主语从句讲解
主语从句讲解及习题
名词性从句之主语从句一、名词性从句概述：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、主语从句定义：在句中起主语作用的从句称为主语从句。
引导主语从句的连接词主要有：单纯连词(that, whether/ if)、连接代词(what, whatever, who, whoever, whom, whose, which, whichever 等)和连接副词(when, where, why, how, whenever, wherever, however 等)。
1)that引导的主语从句(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.你能得奖看起来不大可能。
That light travels in straight lines is known to all.众所周知，光沿直线传播。
That you don’t like him is none of my business.你不喜欢他不管我的事。
(2)形式主语it替代主语从句位于句首，that引导真正的主语从句会放到句子的后面。
常用的句式主要有如下几种：1.It+系动词+形容词+that从句。
如：It is necessary that … 有必要 .....It is clear that … 很清楚.....It is likely that … 很可能.....It is important that … 重要的是.....类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.例如：It was really astonishing that he refused to talk to you.It is essential that he should be here by the weekend.It seems obvious that we can not go on like this.It is necessary that you (should)master the computer.It is important that a student learn English well.It' s clear that they badly need help.It is likely that a hurricane will arrive soon.知识拓展：在“It is necessary / important/surprising/strange/unthinkable/unbelievable/incredible+that 从句”这类主语从句结构中，从句中谓语动词常用(should) +动词原形”，形式，即要用虚拟语气should 可省略。
主语从句讲解ppt课件
What is even more important is that as the earth cooled down, water began to appear on its surface.
主语
What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acid into the oceans and seas.
Subject Clauses 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.
1
What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.
3
The earth became so violent that it was not clear whether the shape would last or not.
It was not immediately obvious that water was to be fundamental to the development of life.
We don’t know
or not .
Whether he is coming is not known.
What does he want to
tell us?
We don’t know what he wants to tell us.
主语从句讲解及练习
主语从句讲解及练习什么是主语从句？主语从句是由一个从句充当主语的句子结构，它由连接词引导，用来说明主语的内容或者起到引入主题的作用。
主语从句的引导词一般情况下，主语从句由以下连接词引导：- that- whether/if- who/whom- which- what- whatever- whoever- whichever主语从句的用法主语从句在句子中承担主语的角色，可以帮助我们表达某个动作、状态、事件或者事实的主题。
下面是一些常见的用法示例：1. 表达事实或真理：例如：That he is innocent is beyond doubt.（他的无辜是毫无疑问的。
）2. 表达感觉或观点：例如：What he said is very interesting.（他说的话很有趣。
）3. 引导宾语从句：例如：I believe that he will succeed.（我相信他会成功。
）主语从句的位置一般情况下，主语从句位于句首或者句中，具体位置取决于句子的结构和语境。
主语从句的练题请根据下面的句子，填写合适的主语从句：1. __________ you did yesterday surprised everyone.（你昨天做的事让大家都吃惊。
）2. __________ will happen remains unknown.（将会发生什么还不确定。
）3. __________ is important to study hard.（努力研究是很重要的。
）5. __________ we need is more time.（我们所需要的是更多的时间。
）参考答案：1. What2. What3. It4. Whether/if5. What以上是对主语从句的讲解及练习，希望对你的学习有所帮助。
主语从句超全讲解加练习
主语从句的规律 ：
例4. That whether he will help others is 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.
2024/2/17
主语从句的规律 ： 例5. When he will come are a puzzle. 正：When he will come is a puzzle.
2024/2/17
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. Where she is from is unknown. How we will paint the house has not been decided.
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.
2024/2/17
主语从句的规律 ：
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.
2024/2/17
2024/2/17
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. __I_t _is__im__p_o_s_s_i_b_le__th_a_t_h__e_w_i_ll_r_e_f_u_s_e_t_h_i_s_p_i_e_c_e __o_f_a_d_v_i_c_e_._____________________________
(完整word版)主语从句讲解
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.造句:1。
、很明显他是个好人.2。
、他通过了考试让妈妈很高兴。
3、天气是否会转晴还不确定。
(3）（特殊疑问词）连接代词who, whom， whose， what, which, whoever， whatever, whichever 如：__________watch was lost is unknown.__________she did is not yet known. 她干了什么尚不清楚.__________side will win is not clear。
__________comes is welcome。
不论谁来都欢迎。
__________ was said has left us much to think。
这里说的话都应当保密.造句：1. 我们需要的是时间。
2。
谁将成为我们的班长还没有决定。
3。
哪本书更好还不知道。
(4) （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。
主语从句公开课PPT课件
主语从句可以包含丰富的信息， 包括时间、地点、条件、原因等
，使表达更加准确具体。
通过主语从句可以精确地描述某 个事件或情况，避免歧义和误解
。
主语从句还可以用来表达复杂的 观点和态度，使文章更具深度和
说服力。
增加文采和感染力
主语从句可以采用多种句式和表达方 式，如倒装句、强调句等，增加文章 的文采和感染力。
连接代词和连接副词引导的主语从句一般放在句首，谓语动词用单数形式。
连接代词what和which在引导主语从句时，有时可以互换使用，但which更强调选 择范围。
主语从句时态、语态和语气
03
问题
时态问题
主语从句时态与主句时态一致
01
主语从句中的动词时态通常与主句中的动词时态保持一致，表
示同时发生的动作或状态。
当主语从句中的主语是表示数量的短语（如a number of, the majority of等）时，谓 语动词的单复数形式取决于短语所修饰的名词。
主语从句中的主语是并列结构时，谓语动词用复数形式
当主语从句中的主语是由and连接的并列结构时，谓语动词用复数形式。
练习题讲解
选择题
通过选择题的形式， 让学生判断主语从句 中主谓一致问题的正
当主语从句中的主语是复数形式时，谓语动词必须与主语保持一致，也用复数形式。
特殊情况处理方法
主语从句中的主语是不定代词时，谓语动词用单数形式
当主语从句中的主语是不定代词（如something, nothing, anyone等）时，谓语动词 用单数形式。
主语从句中的主语是表示数量的短语时，谓语动词用单数或…
主语从句与形式主语的区分
形式主语it代替真正的主语从句，使句子结构更加平衡。需注意形 式主语与真正主语的区分。
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。
例如：That you will win the medal seems unlikely.That she survived the accident is a miracle.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不能在开头，只能用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.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。
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。
主语从句讲解
主语从句讲解• 主语从句• 一、主语从句的引导词• 主语从句通常由连词that和whether/if、连接代词或连接副词引导。
• 1. that引导• 2. whether引导• 3. 连接代词引导• 4. 连接副词引导• 5. what引导• 1. that引导• That he is still alive is a wonder. • 他还活着，真是奇迹。
• That we shall be late is certain. • 我们要晚了，这是确定无疑的。
• That he should have ignored the working class was natural.• 他忽视工人阶级是很自然的。
• That she is still alive is a consolation.1• 她还活着是使人感到宽慰的。
• That she became an artist may have been due to her father’s influence.• 她成为画家可能是受她父亲的影响。
• That you are co ming to London is the best news I have heard this long time.• 你将来伦敦是好久以来我听到的最好消息。
• That she was chosen made a tremendous stir in her village. • 她被挑选上，在她村子里引起很大轰动。
• Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
• Whether they would support us was a problem. • 他们是否会支持我们还是一个问题。
• 3. 连接代词引导• who will give us a talk is unknown at all . • Whichever (of you) comes in first will receive a prize.无论(你们)谁先到都可以得奖。
2023年高中英语语法精讲之主语从句详细讲解
2023年高中英语语法精讲之主语从句详细讲解主语从句结构及用法在句子中担当主语的从句就叫做主语从句，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。
通常结构为“引导词 + 主语 + 谓语 + 其他成分"。
一. 概念：在句子中担当主语的从句就叫做主语从句，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。
主语从句使用陈述语序，其通常结构为“引导词 + 主语 + 谓语+ 其他成分", 但当连接代词同时充当从句主语时，其结构为“连接代词 + 谓语 + 其他成分”。
二. 引导词：1. that引导eg. That you are coming to London is the best news I have heard this long time.2. whether引导eg. Whether they would come to conference was a question.3. 连接代词引导: who,whom, whose, what, which, whoever, whomever, whichever, whatevereg. Whoever is top from wins the game when two matched players meet.4. 连接副词引导: therefore, besides, otherwise, however, moreover, still, thus, meanwhileeg. How this happended is not clear to anyone.5. 关系代词型what引导三. 形式主语it:1. 对关系代词型what引导的主语从句，可以使用形式主语。
eg. It is clear enough what he meant.2. 如果句子是疑问句，则必须用带形式主语it的结构.eg. Is it true that all of us need to to conference?主语从句有哪几类如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句。
主语从句讲解
一、主语从句的引导词主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。
1. that引导That he is still alive is a wonder. 他还活着，真是奇迹。
That we shall be late is certain. 我们要晚了，这是确定无疑的。
That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。
That she is still alive is a consolation. 她还活着是使人感到宽慰的。
That she became an artist may have been due to her father’s influence. 她成为画家可能是受她父亲的影响。
That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。
That she was chosen made a tremendous stir in her village. 她被挑选上，在她村子里引起很大轰动。
2. whether引导Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。
Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。
主语从句详细讲解
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；1. 从属连词that，whether引导的主语从句。
从属连词that，whether在主语从句中的作用只是引导主语从句，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。
用作it作形式主语的结构：(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…幸运的是It’s (im)possible…（不）可能……It’s unlikely that…不可能It’s strange that…奇怪的是……(2)It is/was +名词+that 从句It’s a pity that…遗憾的是……It’s a fact that…事实是……It’s good news that…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…真是可耻……It’s common knowledge that….. 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…看来……I t 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)其他It doesn’t matter…是无关紧要的It makes no difference…毫无区别……It is of little consequence that…无关紧要[随堂练]It is a pity __________ she has made such a mistake. 她犯这样的错误是令人遗憾的事。
初中主语从句讲解
初中主语从句讲解主语从句是指在一个句子中，作为主语的从句。
研究主语从句可以帮助我们丰富句子结构，使句子表达更准确、更丰满。
以下是初中主语从句的讲解：1. 主语从句的构成主语从句由一个从句充当主语，在句子中承担主语的功能。
从句通常以连词引导，如：that, whether, if, who, which, what, when, where, why等。
2. 主语从句的位置主语从句通常位于句首或句尾。
位于句首时，需用逗号与主句隔开；位于句尾时，与主句之间无需逗号分隔。
示例：- That she is my best friend is known to everyone.（以从句开头）- It is known to everyone that she is my best friend.（以从句结尾）3. 主语从句的时态和语序主语从句的时态和语序要与主句保持一致。
如果主句是现在时，从句通常也是现在时；如果主句是过去时，从句通常也是过去时。
示例：- She said that she is going to the park.（现在时）- She said that she would go to the park.（过去时）4. 引导主语从句的连词常用的引导主语从句的连词有：that, whether, if, who, which, what, when, where, why等。
不同的连词对应不同的情境。
示例：- It is important that we study hard.（that引导，表示重要性）5. 主语从句的变换主语从句可根据需要进行变换，如将陈述句变为疑问句、将陈述句变为感叹句等。
示例：- He knows where the library is. → Where is the library?（变为疑问句）- It's strange that he hasn't arrived yet. → How strange it is that he hasn't arrived yet!（变为感叹句）以上是初中主语从句的讲解。
英语语法讲解之主语从句
英语主语从句主语从句：在复合句中充当主语成分的句子叫做主语从句。
常规主语从句，即句子在复合句中充当一个主语。
主语从句的时态：不受主句的时态影响和限制。
例如：That he finished writing the composition in such a short time surprised us all.What we need is time.It is certain that he will win the match.(1) 引导主语从句连词有that, whether, who, what, whatever 等(2) 连词位于句首不能省略(3) 主语从句大多数情况下视为第三人称单数主语从句引导词：1、由连词that 引导的主语从句。
例如：That you will win the medal seems unlikely.你想获得奖牌看起来是不可能的。
That you are so indifferent bothers me.你如此冷淡使我很烦恼。
That she survived the accident is a miracle.她在事故中幸免于难简直是奇迹。
2、用连接代词或连接副词if, whether 引导的主语从句。
例如：Which of them escaped from the prison is still a mystery. 他们哪一个是从监狱里逃跑的，仍然是个谜。
When they will come hasn’t been made pubic.他们什么时候来还不知道。
Whether she is coming or not doesn’t matter too much.她来不来都无关紧要。
3、用关系代词引导的主语从句。
例如：What you need is more practice.你所需要的是更多的训练。
What I want to know is this. 我想知道的就是这事。
英语的主语从句
主语从句：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，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。
主语从句使用陈述语序，其通常结构为“引导词+ 主语+ 谓语+ 其他成分”；但当连接代词同时充当从句主语时，其结构为“连接代词+ 谓语+ 其他成分”。
一、主语从句的引导词主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。
1. that引导例句：That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。
2. whether引导例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导例句：Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。
4. 连接副词引导例句：How this happended is not clear to anyone. 这件事怎样发生的，谁也不清楚。
5. 关系代词型what引导例句：What struck me was that they have all suffered a lot. 给我很深印象的是他们都受过很多苦。
二、主语从句与形式主语it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。
这分三种情况：(1) 对于以连词that引导的主语从句，通常用形式主语代主语从句：例句：That they should refuse to sign the petition required great courage. 他们拒绝在请愿书上签字这是需要很大勇气的。
(2) 对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
主语从句 讲解
主语从句主语从句：在复合句中作主语的句子。
主语从句的引导词主要有连词that, whether, if连接代词what, who, whom, whose，which, whatever, whoever, whichever等。
连接副词when，where，how, why1. that 引导的主语从句that 引导的主语从句一般位于句首，有时也用it作形式主语而把that从句后置。
that 在从句中不作任何成分，也没有实际意义，只起连接作用。
（从句位于句首时that不可省略，从句位于句末一般不能省略，在口语中偶尔可以省略）Eg: That he will come is certain.That China is a great socialist country is well known.It has been decided (that)they should start the project the next month.他们决定下个月开始这项工程2.whether/if 引导的主语从句whether/if 只起连接作用，有词义，是“是否”的意思。
whether 引导的主语从句可置于句首，这时不能用if 代替；if 引导的主语从句只能用it作形式主语，而把从句放在句末。
Eg: Whether he will be able to come is still a question.Whether the work can be completed on time is doubtful.=It is doubtful whether/if the work can be completed on time 这项工作能否按时完成还不确定。
3.连接代词和连接副词引导的主语从句连接代词和连接副词引导的主语从句要在句中作一定的成分（主语、宾语、表语、定语、状语、补语等），它们有一定的词义。
并且在任何情况下都不能省略。
初中主语从句讲解
主语从句名词性从句包括：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：A.连词：that,whether,if（这三个词都不作从句的成分，同时，that 无含义，而whether和if都表“是否”）B.疑问代词：who,whom,whose,what,whichC.疑问副词：when,where,why,how（一）主语从句：在复合句中充当主语的从句。
1.that引导主语从句that引导主语从句时不同于其他的连词，既无词义也不作成分，只起单纯的连接作用，且通常不可以省。
为了强调that引导的主语从句而置之于句首时，that不可省。
①Thatthedrivercouldnotcontrolhiscarwas obvious.很明显司机不能控制住他的车了②Thatshewaschosenmadeusveryhappy.她被选上让我们很高兴③Thathewillcomeiscertain.他要来已经千真万确了★通常，that引导主语从句时用it做形式主语，把从句置于句尾，此时that有时可省。
例如：①Itwasobviousthatthedrivercouldnotcontrolhiscar.很明显司机不能控制住他②Itmadeusveryhappythatshewaschosen.她被选上让我们很高兴③Itiscertainthathewillcome.他要来已经千真万确了★如果以that从句为主语的句子是疑问句，就只能用先行词it结构。
例如：①Isitcertainthathewillcome?②Isittruethathewouldtaketherisk?▲it做形式主语有以下几种不同的结构：(1)It+be+形容词+that-从句①Itislikelythathewillcome.他可能会来②Itisstrangethatshehasevertrustedhim.她相信他，真令人奇怪(2)It+be+名词+that-从句Itiscommonknowledgethatthewhaleisnotafish.鲸鱼并不是鱼，这是常识It'sapitythatheshouldhave?catchedthetrain.(3)It+be+-ed分词+that从句Itissaidthatheisafamouswriter.据说他是个着名作家Itisreportedthattherewillbeastormthisafternoon.据报道下午将有一场暴风▲在表示建议、要求、命令等意义的被动结构中，that从句中的谓语动词常用(should)do。
主语从句讲解+课件-2025届高三英语上学期一轮复习专项
练习
• 11. _______ they are planning to move to a new city is a possibility. • 12. _______ he passed the exam with flying colors pleased his parents. • 13. _______ you are late for school again is unacceptable. • 14. _______ the economy will recover next year is still uncertain. • 15. _______ she will accept the job offer is uncertain at the moment.
4. 必须用 it 作形式主语的主语从句
• 当主语从句较长或者结构较为复杂时，为了避免句子显得头重脚轻，通常使
用 it 作为形式主语，而将从句放在句子的后半部分。
• - It is clear that he has made a mistake. • - It is uncertain whether they will arrive on time. • - It is important that you should study hard. （你努力学习是很重要的。） • - It is unknown whether he will accept the job offer. （他是否会接受这份工作邀
答案
• 11. That they are planning to move • 12. That he passed the exam • 13. That you are late for school • 14. Whether the economy will recover • 15. Whether she will accept the job offer
202X年中考英语 主语从句知识讲解
千里之行，始于足下。
202X年中考英语主语从句知识讲解主语从句是指在句子中充当主语的句子部分。
主语从句通常以连接词引导，常用的连接词包括关系代词（that, who, whom, whose, which）和连接副词（why, when, where, how）。
以下是主语从句的几个常见用法：1. 用关系代词引导的主语从句：- I don't know who will come to the party.（我不知道谁会来参加派对。
）- That's the dog that barks all night.（那是整夜都在叫的那只狗。
）2. 用连接副词引导的主语从句：- How he passed the exam is still a mystery.（他如何通过考试仍然是个谜。
）- Why she quit her job remains unknown.（她为什么辞去工作还是个未知数。
）3. 当主语从句的谓语动词是不及物动词（如arrive, happen, exist）时，需要使用it作为形式主语，而将主语从句放在句末：- It is unclear whether the meeting will take place.（不清楚会议是否会举行。
）- It doesn't matter what others think of you.（别人对你的看法无关紧要。
）第1页/共2页锲而不舍，金石可镂。
需要注意的是，主语从句与关系从句的区别在于，主语从句是句子的主语，而关系从句是对先行词进行修饰或补充的从句。
初中语法主语从句讲解及
初中语法主语从句讲解及主语从句：即在复杂句中充当主语成分的句子例如"That XXX"，他在很短的时间内写完作文让我们都很惊讶,此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此"That XXX"便是该复合句的主语从句。
主语从句使用陈述语序，其通常结构为“引导词+主语+谓语+其他成分”；但当连接代词同时充当从句主语时，其结构为“连接代词+谓语+其他成分”。
时态：主语从句的时态不受主句时态的影响和限制引导主语从句的连词主要有:从属连词:that、whether（只起连接作用，不充当句子成分）连接代词:who、whoever、whom、whose、what、whatever、which、whichever（既有连接作用，又做从句的主语、宾语、表语或定语）连接副词:when、where、how、XXX、wherever（既有连接作用，又做从句的状语）例句：1.that指导例句：That you are coming to London is the best news I have heard this long time.你将来伦敦是好久以来我听到的最好消息。
2.whether指导例句：Whether they would support us was a problem.他们是否会支持我们还是一个问题。
3.连接代词引导例句：XXX is top from wins the game when two matched players meet.两强相争勇者胜。
4.毗连副词指导例句：How this happended is not clear to anyone.这件事怎样发生的，谁也不清楚。
5.what引导例句：What struck me was that they have all suffered a lot.给我很深印象的是他们都受过很多苦。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
It is said that Mr. Green has arrived in Beijing.
D. It + 不及物动词或短语 + that 从句 ( seem，happen, doesn’t matter ,turn out） 。如： It happened that I was out that day.
5. It worried her a bit ___ her hair was turning gray. A. whether B. that C. what D. when
6.What I say and think ___ none of your business. A. is B. are C. has D have
5) . 用于 It is important / natural / necessary / impossible that...句型中, 主语从句应使用虚拟语气, 用“should + 动词
原形”的形式, should有时可以省略。
6) . 在 It + be + suggested/advised/ordered/requested/ insisted/required 中, that从句的谓语也应该用“should +
It is 4.No matter who leaves the room last ought to turn off the lights. Whoever 5.If the policemen will come is not certain. whether
6.It is say that he was a famous writer. said 7.It is seemed that it is going to rain soon . seems 8.That is fact that she won the first place. It is a fact 9. Who leaves the room last ought to turn off the lights. Whoever 10.It is important that a student learns a foreign language. should learn
It is certain that she will do well in her exam. B. It + be + 名词词组 + that 从句 (an honour, a fact, a pity, etc）如： It’s a pity that we can’t go.
C. It + be + 过去分词 + that 从句 (said, reported, thought, expected, decided, announced, etc。） 如：
We don’t know
主语从句后置!
为了避免主语冗长,句子头重脚轻,经常用 it 作 形式主语,主语从句放在后面作真正的主语. 例:
That we shall be late is certain. -- It’s certain that we shall be late. 1. That the earth is round is known to all.
动词原形”的形式, should有时可以省略。
改错练习
1.Where shall we spend the holiday isn’t decided. we shall 2.You have made a mistake is a fact. That you have
3.That is certain that we can win.
-- It’s known to all that the earth is round.
2. That you missed the chance is a pity. -- It is a pity that you missed the chance.
2. 用it 作形式主语的结构
A. It + be + 形容词 + that 从句 (obvious, true, surprising, good, wonderful, funny, possib le, likely, certain, probable, etc.) 如：
3.___ is known to us all that America is a developed country . A Which B As C What D It
4. It’s known to us all ___ a form of energy .
A. water is C. is water B. that water is D. that water to
It doesn’t matter whether she will come or not.
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 natural. 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：Whether Mary really heard him is really doubtful. It was doubtful if Mary really heard him.
1.连接词：
1）从属连词：that， whether 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. whether意为“是否”， 放在句首句末皆可。 That price will go up is certain. That he will come is certain. Whether we go by train or by boat makes no difference. Whether he’ll come here isn’t clear.
Make sentences :
It’s certain . we’ll be late. Is he coming or not ？
It’s certain that we will be late. ห้องสมุดไป่ตู้hat we’ll be late is certain. We don’t know whether he is coming or not . Whether he is coming is not known. What does he want to We don’t know what he wants to tell us. tell us? What he wants to tell us is not known. We don’t know When will you come back? It doesn’t matter. It doesn’t matter when you will come back. When you will come back doesn’t matter.
“How do you do?” is a greeting.
What she said is not yet known.
That we shall be late is certain.
Whether he will go there is not known . How we can help the twins will be discussed at the meeting.
2)连接代词 who ( whoever) , what
(whatever ), which (whichever), whom, whose .
Which side will win is not clear. Who will write the poem has not been decided yet. Whatever he did is right. Who killed the scientist remains a question. Whom she borrowed money from still puzzled him.
3）主语从句中用陈述语序,后面的谓语动词用第三人称单数
4）“what”引导主语从句时，谓语动词：
常与其后的名词作表语一致 ，且根据句子的语境而定。 eg： 1. What you left are only several old books.
2. What you said is of great importance.
3)连接副词when，where， how， why等。
How this happened is not clear to anyone. When he will be back depends on the weather. When we’ll start tomorrow will be told soon. Where the test will be given is not yet decided.
定义： 用作主语的从句叫主语从句，它是名词 性从句之一。 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。