主语从句讲解
英语主语从句讲解
The fact is that she never liked him.
That is why he was late for school. 表语从句中不用if , 但可以用as if 引导
He looks as if he was going to cry.
表语从句
同位语从句
同位语从句
The news that our team has won the match is true. His delay is due to the fact that the car went wrong halfway.
宾语从句
I hope that you can pass the exam. He thought it strange that she passed the exam. it 做形式宾语的宾语从句 我们把餐前洗手当成一个规则 我们觉得很奇怪．你竟然喜欢他， We make it a rule that we should wash our hands before meals. We think it strange that you should like him.
1.I hate ____ when people talk with their mouths full A. it B. that C. these D. them 2. I feel ____ strange that he should be so careless. A. / B. it C. that D. how 3. It worried her a bit ____ her hair was turning grey. A．while B. that C．if D．For 4.______ need further discussion whether we will buy the house or not. That B. this C. it D. the thing. 5. I will see to ______ that all the lights are turned off. A. It B. this C. / D. them.
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.
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主语从句的规律 ： 例5. When he will come are a puzzle. 正：When he will come is a puzzle.
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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.
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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.
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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。
语法解析主语从句和宾语从句的区别及用法和句子结构
语法解析主语从句和宾语从句的区别及用法和句子结构主语从句和宾语从句是复合句中的两种常见从句结构，它们在语法上有着明显的区别和不同的用法。
本文将对主语从句和宾语从句的区别以及它们在句子结构中的作用进行具体讲解。
一、主语从句的定义和特点主语从句是指在复合句中充当主语的从句。
主语从句通常由连接词“that”引导，但也可以由连接词“whether/if”引导。
主语从句在句子中起着主语的作用，它对谓语动词进行补充说明或具体阐述主语的内容。
例如：1. That she is talented is obvious.（她很有才华是显而易见的。
）2. Whether he can come to the party remains uncertain.（他能否来参加派对仍然不确定。
）主语从句在句子结构中常常起到引导句子主要内容的作用，使句子更加完整，准确地表达出说话人的意思。
二、宾语从句的定义和特点宾语从句是指在复合句中作为宾语的从句。
宾语从句通常由连接词“that”引导，但也可以由连接词“whether/if”引导。
宾语从句具体说明或补充了动词的宾语部分。
例如：1. He said that he would come tomorrow.（他说他明天会来。
）2. I don't know whether he is telling the truth.（我不知道他是否在说实话。
）宾语从句在句子结构中常常起着补充说明动词宾语的作用，使得句子的意思更加明确和完整。
三、主语从句和宾语从句的区别主语从句和宾语从句在句子结构中的作用和位置有着明显的区别。
1. 位置不同：主语从句通常位于句子的主语部分，作为整个句子的主体内容。
宾语从句则位于句子的谓语动词后面，充当谓语动词的宾语。
2. 引导词不同：主语从句通常由连接词“that”引导，也可以由连接词“whether/if”引导。
宾语从句通常由连接词“that”引导，也可以由连接词“whether/if”引导。
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
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
主语从句讲解主语从句主语从句定义: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。
主语从句是在复合句中充任主语的从句，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。
1.引导主语从句的关联词有三类：(1)从属连词that，whetherThat they were true sisters was clear from the facial resemblance between them.Whether he’ll come here isn’t clear.(2)连接代词who, whom, whose, what, which, whoever, whatever, whichever，What she did is not yet known.How this happened is not clear to anyone.Whoever comes is welcome.(3)连接副词where，when, how, why2.主语从句是在复合句中充任主语的从句，其功同名词一样。
为了避免头重脚轻，常用it作形式主语,而把真正主语放在句子末尾。
How the book will sell depends on its author.That he is the best student in the class is obvious.= It is obvious that he is the best student in the class.注意：主语从句不可位于句首的五种情况(1) if引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。
例如：It is said that President Jingo will visit our school next week.(3) It happens…, It occurs…结构中的主语从句不可提前。
主语从句讲解
1)连接代词 what (whatever ),
who ( whoever) , which (whichever), whom, whose .
连接代词引导主语从句，在句中作主语，宾语，表语， 定语。
Which side will win is not clear. 定语 Who will write the poem has not been decided yet.主语 Whatever he did is right. 宾语 What the city will be still remains a mystery. 表语
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：
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.
Why they suddenly disappeared still remains a mystery.
上海牛津版初中英语主语从句知识点总结讲解
主语从句复习句子成分二、主语的作用主语是谓语讲述的对象，表示所说的“是什么”或“是谁”。
一般由名词、代词、不定代词或相当于名词的单词或短语来充当，也有从句充当的现象。
大多数主语都在句首。
如：讲述“谁”：We work in a big factory.讲述“什么”：The classroom is very big.数词作主语：Three are enough. 三个人就够了不定式作主语：To operate on the blind is one of the ORBIS Doctor’s job.▲ 在“There be …”句型中，主语的位置在中间。
如：There are some bottles of milk in the box.▲ 在个别句型中，主语在整个句子后面，这时前面用it作形式主语。
如：It is very interesting to play the game called “treat or trick”.It took two workers about three months to build the house.从句作主语：What we need is food. 我们最需要的是食物.三. 主语从句在复合句中起主语作用的从句叫主语从句。
引导主语从句的关联词有从属连词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。
在上海高考中的主语从句，新题型中注重连接词的选用，翻译中注重考查句子结构。
知识梳理第一部分：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。
（1）That he finished writing the composition in such a short time surprised us all.（2）Whether we will go for an outing tomorrow remains unknown.（3）Who will be our monitor hasn't been decided yet.（4）Whom we must study for is a question of great importance.（5）What caused the accident remains unknown.（6）Whatever you did is right.（7）Who the watch belongs to was lost is unknown.（8）What we need is time.（9）What we need are good doctors.小结:（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三单,但也有例外,如例9专项练习A. What... whyB. That. . . whatC. What.. . becauseD. Why.. .thatA. whileB. thatC. ifD. for3.It is pretty well understood controls the flow of carbon dioxide in and out the atmosphere today.A. thatB. whenC. whatD. how4. ______ man first made use of electricity is not exactly known.A. WhenB. IfC. ThatD. What5. ______ we will have a meeting hasn't been decided yet.A. IfB. ThatC. WhatD.WhetherA. That... thatB. What... whatC. Whatever.. . thatD. As... as7. ______ leaves last turns off the light.A. WhoB. WhoeverC. No matter whoD.Whomever8. ______ wins the prize may get the car.A. WhoB. WhomC. WhomeverD.Whoever9. ______ a pity that I didn't see you last week.A. That'sB. What'sC. It'sD. There's10. ________ s he will come is certain.A. ThatB. WhatC. /D.WhetherA. If... doB. That... doC. That... doesD. If...does12. _______ h as questions can ask the teacher after class.A. WhoB. WhoeverC. AnybodyD. One13. is one of the most useful and fascinating divisions of human knowledge is widely accepted.A. Where chemistryB. That chemistryC. What chemistryD. ChemistryA. whyB. thatC. whetherD. how15.Does _________ matter if he can't finish the job on time?A. thisB. thatC. heD. itA. That... producingB. That... produceC. This... producingD. This... produces17.After Yang Liwei succeeded in circling the earth, our astronauts desire to do is to walk in space.A. whereB. whatC. thatD. how18.It is doubtful_________he knows it or not.A. thatB. ifC. whatD.whether19. _______ caused the accident is still a complete mystery.A. WhatB. ThatC. HowD. Where20. ______ they will hold a sports meeting next week hasn't been decided yet.A. IfB. ThatC. WhatD.Whether21.It doesn't matter_______ will take charge of the work.A. whoB. whoeverC. whomD.whomever22.______ is worth doing at all is worth doing well.A. ThatB. WhichC. WhateverD. ItA. What... isB. Whether. .. areC. That... isD. If... is24. _______ some mammals came to live in the sea is not known.A. ThatB. SinceC. AlthoughD. HowA. That... whether... /B. What... if... thatC. That... if... whatD. What. .. whether... /Keys: 1-5 ABCAD 6-10 BBDCA 11-15 CBBBD 16-20 BBDAD 21-25 ACCDD第二部分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。
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
主语从句讲解《主语从句讲解》篇一：主语从句讲解嘿，同学们，今天咱们来唠唠主语从句这个事儿。
啥是主语从句呢？简单来说，就是在一个句子里，本来该是一个名词或者代词啥的作主语，结果呢，是一个句子来充当主语了，这个句子就叫主语从句。
比如说，“What he said is very important.”这里的“What he said”就是主语从句，你看啊，正常情况下我们可能会说“He said something important.”但是这里把他说的内容当作一个整体，这个整体作为句子的主语，就形成了主语从句。
我记得我刚学主语从句的时候，那叫一个懵啊，就像走进了一个迷宫似的。
我当时就想，这好好的为啥要让一个句子当主语呢？这不是没事找事嘛。
但是后来慢慢就发现它的妙处了。
你想啊，如果我们想要表达一些比较复杂的想法的时候，主语从句就特别有用。
就像“Whether we can succeed depends on our efforts.”这里“Whether we can succeed”这个主语从句就把我们能不能成功这个事儿当成了一个整体，来说明它取决于我们的努力。
这就好比把很多个小零件组装成了一个大的模块，然后把这个大模块放到句子里特定的位置。
再举个例子，“That he is always late makes his teacher angry.”这个句子里，“That he is always late”就是主语从句，它陈述了一个事实，就是他总是迟到这个事儿，这个事儿让他的老师很生气。
这就像一个导火索，这个主语从句就是那个导火索，一旦它发生了（他总是迟到），就会引发后面的结果（老师生气）。
有时候主语从句也会让句子看起来很高级哦。
就像你写作文的时候，你用个主语从句，阅卷老师可能就会眼前一亮。
比如说“Who will be the winner remains a my stery.”这个句子多酷啊，比你直接说“We don't know who will be the winner.”要高大上不少吧。
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。
主语从句的讲解和运用
3 Why my comfortable tatami
was replaced by a “kang” was unknown.
4 Even worse, whether the “kang”
chemistry in the English class last time.
强调句 和形式主语从句区别
I slept on the “kang”.
It was I that/ who slept on the “kang”.
It was the “kang” that I slept on.
could work remained unknown.
5 Whatever the life did to me was a
gift for me.
归纳表格
主语从句
that whether(无if)
DIY！
是成否分作 去子整掉能，否句完
有无 意义
能 否 省 略
疑问代词(who what whose, whom
which)+ever，主宾 表定
不能
疑问副词（how, why when where)
状语
Practice 幸运儿
1. ______he said at the meeting surprised us greatly. 2. ______we’ll go camping tomorrow depends on the weather. 3. _____he doesn’t like them is very clear. 答案：What; Whether; Whether/Why
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。
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It has been proved that…
已证实…
It is said that…
据说…
It is decided that…
决定…
It is believed that…
相信…
It is known that…
众所周知…
It is said that President Obama will visit our
It was an honour that I was invited to the party.
（2）It + be + 形容词 +（主语）从句
It is natural that… It is strange that…
很自然… 奇怪的是…
It was strange that he should fail in the exam.
❖ 5) _W__h_a_t ____ we need is more time.
❖ 6) _W__h_e_th_e_r__ we can arrive at the airport before 8 o’clock is still a question.
Thank you very much.
主语从句
郁南县连滩中学 李梅芳
主语从句定义： 主语从句是在复合句中充当主语的从句， 其功能同名词一样。
引导主语从句的关联词有： （1）从属连词that, 不能省略。 That she left him made him heart-broken. （2）从属连词whether Whether he’ll take part in the play is clear. （3）连接代who,whom,whose,what,which,whoever, whatever,whichever,连接副词when,where,how,why What she did is not yet known. Whoever comes is welcome. How she can keep healthy is a secret.
（3）It+不及物动词+（主语）从句
It seems that… It happened that… It appeared that…
似乎… 碰巧… 似乎…
It seems that he has seen the film.
（4）It＋过去分词＋从句
It is reported that…
据报道…
❖ 3) _W__h_e_n____ the building of the car factory will be started hasn’t been decided yet.
❖ 4) _W_h_i_c_h____ team will win the match is still unknown.
school.
❖ 填空练习：
❖ 1) _W__h_e_re____ the meeting will be held next week hasn’t been decided yet.
❖ 2) _W__h_e_n____ the plan will be carried out is still unknown.
what 与that 在引导主语从句时的区别 What在引导主语从句在从句中充当句子成分，如主语、 宾语、表语，而that 则不然。 What she said yesterday is right. That he is still alive is consolation.
it 做形式主语 It做形式主语代替主语从句，主要是为了平衡 句子结构，主语从句的连接词没有变化 。
在主语从句中，谓语动词一般用单数。 Where we will get together has not been decided. 但谓语动词用单数还是复数，不可一概而论，而要视句 子的意义而定。 What I need is money. What I need are books.
如果由and连接两个或两个以上的主语从句作主语时， 谓语动词用复数；有两个或多个连接词 引导一个主语 从句时，谓语动词用单数。 When they will start and where they will go have not been decided yet. When and where the meeting will be held has not been decided.
It is still a mystery what caused the accident.
用it作形式主语的句型
（1）It + be + 名ct that…
事实是…
It is an honour that…
…非常荣幸
It is common knowledge that… …是常识