主语从句详细讲解及综合练习
主语从句强调句讲解练习
主语从句1．定义：用作主语的从句叫做主语从句。
2．引导主语从句的关联词有三类：(1)从属连词that、whether。
如：如：That they were in truth sisters was clear from the facial resemblance between them.很明显，她们确是亲姐妹，她们的脸型很相似。
Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。
从属连词：that，whether等.that 引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但不能省略。
由whether及其他连词引导的主语从句放在句首，句后都可。
If只能放在句中。
(2) （特殊疑问词）连接代词who, whom, whose, what, which, whoever, whatever, whichever如：___which_______watch was lost is unknown._____what_____she did is not yet known. 她干了什么尚不清楚。
__which________side will win is not clear.Whoever comes is welcome. 不论谁来都欢迎。
(3) （特殊疑问词）连接副词where, when, how, why，wherever，whenever，however。
___________ he did it remains a mystery.When they will start is not known yet.How this happened is not clear to anyone. 这事怎样发生的，谁也不清楚Wherever you are is my home ---- my only home.你所在的任何地方就是我的家----我唯一的家。
初中英语主语从句
初中英语主语从句主语从句是英语语法中的一个重要概念，在句子中起到主语的作用。
掌握主语从句的用法对于提高英语的句子结构和语法的准确性至关重要。
本文将详细介绍初中英语主语从句的定义、用法、结构以及常见的引导词。
同时，提供一些例句和练习，帮助读者更好地理解和应用主语从句。
一、定义主语从句，顾名思义，即可在句子中作主语的从句。
它通常由连词引导，放在句首，并且在句子中起到主语的作用。
主语从句可以是一个完整的句子，也可以是一个简单的短语。
二、用法1. 主语从句可以替代一个复杂的名词短语作为句子的主语，使句子更加简洁明了。
例如：- Whether she will come to the party is still unknown.（她是否会来参加聚会还不确定。
）- What you said is very important.（你说的话非常重要。
）2. 主语从句常出现在以"It is"开头的句子中，这种句子结构被称为"It is"句型。
主语从句位于"It is"之后，形成强调句型。
例如： - It is important to learn a foreign language.（学习一门外语很重要。
）- It is necessary that we should protect the environment.（我们有必要保护环境。
）3. 主语从句可以通过引导词来引导，根据不同的情况选择合适的引导词。
下面是一些常见的引导词及其用法：- Whether（是否）：用于对一个选择或问题进行提问。
例如：I don't know whether he will come or not.（我不知道他会不会来。
） - That（是否）：用于对一个陈述性语句提问。
例如：That he is a doctor is well-known.（他是医生是众所周知的。
理解中的主语从句和表语从句练习题及
理解中的主语从句和表语从句练习题及解答主语从句和表语从句是英语语法中重要的从句结构，它们在句子中起到了关键的作用。
本文将为您提供一些关于主语从句和表语从句的练习题及解析，帮助您进一步理解和掌握这两种从句。
练习题一：主语从句1. _________ is important to stay hydrated during hot summer days.A. HowB. WhenC. ThatD. It2. _________ she told me was a complete surprise.A. WhatB. WhoC. WhenD. Where3. _________ will attend the meeting is not yet confirmed.A. ThatB. WhatC. HowD. Who4. _________ the book is not easy to understand.A. WhetherB. ThatC. WhatD. When5. _________ we need is more time to complete the project.A. WhyB. WhatC. WhenD. How练习题二：表语从句1. My biggest fear is _________.A. that I will fail the examB. when the exam will startC. how difficult the exam isD. why I need to take the exam2. The truth is _________ most people are not aware of the consequences.A. whenB. whereC. whatD. why3. Our goal is _________ a sustainable future for generations to come.A. whyB. howC. whatD. when4. The problem is _________ we don't have enough resources.A. howB. whyC. whenD. where5. His belief is _________ hard work and dedication are key to success.A. whatB. thatC. whenD. where解析：练习题一：主语从句1. D. It。
高中英语高考复习主语从句翻译练习(附参考答案和知识讲解)
高考英语主语从句翻译练习班级_考号姓名总分1.据估计，上海每年春节要接待几百万游客。
(It)2.还不知道是什么原因造成这次森林火灾。
(cause)3.你要一个人完成那项任务似乎很困难。
(seem)4.无论他为他的父母做什么，都会让他们很开心。
(top)5.据报道，很多大学生想毕业后自己创业。
(report)6.我突然想到我忘记通知他们考试的时间了。
(occur》7.这个课程的创新之处在于它很大程度上尊重了小学生的学习(What)8.据说每天喝适量的葡萄酒可以使人保持年轻。
(stay)9.他从没想到两家公司都会给他工作机会，但是他不知道该如何选择，因为它们都是行业内的翘楚。
(occur)10.随着社会竞争日益加剧,青年人掌握至少两门语言是十分必要的。
(It)11.将来过怎样的生活取决于你自己。
(be up to)12.这个游戏的独特之处在于它让孩子学会如何应对现实生活中的问题。
(What)13.建议该实验在低温下操作。
(suggest)14.任何能够采用新方法解决这道技术难题的人,都将受到奖赏。
(Whoever)15.让这所学校自豪的是超过90%的学生都被重点大学录取。
(What)16.人们普遍认为在公共场合大声说话是不文明行为,应该避免。
(It)17.我从未想到那些偏远山区的孩子们生活条件如此艰苦。
(occur)18.随着科技的发展，电脑是否会取代传统的教学方式成为了当下最热的话题之一。
(substitute)19.因为蓝色是天空和海洋的颜色,所以蓝色自然常和冷静,可靠和喜爱平静生活联系在一起。
(natural)20.但凡家境殷实的单身汉，必然想娶妻成家，这是举世公认的道理。
(It)附：参考答案1.It is estimated that Shanghai receives millions of visitors every Spring Festival.2.What caused the forest fire is still unknown.3.It seems very difficult that you are to complete the task alone.4.Whatever he does for his parents makes them feel on top of the world.5.It is reported that many college students want to start their own business after graduation.6.It suddenly occurred to me that I had forgotten to inform them of the time for the exam.7.What is original in this course is that it respects pupils， study habits to a great extent.8.It is said that drinking a proper amount of wine every day can help one to stay young.9.It never occurred to him that the two companies would both give him a job offer, but he didn，t know which to choose, because both of them belong to the top of the industry.10.It is necessary for the young to master at least two languages with the social competition getting increasingly fiercer11.It's up to you what kind of life you will lead in the future12.What makes this game peculiar lies in that it teaches kids how to handle the problems in real life.13.It is suggested that the experiment should be made under a low temperature.14.Whoever can adopt a new approach to solving the technical problem will/shall be awarded.15.What made the school proud was more than 90% of the students had been admitted to key universities.16.It is generally believed/ considered/ thought that talking loudly in public is uncivilized and should be avoided17.It never occurred to me that the living conditions of the children should be so hard in the remote mountainous areas18.With the advancement of technology, whether computers will substitute for traditional teaching means has become one of the hottest topics nowadays.19.Since blue is the colour of the sky and the sea, it is only natural that it should often be associated with calmness, reliability and preference for a peaceful life.20.It is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife.附：知识讲解主语从句就是从句作句子主语,一般放在句首，即主句谓语动词之前。
主语从句超全讲解加练习
误:ＩfMaryrｅａllyｈｅaｒdhimis reallyｄoubｔｆul.
正: Wｈｅｔｈer Marｙrｅaｌlyheａrdhｉｍｉsｒｅａlly dｏubtful.
Cｏmpｌeｔetheｓｅntｅnｃｅs usｉng whａt, wheｔhｅr,ｗｈere,wheｎ, whｏ,ｗｈｙ, hｏwｏr tｈａt.
Wｈｅnｔhey wｉlllｅａvｅiｓ ｎoｔｄecided.
Howwewillpaint thehousｅhasnｏｔbeｅｎdecｉdeｄ.
注意:
1)主语从句在句首时，必须由连接词引导,不能省略这些连接词
误:Ｔｈey should lｉｋe eaｃh other isｎatｕrａl.
正：Ｔhａt thｅyshｏuld like each othｅrｉsnａtuｒal
(Who, whom，wｈicｈ，wｈat可以和ever构成合成词,和wｈat一样引导从句，ｅｖer起到强调作用。它们在句子中担任主干成分，并用陈述句形式)
What mａnｙ ｓcｉentiｓｔsｂｅlieve istｈaｔtｈe eartｈiｓrｏunｄ…
Whoｗｉｌl taｋｅpaｒｔin theｍeeting haｓｎoｔbｅen deｃidｅｄ.
Ｉt iｓobｖiｏus thａｔ…很明显…
Iｔ ｉs necｅssary＼ｉｍｐｏrtaｎｔ\natuｒaｌ\..．tｈat…+(sｈｏulｄ)do
_＿__＿_＿_＿__＿＿__＿（很可能）shｅwillcｏme bacｋtomorrow.
*＿__＿＿_＿__＿_____＿＿(很明显)ｔhiｓmeａsurｅiｓeffectiｖｅ.
(完整word版)主语从句超全练习题及答案
主语从句练习题[即学即用]I. 用适当的词填空，使句子意思完整。
1。
______ he didn’t attend the meeting yesterday wasn’t quite clear。
2。
The Foreign Minister said, “It is our hope ______ the two sides will work towards peace.”3. ______ team will win the match is still unknown。
4. ______ comes to the party will receive a present.5。
______ Mary has left is still a question.6。
It’s reported ______ three people were killed in the accident and five were hurt badly.7。
______ he solved the problem successfully interested all of us.8。
We usually think ______ we can’t get seems better than what we have.9。
It is a fact ______ English is being accepted as an international language。
10. ______ is to be sent there to solve the problem hasn't been decided.II。
下列各句中均有一处错误，请改正。
1。
That the old man’s son wanted to know was where the gold had been hidden。
名词性从句详解及练习
各类从句详解英语从句可以分为名词性从句、定语从句和状语从句三大类：下面我们逐一进行说明：一、名词性从句（主语从句、表语从句、宾语从句、同位语从句）主语从句、表语从句、宾语从句和同位语从句在复合句中的充当的成分和其名称相同，分别作主句的主语、表语、宾语和同位语。
上述这四种从句均被称为名词性从句。
所有的名词性从句均不能用逗号分开，并且它们都用相同的关联词，关联词如下：①主从连词：that (无意义), whether (是否), if (是否)（在句子中不充当任何成分）②连接代词：who (谁), whom (谁), whose (谁的), what (什么), which (哪一个)③连接副词：when (什么时候), where (什么地方), how (怎样), why (为什么)主从连词只起连接作用，连接代词和连接副词除了起连接作用外，还充当从句某一个成分。
另外，可以用whatever, whichever, whoever, who(m)ever等连接代词引导名词性从句，来加强语气。
下面分别对各种名词性从句进行介绍（一）主语从句（subject clause）在主句中用作主语的主谓结构称之为主语从句。
例如：That he will come to the discussion is certain.他来参加讨论是确定的。
That the moon moves round the earth is well known to all of us.月球绕地球转动，这是我们大家都熟知的。
When the meeting is to be held has not yet been decide.会议什么时候召开还没有决定。
主语从句放在句首，句子常常显得比较笨重，因此通常可以把it放在句首，作形式主语，而将主语从句放在后面。
例如上面的句子可以分别改写为：It is certain that he will come to the discussion.It is well known to all of us that the moon moves round the earth.It has not yet been decide when the meeting is to be held.下面再举一些例句：What they are after is profit.他们追求的是利润。
(完整版)主语从句练习及答案
1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimateC. They are estimatedD. It is estimated that2. _____ was once regarded as impossible has now become a reality.A. ThatB. WhichC. WhoD. What3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ you say now can’t make up for what you’ve done.A. No matterB. WhateverC. HoweverD. That5. Although _____ happened in this developed country sounds like science fiction, it could occur elsewhere in the world.A. whichB. whatC. howD. it6. _____ she had forgotten to take her notebook.A. That occurred to herB. She occurred thatC. To her that occurredD. It occurred to her that7. I am sure that _____ she said is wrong.A. whichB. allC. thisD. what8. We lost our way in the forest, and _____ made matters worse was that it was getting dark.A. thatB. whichC. itD. what9. _____ occurred to him that he had forgotten to lock the door when he left home.A. ThisB. ItC. ThatD. These10. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming11. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether12. It is _____ that the bridge has existed for more than three centuries .A. appearedB. risenC. saidD. born13. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which14. _____ is a spell of warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need15. _____ is a pity that he failed in the race.A. WhatB. ThatC. HeD. It16. _____ a spoonful of soil can tell us so much about the structure and early history of the moon.A. RemarkableB. Quite remarkablyC. It is remarkable thatD. It is remarkable17. _____ you nominate will be elected.A. WhoB. WhichC. WhomeverD. That’s18. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That’s19. _____ is troubling me is that I don’t have much experience in international commerce.A. ItB. ThatC. WhichD. What20. _____they wil go there to try another experiment has not been decided yet.A. WhetherB. IfC. About whetherD. Why根据提示，完成句子。
主语从句练习题及答案
主语从句练习题及答案一、主语从句练习题1. ______ is not known is whether the meeting will be held tomorrow.A. IfB. WhatC. ThatD. Which2. ______ she said surprised me a lot.A. WhatB. WhetherC. ThatD. Which3. ______ is certain is that he will stay in Paris for a year.A. WhatB. WhetherC. ThatD. Which4. ______ studying abroad is expensive, many students still choose to do so.A. WhatB. IfC. ThatD. Which5. ______ made her angry was his rude behavior.A. WhatB. WhetherC. ThatD. Which二、主语从句练习题答案1. B. What2. A. What3. C. That4. A. What5. C. That三、文章练习题主语从句是句子中的一个句子成分，用来作为句子的主语，它常常以连接代词或连接副词的形式出现。
在句子中，主语从句常常起到引导词，引导句子的作用。
以下是几个关于主语从句的练习题。
练习题1：______ is not known is whether the meeting will be held tomorrow.练习题2：______ she said surprised me a lot.练习题3：______ is certain is that he will stay in Paris for a year.练习题4：______ studying abroad is expensive, many students still choose to do so.练习题5：______ made her angry was his rude behavior.答案：1. B. What2. A. What3. C. That4. A. What5. C. That通过以上练习题，我们可以锻炼和巩固对主语从句的理解和应用能力。
主语从句讲解加练习(1)
4.(__W__h_o_ can join in the sport meet) is decided by the teacher. 5.(W__h_e_t_h_e_r_ it will rain or not) is not clear.
It is a pity/shame that... 遗憾的是…… It is a surprise that…令人惊奇的是… It is a fact that… …是事实 It is common knowledge that… …是常识
*__It_i_s_a__p_i_ty__th_a_t__(很遗憾)we lost the match.
Unit4 Grammar
Noun clauses as the subject
名词性从句
主语
Find the subjects in the following sentences.
1. A tree has fallen across the road. 2. You are a student. 3. To find your way can be a problem. 4. Smoking is harmful to you. 5. What she said is not yet known. 6. That we shall be late is certain. 7. It’s certain that we shall be late.
最新主语从句详细讲解及综合练习资料
主语从句一、概念：在复合句中起主语作用的从句叫主语从句。
（一）连接词从属连词：that、whether；关系代词：who, what, which , whom, whose, whatever, whoever, whomever, whichever；关系副词：when, where, how, why, however, whenever, wherever等；例：What he said is true.That you don’t like him is none of my business.Whether the football game will be played depends on the weather.主语从句的时态：不受主句的时态影响和限制。
（1）______ he finished writing the composition in such a short time ______(惊讶) us all.（2）______we will go for an outing tomorrow ______（remains，remained）unknown.（3）______ will be our monitor ______(be) decided yet.（4）______we must study for ______ (be) a question of great importance.（5）______ caused the accident ______（remains，remained）unknown.（6）______ you did ______ (be)right.（7）______ watch ______(be) lost is unknown.（8）______we need ______(be) time.（9）______ we need ______(be) good doctors.小结:（1)主语从句的时态：不受主句的时态影响和限制。
主语从句 讲解与练习
C.It+be+过去分词 (said, reported, thought, expected, announced, arranged, etc.) +that从句 It is said that Mr. Green has arrived in Beijing.
D.It+(seems, happens, appears等不及物动词及短 语)+that从句 It happened that I was out that day. It seems that she is not in a good mood.
E.It+(doesn’t matter, makes no difference,etc)+ 连接代词或连接副词引导的 主语从句 It doesn’t matter whether she will come or not.
ቤተ መጻሕፍቲ ባይዱ
主语从句与强调句的区别
1). 在主语从句中，把It be … that 去掉之后，句子成分不完整；在 强调句中，则是个完整的句子； 2). 主语从句多种引导词；强调句 的引导词只有：that, who。
What you said is of great importance. How he was successful is still a puzzle.
3.主语从句置于句首时，必 须由连接词引导，不能省略 这些连接词；但是如果用it 作形式主语，主语从句后置 时，则从属连词that可以省 略。 That he is a hero is known by everyone.
Subject Clauses 主语从句
A tree has fallen across the road.
史上最全的主语从句讲解及其练习
主语从句一、主语从句的连词分三类（1）从属连词引导的主语从句（that whether if）that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。
That 引导主语从句通常用it 作形式主语。
That she survived the accident is a miracle.whether有含义(是否)/在句中不做成分/不可以省。
注意：引导主语从句，不能用if不能在开头，只能用whether。
Whether she is coming or not doesn’t matter too much.（2）用连接代词引导的主语从句在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分.例如Whatever we do is to serve the people.注：whatever / whoever的功用whatever = anything that; whoever = anyone who。
要注意和whatever, whoever 引导的让步状语从句的区别。
如：Whoever breaks the law should be punished. （主语从句）（＝Anyone who breaks the law should be punished. ）Whoever breaks the law, he should be punished. （让步状语从句）（＝No matter who breaks the law, he should be punished. ）（3）用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。
)例如:Where we should leave it is a problem.When they will come hasn’t been made pubic.三、it 作形式主语的主语从句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。
主语从句翻译讲解及练习
tomorrow depends on the weather. 她干了什么尚不清楚。 What she has done is not clear. 她去了哪儿，还不知道。 Where she has gone is not known.
句子翻译练习
你需要的是更多的练习。 What you need is more practice. 他是否加入我们，没有太大的差别。 It doesn’t make any difference whether they join us
or not. 很明显他已经尽力而为了。 That he has done his best is obvious. 他们什么时候来还不知道。 When they will come is still not known.
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……
形式主语句
c.
It + be +名词+ that-从句
It is common knowledge that… ……是常识
句型二：Whether + 完整句=名词
Whether you can succeed in making your dream come true depends on hard work more than luck.
Whether computer can replace the role of teachers has long been a hot topic.
高中主语从句练习题及讲解答案
高中主语从句练习题及讲解答案# 高中主语从句练习题及讲解答案## 练习题1. 题目一：尽管他很年轻，但他已经是一位成功的企业家了。
- 例句：_________ he is very young, he has already becomea successful entrepreneur.2. 题目二：无论你什么时候来，我都会在这里等你。
- 例句：_________ you come, I will be here waiting for you.3. 题目三：他相信他能通过这次考试，这让他的父母感到非常高兴。
- 例句：He believes that he can pass the exam, which makes his parents very happy.4. 题目四：我们不知道他是否已经完成了作业。
- 例句：We don't know _________ he has finished his homework or not.5. 题目五：她害怕黑暗，这是众所周知的。
- 例句：She is afraid of the dark, which is _________.## 讲解主语从句是作为动词或介词的宾语的从句，它通常位于句首。
主语从句可以由连接词that, if, whether等引导。
- that引导的主语从句：用来陈述一个事实，通常可以省略。
- if/whether引导的主语从句：用来表达“是否”，通常不能省略。
## 答案1. 答案一： Although/Though _________ he is very young, hehas already become a successful entrepreneur.- 讲解：这里使用了“Although”或“Though”来引导让步状语从句，表示尽管他年轻，但他已经成功。
2. 答案二： Whenever _________ you come, I will be herewaiting for you.- 讲解：“Whenever”引导主语从句，表示无论何时你来。
主语从句详解及练习_附答案
高二年级语法要点剖析（李翌洋）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：（1）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。
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 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that…2. 宾语从句名词句用作宾语的从句叫宾语从句。
主语从句超全练习题及答案
主语从句超全练习题及答案主语从句练题I.用适当的词填空，使句子意思完整。
1.Why XXX.2.The Foreign Minister said,“It is our hope that the two sides will work towards peace.”3.Which team will win the match is still unknown.4.XXX to the party will receive a present.5.Whether Mary has left is still a n.6.It’XXX.7.XXX us.8.We usually think what we can’t get seems better than what we have.9.It is a fact that English is being accepted as an nal language.10.Who is to be sent there to solve the problem hasn’t been decided.II.下列各句中均有一处错误，请改正。
1.What the old man’s son wanted to know was where the gold had been hidden.2.It XXX.3.XXX his task on time is of great importance.4.Whether the 2008 Olympic Games will be held in Beijing XXX(改为：That the 2008 Olympic Games will be held in Beijing XXX.)5.XXX。
XXX is to walk in space.6.The last person leaving the room should turn off the lights.7.The reason why they will solve the us problem today has not been decided yet.8.It is still XXX.9.It is currently unknown whether our spring sports meet will be held this week or not.10.It'XXX.主语从句研究指导：1.That the earth travels round the sun is a well-known fact.2.It is uncertain whether the artist can do it or not.3.Who will play the lead in the play has not been decided yet.4.Where the young man has gone is not known.5.When and where the test will be given is not yet decided.常见错误展示：1.It is common knowledge that light travels XXX.2.XXX.3.What the professor said is of great importance.4.Where the trees will be planted has not been decided。
主语从句讲解和练习题
主语从句讲解和练习题公司内部编号：（GOOD-TMMT-MMUT-UUPTY-UUYY-DTTI-高考英语主语从句定义：用作主语的从句叫主语从句，它是名词性从句之一。
主语从句的时态：不受主句的时态影响和限制。
引导主语从句的连接词有：从属连词: that, whether；连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)；连接副词: when, where, how和why。
连接词：1. 从属连词：that， whether1）that引导主语从句只起引导作用，在主语从句中不充当任何成分，that本身无实际意义，但不能省略。
2）whether意为“是否”，放在句首句末皆可。
由whether引导的名词从句做主语，表语，介词宾语，同位语时！不可用if代替。
price will go up is certain.b. Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
2. 连接代词who ，what ，which, whatever, whichever, whoever (Who, whom, which, what可以和ever构成合成词，和what一样引导从句，ever起到强调作用。
此类主语从句不能用形式主语it引导，它们在句子中担任成分，不能省略，语序为陈述语序，既有疑问含义,又起连接作用,同时在从句中充当各种成分。
Which side will win is not clear. Whoever breaks the law will be punished.Whatever he did is right. Who killed the scientist remains a question. 1）What和that引导的主语从句的区别：that 只起引导作用，不充当任何成分，没有意思。
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主语从句一、概念：在复合句中起主语作用得从句叫主语从句。
（一）连接词从属连词：that、whether；关系代词：who, what, which , whom, whose, whatever, whoever, whomever, whichever；关系副词：when, where, how, why, however, whenever, wherever等；例：What he said is true、That you don’t like him is none of my business、Whether the football game will be played depends on the weather、主语从句得时态：不受主句得时态影响与限制。
（1）______ he finished writing the composition in such a short time ______(惊讶) us all、（2）______we will go for an outing tomorrow ______（remains，remained）unknown、（3）______ will be our monitor ______(be) decided yet、（4）______we must study for ______ (be) a question of great importance、（5）______ caused the accident ______（remains，remained）unknown、（6）______ you did ______ (be)right、（7）______ watch ______(be) lost is unknown、（8）______we need ______(be) time、（9）______ we need ______(be) good doctors、小结:（1)主语从句得时态：不受主句得时态影响与限制。
（2)连词位于句首不能省略（3)主语从句大多数情况下视为三单,但也有例外,如例91、从属连词that，whether引导得主语从句。
从属连词that，whether在主语从句中得作用只就是引导主语从句，在从句中不担任成分，不能省略。
例：__________ they will go is certain、__________ she will come or not is still a question、__________ she's coming or not doesn't matter too much、2、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。
That引导得主语从句可用it代替，that 不可省略。
用作it作形式主语得结构：（1）It is/was +形容词+that 从句It’s natural that…很自然……It’s obvious that …显而易见……It’s fortunate that …幸运得就是It’s (im)possible…（不）可能……It’s unlikely that…不可能It’s strange that…奇怪得就是……（2）It is/was +名词+that 从句It’s a pity that…遗憾得就是……It’s a fact that …事实就是……It’s good news that…就是好消息……It’s a wonder that…不足为奇……It’s an honour that…非常荣幸……It’s a shame that…真就是可耻……It’s common knowledge that …就是常识…（3）It +不及物动词+that 从句It seems that…似乎……It happened that…碰巧……It appears that…瞧来……It turns out that…结果……（4）It is/was +过去分词+that 从句It’s not known that………不得而知It’s said that…据说……It’s reported that…据报道……It’s decided that…尚未决定It’s believed that…据认为……It’s announced that…据宣布……It suddenly struck me (occur to me that…我突然想到（感觉到）……（5）其她It doesn’t matter …就是无关紧要得It makes no difference …毫无区别……It is of little consequence that…无关紧要It is a pity __________ she has made such a mistake、她犯这样得错误就是令人遗憾得事。
It's strange __________ he didn't come yesterday、她昨天没来就是很奇怪得。
It is reported __________ the number of wild animals in Africa is decreasing、据报导非洲野生动物得数量正在减少。
It is said __________ there was a terrible plane crash this morning、据说今天早上有一起可怕得飞机坠毁事故。
1）主语从句在句首时，必须由连注意:接词引导，不能省略这些连接词；但就是如果用it做形式主语，而把主语从句放在句末时，从属连词that可以省略。
误：They should like each other is natural、正：That they should like each other is natural、正：It is natural that they should like each other、2)如果主语从句放在句首，不能用if引导，但就是如果用it 做形式主语，而把主语从句放在句末时，也可以用if引导、误：If Mary really heard him is really doubtful、正：It was doubtful if Mary really heard him、4) 、用于It is important / natural / necessary / impossible that、、、句型中, 主语从句应使用虚拟语气, 谓语动词用\“should + 动词原形\”得形式, should有时可以省略。
5) 在It + be+suggested/advised/ordered/requested/ insisted/required 中, that从句得谓语也应该用\“should + 动词原形\”得形式, should有时可以省略。
Does _______ matter if he can't finish the job on time ?A、this B、that C、he D、it_______ is a fact that English is being accepted as an international language、A、ThereB、ThisC、ThatD、ItIt is necessary that a college student _______ at least a foreign language、A、mastersB、should masterC、masteredD、will master_______ is known to everybody, the moon travels round the earth once every month、A、ItB、AsC、ThatD、What3、由关系代词引导得主语从句。
（1）关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等，引导主语从句时，它们分别在从句中担任主语、宾语或定语，不能省略。
__________ leaves the room last ought to turn off the lights、走得最晚得应当关灯。
__________ you have done might do harm to other people、您得行为可能伤害别人。
__________ he said at the meeting astonished everybody present、她在会议上得发言时所有入会者吃惊。
__________ made the long distance call is not important、谁打得长途电话并不重要。
（2）what引导主语从句“……得东西/事情”时，可用来表示the thing(s)which这种意思，引导从句，表示一样东西与一件事情，这种用法得what称为关系代词型what，who，whom，which，what可以与ever构成合成词，与what一样引导从句，ever起强调作用。
这些关系词在句子中充当成分，所以不能省略。
此类主语从句不能用形式主语it引导。
__________ (=The thing which I need) is a mobile phone、我所需要得就是一部移动电话。
__________ leaves the office (=Any one who leaves the office)should tell me、无论就是谁离开办公室都应该告诉我。
4、关系副词引导得主语从句。
连接副词有when, where, why, how, however, whenever, wherever等引导主语从句时，它们在从句中担任状语，不能省略。
此类主语从句可以转换为以it作形式主语得句子。
__________ he didn't come here is not clear to anyone、她为什么没来谁也不清楚。
__________ a telephone works is a question which not everyone can answer、电话就是怎样工作得，这个问题并不就是每个人都能回答。
__________ she has gone is not known yet、她去了哪儿，还不知道。