the athletes and will be the best ever, and ______ visitors will enjoy China and Beijing.
高三语法复习名词性从句(教师版)
高三语法复习第4讲名词性从句名词性从句：主语从句，宾语从句，表语从句，同位语从句名词性从句的引导词可分为引导词1：who,whom, which,what, whatever,whoever,whomever,引导词2：that/ whether ,when, where,why,whose,whenever,wherever,how，however做题方法:首先通过从句所在的未知判断是名词性从句其次分析从句的成分从句中缺主宾表的情况，选择引导词1中的词从句中缺状语或定语，选择引导词2最后，翻译句子，判断逻辑关系引导词的用法1.What引导名词性从句时，要做主语，宾语，表语，要有实际的意义（什么）同样的用法有who，whom,2.that引导名词性从句时，在从句中不充当成分，不可省略，起连接句子的作用3.when，where,why 在从句中充当状语4.whether 的意思是：“是否”，可引导主语从句，不可以换成if 01.主语从句1）从句在主语的位置，也就是从句做主语即为主语从句Eg1. what made me so happy is the good news I received about herEg2.That he wins the first prize in the competition mad me so delighted . Eg3.where I will go hasn’t been decided .Eg4.whether I accept your invitation is up to you.It 做形式主语，真正的主语是从句，常见的句型有It is+ adj(necessary ,important,essential,natural,strange ) that...It is +n(a pity, shame, no wonder) that......It is said /reported/ believed......It seems /appears/matters that.......02宾语从句（在谓语动词后/介词后，一个句子作宾语）Eg1.I didn’t know what he was talking about .Eg2.I always wonder how close the relationship between them.Eg3.I am glad to know that he came back safe and sound .It 做形式宾语主语+ find、make,feel，consider，see to，depend onEg I find it important that we should respect the old people.03表语从句（be动词和系动词之后用句子做表语）Eg1. That is what I want to tell you .Eg2.what confused me is that he should break up with herEg3.By boat is the only way to get here, which is how we arrived.常见的表语从句句型(1)It seems/appears that...(2)This/That is because/why/where/when/how...(3)The question/problem is whether/when/where/how...(4)The suggestion/advice/purpose/aim/goal/dream is that...(5)What从句+be+ that从句例如:What annoyed me most was that he came late again.04同位语从句1）同位语从句的结构：表示内容的先行词+引导词+从句2）同位语从句是对先行词的解释说明3）同位语从句的先行词一般是包含一定内容的抽象名词，如；suggestion、advice、proposal、thought、doubt、belief、news、promise、word、notice、request、requirement，problemEg1. He made a promise to me that he won’t be late for the class once again.4）同位语从句和定语从句的区别定语从句对先行词是起修饰作用，做出限定同位语从句对先行词是解释说明that的用法不同，在定语从句中that是关系代词在从句中做主语宾语表语在同位语从句中，that在从句中不做任何成分Here comes the news that he is admitted to the university.(同位语从句) Here comes the news that I am looking forward to .（定语从句）05wh-ever引导的名词性从句（无论....）1）引导词1：whatever/ whoever/ whomever/whichever（无论哪一个）在从句中做主宾表成分引导词2：whenever/ wherever/however在从句中做状语I can do whatever I want to doWhoever comes to English class late will sing a song for other students2）Wh-ever =no matter wh-Wh-ever 结构可以引导状语从句和名词性从句No matter wh-只能引导状语从句3）wh-和wh-ever 的区别wh-ever 译为无论.....，没有范围和条件wh-指特定的人，事情，地点等Eg1. Who is the next one to answer the question?Whoever answers the question can get a candy .Exercise 11.(2024·天津河西区模拟)_______ I’m concerned about most is_______we can collect a huge amount of money in such a short time. A.That; how B.What; if C.What; how D.As; whether【解析】选C。
名词性从句的复习归纳
定语和表语；而that引导名词性从句，只起连接作用，不
充当任何成分，且在主语从句、表语从句和同位语从句中 不可省略，引导宾语从句作及物动词宾语时可以省略。
Hale Waihona Puke 例句链接】①That he said it at the meeting is reasonable. （主语从句）
【高考体验及易错点分析】 1.（2011天津）Modern science has given clear evidence smoking can lead to many diseases.
考点三：that引导名词性从句与定语从句的区别
【知识必备】：同位语从句对中心名词作进一步的
解释与说明，表明中心词的具体内容，引导词that在从 句中不充当成分也不能省略；定语从句是先行词的修 饰词，引导词that在从句中充当成分，充当宾语时可以
省略。
【例句链接】
①We expressed the hope( that )they had expressed. （定语从句） ②We expressed the hope that they would come to Macheng. （同位语从句） ③The news that we had won the match excitesd us. （同位语从句） ④The news that had been reported excited us. （定语从句）
5.We have no idea what will be there tomorrow at alI. （同位语从句） 我们根本不知道明天会有什么。
高中英语高考名词性从句专项复习(知识点+易错点+练习题)
高考英语名词性从句知识点一、that从句1、主语从句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, probable, 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，偶尔可作except, in的宾语。
3、表语从句(that不可省略)4、同位语从句连词that引导同位语从句时，应在某些抽象名词之后,如：fact, hope, desire, thought, suggestion, idea, news, problem, possibility 等，对前面的名词起补充说明的作用，that 在从句中不担当任何成分，不能省略。
二、whether/if 从句1＞在表语从句和同位语从句中，只能用whether不能用if；当主语从句放于句首时，只能用whether不用if；当it作形式主语，主语从句放在句末时用whether或if均可；discuss后引导宾语从句时，必须用whether。
名词性从句总复习
表语从句
表语从句
系动词后面 1. The truth is that he has never been to the countryside. 实际情况是他从未去过农村. that 一般不省略 2. The question is whether w can finish the experiment by Friday. 问题在于我们能否在明天下午之前完成这项实验. 表语从句不用 if 3. It looks as if it were going to rain.
高考真题中，出现频率第二高 的名词性从句 1. ______ was most important to her, she told me, was her family. （2008山东） A. It B. This C. What D. As 2. ____ matters most in learning English is enough practice. （2007全国II） A. What B. Why C. Where D. Which 3. ______ he referred to in his article was unknown to the general reader. (2007上海) A. That B. What C. Whether D. Where parents say and do has a life-long effect on their children. (2007陕西) 4. A. That B. Which C. What D. As
1. 我们就是这样克服困难的 我们就是这样克服困难的.
This is / That was how we overcame the difficulties.
高考英语语法总复习名词性从句
• 一、名词性从句的种类
• 名词性从句是起名词作用的从句，包括主语从句、宾语从 句、表语从句、同位语从句。
请思考：
1、English is very useful for us . 2、We need to master English well. 3、The subject I am interested in is English. 4、He want to learn the language , English .
• that引导主语从句时，常用it作形式主语，常 见句型有： • ①it＋be＋形容词(如： obvious，true，natural， surprising，good，wonderful，funny，possible， likely，certain，probable，evident，clear， apparent等)＋that从句。 • It is evident that lung cancer is closely related to smoking.
注意：
1. 在口语或非正式问题中，引导宾语从句的that常省略，但 在下面情况下，that 一般不省略 （1） 当一个句子有两个或多个并列的宾语从句时，除第一 个从句的that外，都不可省略。 He told me (that) the power would be cut off and that I should get out. （2）形式宾语it后的that及介词后面的that不能省略。 2. 如果主句主语是第一人称，谓语动词是think ,consider, believe, suppose, expect, fancy, guess, imagine等，后面的宾语 从句含有否定意义，否定转移。 I don't think this dress fits you well. 我认为这件衣服不适合你。
高考英语语法总复习之名词性从句课件
A. What
B. That
C. It
D. As
05. ______ is going to do the job will be decided in tomorrow’s meeting.
A. Which
B. That
C. What
D. Who
宾语从句
陈述
• that He believes that the earth is flat. ➢ that一般可以省略，但在如下情况则不能省
同位语从句
陈述
• that
The news that he has fallen in love has spread across the school.
疑问
• whether
I have no idea whether he’ll come or not.
• wh-/how(-ever)
It is a question how he will get a good score without memorizing words.
that
无意义，不作从句主干成分，在宾从中可省
I hear (that) he has joined the football club.
有意义，不作从句主干成分，不省略
I didn’t know whether/if he would attend the concert.
whether和if
两者区别
1) 并列几个宾语时，从第二个起不省 He believes (that) the earth is flat and that the sun turns around the earth. 2) 有插入语等其它成分干扰 He said, I remember, that he would help you, but…
07.名词性从句-高考英语一轮复习语法知识
类似的可用于该结构的词还有:a pity、a wonder、a good thing、no wonder、a surprise等。 It is good news that our team has won the championship. It is a pity that I have missed a wonderful boxing match.
名词性从句
考点1 引导词 【考题再现】 ①(2024·蚌埠模拟) Beijing will carry out measures to help bridge _w__h_a_t_has become a digital divide for many older people to make sure they share in the benefits of a smart society. ②(2024·芜湖模拟) Many of us read poetry simply because we often feel depressed and hopelessly lost, and in poetry we see __h_o_w__beautiful and strange everything is. ③(2024·北京丰台模拟) To improve efficiency, a tea-picking robot was made and it is in trial operation now.It can position _w__h_e_r_e_the target bud and leaf are and cut them precisely.
【要点巩固】 ①(2024·河南联考) __W__h_a_t_makes the Qatar World Cup unique is the kind of technology China is providing. ②(2024·韶关模拟) But _w__h_a_t_was pleasantly surprising was that the lingering fragrance of the tea and the crunchy texture of the shrimp won the emperor over. ③(2024·潮州模拟) The scientists believe _w__h_a_t_caused whales to get so large was a change in the Earth’s climate only about 3 million years ago.
英语名词性从句知识点
名词性从句复习要点【考点1】名词性从句中连接词的运用：连接代词：what ，who，which，whose，whatever，whoever，whomever，whichever连接副词：where / when / why / how / wherever / whenever，that，whetherEverything depends on whether you have enough time.No one knows what our life will be like in the future.The reason why he was late was that he took the wrong bus.【考点2】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。
如：That they are good at English is known to us all.The problem is that we don’t have enough money.They expressed the hope that they would come to visit China again.(同位语从句)The hope she expressed is that they would come to visit China again.（定语从句）②宾语从句中的连接词that有时可省有时又不可省，在以下几种情况中that不能省略：（A）当that从句和主句谓语动词之间有插入词语或者从句主语之间有插入语时，that 不可省略；（B）当两个并列的宾语从句同时作宾语时，第二个that不能省；（C）当that 作介词宾语时，that不可省掉。
如：He judged that, because he was a child, he did not understand wineEveryone knew what happened and that she was worried.The reason lies in that she works harder than the others do.③that从句作主语和宾语时，可以用it 来替换成以下几种结构表达。
名词性从句复习课件
1.It now appears ______ they are in need of help.
A. that
B. which
C. what
D. how
2.It is good news ______ they will arrive in a few days.
五、否 定 转 移
1) 将think, believe, suppose, expect, fancy, imagine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。
❖ He said (that) he couldn’t tell you right away and that you wouldn’t understand.（第一个可省，第二个不可省略）
❖ We decided, in view of his special circumstances, that we should give him support. （谓语动词与that从句之间有插入语，则that 不可省略。）
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. It's a pity that you should have to leave.
高三语法复习-名词性从句
引导名词性从句的关联词
1
在名词性从句中一律用陈述句的语序，即使从句表达的是疑问含义。
2
The problem is what he has done to the little boy.
3
问题是他对那个小男孩做了些什么。
在句中作主语的句子叫主语从句。
主语从句通常由从属连词that，whether 和连接代词what, who, which, whatever, whoever以及连接副词how,when,where, why等词引导。
2）It + be + 形容词(obvious, true, natural, surprsing , possible, likely, certain, probable, etc.+ that从句 It is certain that she will do well in her exam. It is probable that he told her everything. 3）It + be + 动词的过去分词 (said, reported, supposed, expected, announced,suggested, proposed , desired , etc. ) + that从句 It is said that Mr. Green has arrived in Beijing. It is decided that the meeting has been put off till next Monday.
Everything depends on whether we have enough money.
I don’t care about whether you have money or not. /whether or not you have money . 介词后的宾语从句一般不用which和if引导，要用whether和what。that也很少引导介词宾语从句，只在except, but, in等之后才用。
名词性从句复习最终版
在从句中 的作用
不作成分 只起连接 作用 作主、宾、 表、 定语
作状语
朗读下列句子，指出其中的名词性从句， 辨别其在全句中作何成分。
1. My suggestion is that we should read 表从 aloud. aloud 2. He told me that he lived there alone alone. 宾从 3. The news that I have pass the exam is 同位从 true. 4. It is said that she made a mistake. mistake 主从 5. Our success depends upon how well we 宾从 other can cooperate with each other. 6. What he did made me very angry.
总结3：名从中 that不做成分; what和which均可 作主/宾/表语，但which意为“哪个”, 一般在上下 文中有选择范围。
④从句的语序问题
单选
I don’t know ________. A. from where does he come B. from where he comes from C. where does he come from D. where he comes from
名词性从句的 引导词 连 接 词 连接 代词 连接 副词 that, whether/if（是否） as if /as though(只在表从) what(ever) who(ever) whom(ever) which(ever) whose when(ever), where(ver), why, how, because(表从中)
名词性从句考点复习
何成分, 不可省（在宾语从句及物动词后可省）
what 既起连接作用, 又在从句中作 主语, 宾语, 表
语 (且在名词性从句中只有what可作表语）
He said (that) the text was import and that we should recite it.
(4) 表示"建议、请求、命令、要求、决定等"意思 的名词后面的同位语从句中谓语动词要用虚拟语 气"(should)+do"。如:
They received orders that the work(should)be done at once.
1 It is strange that he _____ without saying good-bye to us
考例2：It is necessary that a college student ______ at least a foreign
☆ language.
A. masters B. should master C.mastered D. will master
(1) 在主语从句中用来表示惊奇、不相信、 惋惜、理应如此等,谓语动词用虚拟语气 “(should) +do”,常用的句型有:
2. 连接代词 ：who、 whom 、whose、 what、
which
作主/宾/
表
3. 连接副词： when、 where、why、how
作状语
1 that 与 what 的区别
What he said makes me happy. That a new teacher will come is true .
复习名词性从句
高中英语复习名词性从句编稿老师关志国一校杨雪二校黄楠审核李文英1. 复习名词性从句的特征、判定及其引导词的选择。
2. 在实际运用中体会名词性从句的语用功能。
重点：名词性从句的判定；名词性从句引导词的功用及其辨析。
难点：名词性从句引导词的选择。
1. 名词性从句是高中阶段英语学习的重点，也是高考的主要考点之一。
做题时一定要学会分析句子结构，理解题干的具体语境，才能有针对性地应考。
2. 名词性从句在高考中的考查重点主要集中在对连接词的正确把握。
近几年连接词what 的用法成为考查的热点。
另外，that和what引导名词性从句的区别；名词性从句的语序和时态；it作形式主语、形式宾语的几种情况以及其他连词的用法也时有考查。
名词性从句相当于名词，可分别作句子的主语、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、宾语从句和同位语从句。
名词性从句中的连接词有连词that / whether / if，连接代词what / who(m) / which / whose / whatever / whoever / whomever / whichever，连接副词where / when / why / how。
We all know what he is doing.（宾语从句）What he is doing is known to us.（主语从句）What we want to know is what he is doing.（表语从句）I have no idea what he is doing.（同位语从句）名词性从句位置特征主语从句（谓语动词之前）宾语从句（及物动词、介词和情感形容词之后）表语从句（系动词之后）同位语从句（抽象名词之后，起解释说明的作用）项目 定语从句同位语从句位置位于名词之后只位于抽象名词之后（fact, truth, thought, idea, message, news, word, problem, question, answer, order, suggestion 等） 功能对先行词起修饰限定的作用 起解释说明的作用，同位语从句即为相关名词的具体内容，可以转换为“名词+be+表语从句”的结构。
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名词性从句名词性从句涉及较为复杂的句式结构，是高中英语的一个重点语法，也是历年高考的高频考点。
通过对近年高考题的分析，2013年高考应着重注意：1、名词性从句引导词的区别；2、that引导的同位语从句与定语从句的区别；3、某些固定搭配及句型在名词性从句中的用法。
名词在句中一般作主语、宾语、表语和同位语。
能象一个名词一样在句中充当这些成分的从句就叫名词性从句。
名词性从句包括主语从句、宾语从句、表语从句、同位语从句。
常用的连接词有：疑问词（who, whom, whose, what, which, where, why, when, how）可以引导主语、宾语和表语从句。
它们的特点是：1、疑问词有本身的词义；2、疑问词在从句中担当句子成分，如主语、宾语或状语；3、这种疑问词引导的从句一律用陈述语序，不能用疑问语序。
下面我们再分别讲述主语从句、宾语从句、同位语从句和表语从句。
一、主语从句1．that 引导主语从句时，that 没有意义，但不能省略。
（that 引导宾语从句时可以省略。
）It worried her a bit that her hair was turning gray.她的头发正在变白，这使她很不安。
That she is a rich woman is known to us all. 众所周知，她是个富有的女人。
We didn’t know (that) you had sold your house. 我们不知道你已经把你的房子卖了。
（注意这句话的时态）2．从句作主语时，多数情况下由it 作形式主语，而把主语从句放在后面，尤其是谓语部分（包括宾语）较短的情况下。
It wasn’t very clear what she meant. 不清楚她是什么意思。
It is important that he should come on time. 他按时来是很重要的。
It is true that that man on the left is a well-known writer here. 左边那个人是本地的一位著名作家，这是真的。
3．whether 既可以引导主语从句也可以引导宾语从句，但if不能引导主语从句。
whether 后面可以加or not, 而if 不能与or not 连用。
作介词宾语时不用if.如：Whether I knew John doesn’t matter. = It doesn’t matter whether I knew John.我是否认识约翰没有关系。
Whether or not she’ll come isn’t clear. = Whether she’ll come or not isn’t clear. = It isn’t clear whether …. 她是否来还不清楚。
It all depends on whether we can get their cooperation. 这是主语从句还是宾语从句？it 是形式主语吗？请翻译这句话。
I worry about whether I hurt her feelings.二、宾语从句在谓语动词、介词、动词不定式、分词、动名词之后都可以带有宾语从句。
某些形容词如sure, happy, glad, certain, pleased 等之后也可以带有宾语从句。
1．that 引导的宾语从句: that 没有意义，在口语或非正式文体中常省略I really feel she’s making a mistake.James said (that) he was feeling better.Hearing that his son was badly wounded, he hurried to the hospital to see him.I suggested that we should go home.虚拟语气，that 一般不能省略。
2．在think, believe, suppose, expect 等动词的宾语从句中，否定不用在从句中，而是将think 等词变为否定形式。
I don’t think the film is interesting.我觉得这部电影没什么意思。
I don’t suppose we are go ing outing tomorrow. 我认为我们明天不会出去郊游。
3．如果从句作宾语而后面还有补语，为了保持句子的平衡，用it 作形式宾语，而将宾语从句放在句尾。
常跟这样的复合宾语的动词有：make, find, see, hear, feel, think, consider, regard, take….for granted等。
George made it clear that he opposed this project.They kept it quiet that he was dead.I took it for granted that you’d stay with us.三、同位语从句同位语从句是对名词的内容给予具体、详细的说明。
常在后面接同位语从句的名词有fact, news, idea, truth, hope, suggestion, question, problem, doubt, fear, belief等。
同位语从句常用的引导词为that,有是也用when, where 等疑问词。
The news that the United States was hit by terrorist attacks took the whole world by surprise. The idea that you can do this work well without thinking is quite wrong.注意：同位语从句的that 只是引导词，没有其他语法作用，在句子中不作句子成分，不能省略；而定语从句中的that 除了引导定语从句外，还是定语从句的一个成分，在定语从句中作主语或宾语，作主语时不能省略，作宾语时可以省略。
The idea that some peoples are superior to others is sheer nonsense.（同位语从句/定语从句。
）The idea that he proposed at the meeting is sheer nonsense.（同位语从句/定语从句。
）No one is happy with the fact that he found out.（同位语从句/定语从句。
）No one is happy with the fact that he will become their boss.（同位语从句/定语从句。
）四、表语从句表语从句位于主句的连系动词之后，在非正式文体中引导词that可以省略。
That’s not what I want.That’s why I have come.。
My opinion is that things will improve.。
One advantage of solar energy is that it will never run out.此外，表语从句还可由as if （好像）引导。
It looked as if it was/were going to rain. （虚拟语气）What I want to know is how he managed to complete the project in such a short time.一、名词性从句连接词的选用：⒈ if 和whether:whether 和if在引导宾语从句时，意思是―是否‖，这时if并没有―假设，如果‖的意思；引导主语从句、表语从句、同位语从句以及介词后之宾语从句，不能用if, 只能用whether；多数情况下引导动词之宾语从句可用if 或whether；whether引导的从句中可以有or not，if 引导的从句一般没有or not。
（2011·山东卷）33．We’ve offered her the job, but I don’t know____ she’ll accept it．【C】A．where B．what C．whether D．which（2011·重庆卷）22．It is still under discussion _______the old bus station should be replaced with a modern hotel or not．【A】A．Whether B．when C．which D．where⒉ that 和what：that 和what都可引导主语从句、宾语从句、表语从句（what通常不引导同位语从句，而that则可以）。
what 除起连接作用外，还在名词性从句中充当成分，可作从句中的主语、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。
（2011·天津卷）13．Modern science has given clear evidence ______ smoking can lead to many diseases．【C】A．what B．which C．that D．where（2011·江西卷）26．The villagers have already known _____ we will do is to rebuild the bridge．【C】A．this B．that C．what D．which⒊其他连接代词和副词的选用：主要根据名词性从句中的具体意义，正确地选择who, which, when, where, why, how等连接词。
这些连接词即有疑问含义，又起连接作用，同时在从句中充当各种成分，其区别从词义上是显而易见的。
whoever, whatever, whichever 等也可引导名词性从句，其意分别为―所…的一切事或东西‖、―任何…的人‖、――…的任可人或物‖等。
如：Whoever wants the book may have it.。
I’ll do whatever I can to help him.。
Buy whichever is cheapest.注意以下受汉语意思影响而弄错的句子：任何人来都欢迎。
误：Who comes will be welcome. / Anyone comes will be welcome正：Whoever comes will be welcome. / Anyone who comes will be welcome.另外，它们也可引导让步状语从句，其意为―无论…‖、―不管…‖，其意相当于no matter who [what, which]。