主语从句超全讲解加练习
主语从句讲解及其练习
主语从句讲解及其练习主语从句是一个句子，用作句子的主语。
主语从句有三种连词类型。
第一种是从属连词引导的主语从句，包括that、whether和if。
其中，that引导主语从句时，that本身没有意义，不做成分，不能省略。
例如：It seems unlikely that you will win the medal。
主语从句通常用it作形式主语。
而whether引导主语从句时，whether本身有意义（表示“是否”），不能省略。
注意，不能用if引导主语从句，只能用whether。
例如：Whether we will hold a party in the open air tomorrow depends on the ___.第二种是由连接代词引导的主语从句，包括who、whose、whom、which、what、___、whomever、whichever和whatever。
连接代词在句中起名词性作用，担当一定成分。
例如：What you need is ___ we do is to serve the people。
注意，whatever和whoever在主语从句中不含疑问意义，可以在从句中作主语、宾语、表语等。
例如：Whoever breaks the law should be punished。
Whoever breaks the law。
he should be punished.最后，要注意主语从句的格式和语法正确，避免明显的段落错误。
三、形式主语it的使用有时为了句子的平衡，我们会在主语从句处使用形式主语it，将真正的主语从句放到句末。
这种情况分为四种情况：1) 对于以连词that引导的主语从句，通常用形式主语it替代主语从句，形式为It is + 名词 + 从句。
例如：It is a fact that…（事实是……）It is good news that…（是好消息）___…（是个问题）It is common knowledge that…（是常识）类似的名词还有：a pity、a wonder、a good thing、no wonder、surprise等。
高中英语公开课主语从句讲解练习及答案
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。
(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。
(完整版)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）附属连词指引的主语从句（ that whether if）that 指引的主语从句 :指引词 that 无含义 /在句中不做成分 /不可以够省。
That 指引主语从句往常用it 作形式主语。
比如： That you will win the medal seems unlikely.That she survived the accident is a miracle.whether指引的主语从句:whether有含义(能否 )/ 在句中不做成分/不可以够省。
注意：指引主语从句，不可以用if 不可以在开头，只好用whether。
Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn ’t matter too much.（2）用连结代词指引的主语从句在由连结代词who, whose, whom, which, what, whoever, whomever, whichever, whatever指引的名词性从句中，其连结代词在句中起名词性作用，担当必定成分.比如： What you need is more practice.Whatever we do is to serve the people.注： whatever / whoever 的功用whatever, whoever 在主语从句中不含疑问意义。
它指引主语从句，并在从句中作主语、宾语、表语等。
whatever = anything that; whoever = anyone who 。
要注意和whatever, whoever 指引的退步状语从句的差别。
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. （退步状语从句）（＝ No matter who breaks the law, he should be punished.）（3）用连结副词 when, where, why, how 指引的名词性从句 (其连结副词有含义 ,在句中作状语。
高中英语语法主语从句讲解及练习
主语从句一、概述：在句子中起名词作用的各种从句统称为名词性从句。
根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.主语从句主要有四类：（1）由连词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。
例如：That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.（2）用连词whether引导的主语从句: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，只能用whether。
例如：Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn’t matter too much.（3）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：What you need is more practice.What I want to know is this.Whatever we do is to serve the people.注：whatever/whoever的功用whatever,whoever在主语从句中不含疑问意义。
它引导主语从句，并在从句中作主语、宾语、表语等。
whatever=anything that;whoever=anyone who。
要注意和whatever,whoever引导的让步状语从句的区别。
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.
主语从句讲解和练习题
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。
a.That 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。
What 不仅起引导作用，还要充当一定成分(主语、宾语或表语)，意思是：“什么”。
主语从句讲解及练习PPT文档共25页
21、没有人陪你走一辈子，所以你要 适应孤 独，没 有人会 帮你一 辈子， 所以你 要奋斗 一生。 22、当眼泪流尽的时候，留下的应该 是坚强 。 23、要改变命运，首先改变自己。
24、勇气很有理由被当作人类德性之 首，因 为这种 德性保 证了所 有其余 的德性 。--温 斯顿． 丘吉尔 。 25、梯子的梯阶从来不是用来搁脚的 ，它只 是让人 们的脚 放上一 段时间 ，以便 让别一 只脚能 够再往 上登。
谢谢
11、越是没有本领的就越加自命不凡。——邓拓 12、越是无能的人，越喜欢挑剔别人的错儿。————老子 14、意志坚强的人能把世界放在手中像泥块一样任意揉捏。——歌德 15、最具挑战性的挑战莫过于提升自我。——迈克尔·F·斯特利
(完整版)主语从句超全练习试题和答案解析
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.2. It is reported when China has successfully sent Shenzhou VI spaceship into space.3. If he can finish his task on time is of great importance.4. Whether the 2008 Olympic Games will be held in Beijing excited the whole nation.5. After Yang Liwei succeeded in circling the earth, which our astronauts desire to do is walk in space.6. Whatever leaves the room last ought to turn off the lights.7. Why they will solve the serious problem today has not been decided.8. When will win the English competition is still a problem.9. How our spring sports meet will be held or not this week is not known yet.10. It’s strange when he should have gone away without telling us. GRAMMAR主语从句学习指导[寻规找矩] 请观察下列句子，注意主语从句的用法。
名词性从句之主语从句精讲(含例题) 课件36张ppt
在句子中担当主语的是一个从句,这 个从句就叫做主语从句。
主语从句
定义：在复合句中充当主语的从句即为主语从句。
谓语
T连h接a词t he主w语ill succeed is certain That he will succeed 从句做主语 系动词 表语
主语从句的引导词
连接词：that, whether, if 连接代词：what(ever), which(ever), who(ever), whom(ever), whose 连接副词：when(ever), where(ver), how, why
连接代词： what, which who, whom, whose, whatever, whoever,whomever, whichever等引导的主语从句
连接代词： 连接主句和从句，在从句中充当主语、宾语、表语、定语 主语、宾语、表语：what(ever), who(ever), whom(ever) 定语：whose, which, whichever
左侧句子中包含有主语从句，请 观察这些句子，思考解决下面的 问题：
1.找出从句 2.从句的位置 3.思考什么是主语从句
4. Whose watch was lost is unknown.
5. Why the sun rises in the east is interesting.
从句的位置在整个句子的主语位置
不定式劢名词主语从句中用it作形式主语的结构在it做形式主语时真正的主语也可以是一个句子这个句子也是主语从句的一种主语从句作主语时通常用it作形式主语主语从句放在后面作真正的主语
主语从句精讲
1. That he will succeed is certain . 2. Whether the plan will be carried out is still unknown. 3. Whichever of you comes in first will receive a prize.
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。
主语从句超全讲解加练习
When they will leave is not decided. Where she is from is unknown. How we will paint the house has not been decided.
主语从句的规律： 找出下列句子中的错误，并总结规律 例1.When will he come is not known.
正：When he will come is not known. 规律一、主语从句一律用陈述语序， 即主语在前，谓语在后。
主语从句的规律：
例2. He will not come to the meeting this evening is true. 正：That he will not come to the meeting this evening is true.
3) It +不及物动词+从句 It happened that... 碰巧…… It occurred to me that…我突然想起…
It happened that 刚好)I came into the office *________________( at that time.
*___________________( It occurred to me that 我突然想起)I forget to sent the letter.
Discovery
1.That That we shall be late is certain. 2.Whether Whether they will sell the house is not yet decided.
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。
初中英语主语从句讲解
初中英语主语从句讲解篇一:高中英语语法主语从句讲解及练习主语从句一、概述:在句子中起名词作用的各种从句统称为名词性从句。
根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.主语从句主要有四类:(1) 由连词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。
例如:That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.(2) 用连词 whether 引导的主语从句: 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，只能用whether。
例如:Whether we will hold a party in the open airtomorrow depends on the weather.Whether she is coming or not doesn’t ma tter too much.(3) 用连接代词引导的主语从句1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:What you need is more practice.What I want to know is this.Whatever we do is to serve the people.注:whatever / whoever的功用whatever, whoever在主语从句中不含疑问意义。
它引导主语从句，并在从句中作主语、宾语、表语等。
whatever = anything that; whoever = anyone who。
主语从句超全_2
4) It + be +过去分词+从句 这些动词有advised有人说
/announced据宣布/consider据认为/decided作出决定/found out据查明
/heard有人听说/hoped有人希望/ordered根据命令/pointed out有人指出
/remembered有人记得/told据告知/thought有人认为/turned out结果/well
练一练
【例句呈现】 观察下列例句，指出其中所包含的主语 从句及引导词: 1. What is needed for a long trip is careful
preparation. 该句中主语从句是 _W__h_a_t_i_s_n_e_e_d_e_d_f_o_r_a_ _l_o_n_g_t_r_ip__，引导词为 _w_h_a_t_。
主语从句的结构：句子+谓语 连接词所连接的句子是从句，从句和之后的谓语 构成主句。
主语从句+谓语 主语从句的句序：
it（形主）+that（真主）
充当主语的句子
• 陈述句 （用that引导） • 一般疑问句 （用whether引导） • 特殊疑问句 （用when, where, why, how,
has not been decided. 该句中主语从句是 _W__h_e_t_h_e_r_w__e_w_i_l_l __ _tr_a_v_e_l_a_b_r_o_a_d__o_r_n_o_t_，引导词为 _w_h__et_h_e_r__。
4. Whoever knows the secret mustn’t tell
that… +(should) +do…
这类主语从句中，谓语动词很多为（should )+动词原形
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。
主语从句超全练习试题和答案解析
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.2. It is reported when China has successfully sent Shenzhou VI spaceship into space.3. If he can finish his task on time is of great importance.4. Whether the 2008 Olympic Games will be held in Beijing excited the whole nation.5. After Yang Liwei succeeded in circling the earth, which our astronauts desire to do is walk in space.6. Whatever leaves the room last ought to turn off the lights.7. Why they will solve the serious problem today has not been decided.8. When will win the English competition is still a problem.9. How our spring sports meet will be held or not this week is not known yet.10. It’s strange when he should have gone away without telling us. GRAMMAR主语从句学习指导[寻规找矩] 请观察下列句子，注意主语从句的用法。
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1）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。
That he will win is certain.他肯定会赢。
Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。
注意: 由that 引导的主语从句有时为了使句子结构平衡, 避免“头重脚轻”, 常用it 作形式主语, 而把从句放在后面。
例如:1. That he will refuse this piece of advice is impossible.2.That they should like each other is natural.这样就构成了下面一些常用句型:1) It is + n. +从句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______________(很遗憾)we lost the match._____________(这是事实)he cheated in the exam.2) It is + adj. +从句It’s certain that… 肯定…It is possible that... 很可能……It is unlikely that... 不可能……It is obvious that… 很明显…It is necessary \important \natural\... that…+(should) do________________(很可能)she will come back tomorrow.*_________________(很明显)this measure is effective.3) It +不及物动词+从句It happened that... 碰巧……It occurred to me that…我突然想起…_______________(刚好)I came into the office at that time.*____________________(我突然想起)I forget to sent the letter.4) It + be +过去分词+从句It is said that... 据说……It is known to all that... 众所周知……It is reported that... 据报道……It is believed that..人们相信/认为……It is suggested that + (should）do... 建议……__________________(据报道)20 people were killed in the accident.*_______________(建议)we should eat more vegetable and do more exercise.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。
它们在句子中担任主干成分，并用陈述句形式) What many scientists believe is that the earth is round …Who will take part in the meeting has not been decided.Whoever breaks the law will be punished.Whatever was said here must be kept secret.3)连接副词when，where，how，why等。
Why they suddenly disappeared still remains a mystery.When they will leave is not decided.How we will paint the house has not been decided.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 is natural.正：That they should like each other is natural2)whether引导主语从句，if不可误：If Mary really heard him is really doubtful.正: Whether Mary really heard him is really doubtful.Complete the sentences using what, whether, where, when，who, why, how or that.1.(_____ is needed for success) is your hard work.2.2.(______ they will arrive )has been told to the teacher.3.(_____ we will go tomorrow )hasn’t been decided yet.4.(______ can join in the sport meet) is decided by the teacher.5.(________ it will rain or not) is not clear.Conclusion:主语从句作主语时，谓语动词一般用单数形式。
主语从句的规律：找出下列句子中的错误，并总结规律例1.When will he come is not known..正：When he will come is not known.规律一、主语从句一律用陈述语序，即主语在前，谓语在后。
例2. He will not come to the meeting this evening is true.正：That he will not come to the meeting this evening is true.规律二、连词that 在从句中无实际意义，但不能省略。
例3. If the meeting will be put offhas not been decided yet.正：Whether the meeting will be put offhas not been decided yet.规律三、whether 可以引导主语从句，放在句首，但if不能例4. That whether he will help othersis a fact.正：That he will help others is a fact.规律四、主语从句中的连词不能重叠使用。
例5. When he will come are a puzzle.正：When he will come is a puzzle.规律五、含主语从句的主句谓语动词多用单数第三人称形式。
1. What he needs is that book.2. What he needs are some books.规律六、what 引导的主语从句，可根据表语决定主句动词的单复数形式。
规律七、主语从句为了避免头重脚轻现象,用it 做形式主语，而把从句放在后面。
That the earth turns around the sun is known to all.It is known to all that the earth turns around the sun.找出错误，并给出理由：1.Where shall we spend the holiday isn’t decided.2.You have made a mistake is a fact.3. If the policeman will come is not certain.4. That is certain that we can win.5.It is ordered we should leave at once.6.Where he comes from are a mystery.7.What whether he likes the job is not clear.8.Who he is and where he is from is important.9.What he saw is the stars in the sky.1.___ he made an important speech atthe meeting was true.A. ThatB. WhyC. WhatD. How2. ___we’ll go camping tomorrow depends on the weather .A IfB WhetherC ThatD Where3. It worried her a bit ___ her hair was turning gray.whether B. thatC. whatD. when4.What I say and think ___ none of your business.A. isB. areC. has D have请用恰当的主语从句连词填空: What ,it ,that , whether, whoever1. _____ you don’t like him is none of my business.2. _____ he said at the meeting astonished everybody present3. ________ the 2000 Olympic Games will be held in Beijing is not known yet.4. ________ we’ll go camping tomorrow depends on the weather.5. ________ leaves the room last ought to turn off the lights.用whether\if填空1.The question is ________ the film is interesting.2.________ we shall attend the meeting hasn't been decided yet.Correct or not?If we will have a meeting hasn’t been decided yet.Whether we will………………………….decided yet.Pay attention:放在名词性从句句首，表示“是否”，只能用whether, 不能用if That she wants to know is when the party will be held .What she wants to know is…….Pay attention:此主语从句缺少成分-宾语，故用作成分的what来引导，而不用that He will give up his job surprises all of us.That he will give up………Pay attention:由that引导的主语从句放在句首，that 不能省略。