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.
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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。
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。
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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。