主语从句
九种英语主语从句
九种英语主语从句英语中的主语从句是一种句子结构，用来作为句子的主语。
它可以替代一个名词，在句子中起主语的作用。
以下是九种常见的英语主语从句：1. 以that引导的主语从句主语从句以that引导，用来表达它所引导的内容是主要的或重要的。
例如：That he arrived late was disappointing.2. 以whether或if引导的主语从句主语从句以whether或if引导，用来表达对某件事情的疑问或是不确定。
例如：3. 以疑问词引导的主语从句主语从句以疑问词引导，用来回答对某事情的问题。
例如：What she said was really surprising.4. 以动词不定式引导的主语从句主语从句以动词不定式引导，用来表达对某件事情的目的或意图。
例如：To finish the project on time is our main goal.5. 以-ing形式引导的主语从句主语从句以-ing形式引导，用来表达对某事情的现实、可能或不可能。
例如：Swimming in the pool is not allowed.6. 以从属连词that引导的主语从句主语从句以从属连词that引导，用来表达对某事情的描述、判断或信念。
例如：That he is a talented musician is well-known.7. 以it作为形式主语引导的主语从句主语从句以it作为形式主语引导，而真实主语通常位于句子后部。
例如：It is important to have a healthy lifestyle.8. 以as if / as though引导的主语从句主语从句以as if或as though引导，用来表达对某事情的比喻、相似或假设。
例如：He acted as if he knew everything.9. 以现在分词引导的主语从句主语从句以现在分词引导，用来表达对某事情的原因、结果或条件。
主语从句
(2) It + be +形容词 +that 从句 It is certain that he will come.
(3) It + be +动词的过去分词 + that 从句 It is suggested that the meeting should be put off till next week. (4) It + 不及物动词+that 从句 It happens that they were absent.
study English hard.
2. 在句型it is required/ suggested / requested/ ordered that… 必须使用虚 拟语气，谓语动词用(should) do。 (1) It is suggested that Tom (should) have a rest. (2) It is required that I (should )be present.
(2) What I want is a cup of tea.
(四) 主语从句的固定句型 It is no wonder that… 难怪… It is siad/ reported/ hoped that… 据说/ 据报道/ 希望是…
(三) 主语从句的主谓一致 1. 主语从句表示抽象概念, 谓语动词用 单数形式。
When we hold the meeting is not
decided yet. 2. 表语是可数名词复数, 谓语动词用复 数; 表语是不可数名词, 谓语用单数。
(1) What I need are five desks.
2. 主语从句在大多数情况下放在句子后 部, 用it作形式主语。 (1) It + be +名词+that 从句 It is a fact that English is being accepted as an international language. It is a pity that you miss such a good journey.
什么是主语从句
什么是主语从句？主语从句是指在一个句子中，作为主语的从句。
从句是由一个连接词引导的子句，它具有主语的功能，并在句子中起到主语的作用。
主语从句通常由连接词“that”、“whether”、“if”、“who”、“what”、“which”等引导。
以下是一些关于主语从句的例子：1. That从句：- "That he is late is not surprising."（他迟到并不令人惊讶。
）这个从句“That he is late”起到整个句子的主语作用。
2. Whether或If从句：- "Whether she will come to the party is still uncertain."（她是否会来参加派对还不确定。
）这个从句“Whether she will come to the party”作为整个句子的主语。
3. Wh-从句：- "Who will win the game is yet to be determined."（谁会赢得比赛还有待确定。
）这个从句“Who will win the game”起到整个句子的主语作用。
4. What从句：- "What she said was very inspiring."（她说的话非常鼓舞人心。
）这个从句“What she said”作为整个句子的主语。
5. Which从句：- "Which book to read is up to you."（读哪本书由你决定。
）这个从句“Which book to read”起到整个句子的主语作用。
主语从句在句子中起到主语的作用，它可以是句子的焦点，也可以用来引入一个话题或提出一个问题。
使用主语从句可以使句子更加丰富多样，并且可以帮助我们表达更复杂的思想。
在使用主语从句时，需要注意以下几点：-主语从句通常位于句子的开头或主语之后。
(完整版)主语从句详解+例句
(完整版)主语从句详解+例句主语从句是复合句中的一个重要成分，由一个从句作为主语，起到句子中主语的作用。
本文将详细介绍主语从句的结构和用法，并提供一些例句进行说明。
1. 主语从句的结构主语从句由引导词和一个从句组成，引导词在句子中充当主语的角色。
常见的引导词有：- that- whether/if- who- whom- which- what- whoever- whatever主语从句的结构可以是以下几种形式：- 陈述句形式：[that + 陈述句]- 一般疑问句形式：[whether/if + 陈述句]- 特殊疑问句形式：[疑问词 + 陈述句]2. 主语从句的用法- 主语从句可以替代主句中的名词或名词短语作为主语，使句子更加简洁明了。
例如：- That he is late is unacceptable.（他迟到是不能接受的。
）- What you said surprised me.（你说的话让我很吃惊。
）- 主语从句常用于强调句型中，强调句型的结构为：[It + 系动词 + 主语从句 + 其他成分]。
例如：- It is important that we take action now.（我们现在采取行动是很重要的。
）- It doesn't matter what they think.（他们怎么想并不重要。
）3. 主语从句的例句- That he didn't show up was disappointing.（他没有露面是令人失望的。
）- Whether she will join us is still unknown.（她是否会加入我们还不知道。
）- Who will be the winner is yet to be determined.（谁将会是胜利者还有待确定。
）- It is surprising that they didn't invite him.（他们没有邀请他是令人惊讶的。
什么是主语从句
s 什么是主语从句？主语从句（Subject Clause）是一个从句，用来作为主句中的主语。
主语从句用来说明主句中的动作或状态的主体或发出者。
主语从句通常由连词that引导，但在口语中通常可以省略。
主语从句与主句的关系是主谓关系，它们共同构成一个完整的句子。
下面是主语从句的一些常见用法：1. 陈述事实或真理：主语从句可以用来陈述一个事实或真理，说明主句中的动作或状态所涉及的内容。
- That he is late again is really frustrating.（主语从句陈述事实）- It is important that we take care of our environment.（主语从句陈述真理）2. 表达观点或看法：主语从句可以用来表达某人的观点、看法或意见，说明主句中的动作或状态所涉及的观点或看法。
- Whether we should go on a vacation is a matter of personal preference.（主语从句表达观点）- It is my belief that honesty is the best policy.（主语从句表达看法）3. 提出问题：主语从句可以用来提出一个问题，说明主句中的动作或状态所涉及的问题。
- How we can improve our communication skills is a topic worth discussing.（主语从句提出问题）- Whether she will attend the meeting is still uncertain.（主语从句提出问题）主语从句与主句之间是一种主谓关系，用来说明主句中的动作或状态的主体或发出者。
在使用主语从句时，我们需要注意连词的选择，通常使用that来引导主语从句。
通过练习和阅读，我们可以提高对主语从句的理解和运用能力，使我们的表达更加准确、流畅和自然。
主语从句
13. __A__ matters most in learning English is enough practice.(2007全国卷Ⅱ)
Eg：Howthis happenedis not clear to anyone.（这事怎样发生的，谁也不清楚）
Eg：whyhe did itremains a mystery.（他为什么做那件事依然是一个谜。）
重点1：有时为了考虑句子平衡，it做形式主语,而将主语从句放在句末（尤其是当谓语较短时）。这分三种情况：
类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.
11. __C___ book you borrow must be returned within a week.
A. What B. Which C. Whichever D. That’s
12. __C__ wants to stay in a hotel has to pay their own way. (浙江2008)
It must beproved that…必须指出……
类似的过去分词还有：known; expected; believed; estimated;thought; hoped; noted; discussed; required; decided; suggested,etc.
Eg：It isthoughtthathe is the best player.(大家都认为他是最好的选手。)
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。
主语从句高考知识点总结
一、主语从句的定义主语从句是一个句子中作主语的从句。
主语从句通常由连接词引导，例如that, whether, who, whom, whose, which, what, 等等。
主语从句在句子中担任主语的角色，也就是说，它起着说明中心事实或判断的作用。
二、主语从句的结构1. 连接词 + 主语从句连接词即引导主语从句的词语，常见的连接词有that, whether, who, whom, whose, which, what等。
例如：What he said is true.（他说的是真的。
）2. 主语从句 + 谓语 + 宾语/表语主语从句通常接在谓语动词之后，谓语之后可以是宾语或表语。
例如：Who will win the game is not yet known.（谁将赢得比赛尚未得知。
）三、主语从句的用法1. 说明中心事实或判断主语从句通常用来说明一个中心事实或判断，表示一个动作或状态。
例如：What he does is none of my business.（他做的事对我无关。
）2. 引出提问有时候主语从句用来引出提问，表示对某一事实或情况的疑问。
例如：What happened to Tom is still a mystery.（汤姆发生了什么事情还是个谜。
）3. 引导宾语从句有时主语从句还可以引导宾语从句。
例如：What he said is not true.（他说的不是真的。
）4. 引导表语从句主语从句也可以引导表语从句。
例如：What I want is a peaceful life.（我想要的是一种和平的生活。
）1. 主语从句中的谓语动词应该根据主语从句的人称和数保持一致。
例如：What he says is true.（他说的是真的。
）2. 主语从句中的连接词不能省略。
例如：I don’t know who will come.（我不知道谁会来。
）3. 主语从句中的连接词有时候可以省略。
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主语从句一、主语从句的概念与类型主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等.例如:That she was chosen made us very happy.她当选了使我们很高兴.What caused the accident is a complete mystery.是什么导致了这次事故还完全是一个谜.Whether she will come or not is still a question.她是否来还是一个问题.Which team will win the match is still unknown.哪个队会赢得这场比赛还不知道.Whoever comes to the party will receive a present.参加聚会的每一个人都将收到一份礼物.When they will start has not been decided yet.他们何时出发还没决定.注意:上述例句中的主语从句都是放在句首,但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:It is a pity that she has made such a mistake.她犯了这样一个错误,真是遗憾.It depends on the climate whether they are going shopping today.他们是否今天去购物还得看天气情况.这样就构成了下面一些常用句型:1)It is + adj. / n. +从句It is a pity/shame that...遗憾的是……It is possible that...很可能……It is unlikely that...不可能……2)It +不及物动词+从句It seems/appears that...似乎……It happened that...碰巧……3)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...据信……;人们相信……It is suggested that...有人建议……It must be pointed out that...必须指出……It has been proved that...已证明…….例如:It is believed that at least a score of buildings were damaged or destroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉.It is suggested that the meeting should be put off.有人建议会议延期召开.It's reported that three people were killed in the accident and five were hurt badly.据报道,事故中三人丧生,五人重伤.It is known to all that Taiwan is an inseparable part of China.众所周知,台湾是中国不可分割的一部分.[巩固练习]1. Does _______ matter if he can't finish the job on time?A. thisB. thatC. heD. it2. It worried her a bit _______ her hair was turning grey.A. whichB. thatC. ifD. for3. _______ is a fact that English is being accepted as an international language.A. ThereB. ThisC. ThatD. It二、学习主语从句应该注意的几个问题1)引导词that与whatwhat既有引导主语从句的作用,同时又在从句中作句子成分(主语、宾语、表语等).这时what 相当于all that/everything that...,常译成"所……的(东西、事情、话等.)";而that只起连接作用,本身无实际意义,在从句中也不担当任何句子成分.但that引导的主语从句放在句首时,不能省略that.例如:What is done can't be undone. (谚语)已成定局,无可挽回.What we can't get seems better than what we have.我们得不到的东西似乎比已得到的要好.That we should work out a plan to deal with the present serious situation is important.我们应该制定一项计划来应付目前严峻的形势,这一点非常重要.That a new teacher will come to teach us geography is true.一位新老师将来教我们地理,这是真的.[巩固练习]4. _______ what they told me really true?A. HasB. IsC. DoesD. Have5. It matters little _______ a man dies, but _______ matters much is _______ he lives.A. how; what; howB. how; it; howC. why; it; whyD. that; what; that6. _______ she couldn't understand was _______ fewer and fewer students showed interest in her lessons.A. What; whyB. That; whatC. What; becauseD. Why; that7. It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.A. thatB. whenC. whatD. how8. _______ fashion differs from country to country may reflect the cultural differences from one aspect.A. WhatB. ThatC. ThisD. Which9. -What made her parents so angry?- _______ she had failed in the examination.A. AsB. BecauseC. SinceD. That2)引导词if和whetherif和whether引导动词后的宾语从句时一般可通用,但介词后的宾语从句、主语从句(放在句首时)、表语从句常由whether引导.例如:Whether she will go home or not is unknown.她是否回家还不得而知.Whether we shall raise ducks or geese remains to be decided.我们是养鸭还是养鹅仍没决定.=It remains to be decided whether/if we shall raise ducks or geese.但我们不能说If we shall raise ducks or geese remains to be decided.[巩固练习]10. _______ we'll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where3)其它引导词连接代词who, which, whom, whose有各自的意义,起连接作用,并在从句中充当语、宾语、表语、定语等;连接副词when,where, why, how等有各自的意义,起连接作用,并在从句中充当状语.[巩固练习]11. -Do you remember _______ he came?-Yes, I do. He came by car.A. howB. whenC. thatD. if12. It was a matter of _______ would take the position.A. whoB. whoseC. whomD. whomever13. -I drove to Zhuhai for the air show last week.-Is that _______ you had a few days off?A. whyB. whenC. whatD. where14. I read about it in some book or other, does it matter _______ it was?A. whereB. whatC. howD. which三、语气在It is necessary / natural / important / strange...+ that-clause这类句型里,that所引导的主语从句中谓语动词用"should +原形",表虚似语气.例如:It is necessary that the problem should be settled at once.这个问题必须马上解决.It's strange that he should have gone away without telling us.他竟然没向我们说一声就走了,真是奇怪.[巩固练习]15. It is necessary that a college student _______ at least a foreign language.A. mastersB. should masterC. masteredD. will master四、以it作形式主语的主语从句与强调句型的区别"It be + adj./n. + that-clause"与强调句型均有It be...that...之类的语言标志,但不同的是:①前者中的that从句是主语从句.若删掉其中的It be和that,则剩余部分不论结构还是语意都不能成为一个句子;但若将后者中的It be和that去掉,则剩余部分的结构和语意仍能构成一个完整的句子.②强调句型译为汉语时可加上"正是……"或"就是……"之类的字眼,而主语从句则不可以.请比较下面两个句子:It is surprising that Mary should have won first place.令人惊奇的是玛莉竟然获得了第一名.It is Mary that has won first place.正是玛莉得了第一名.第一句话中的It是形式主语,that引导的是主语从句.句中的It is和that无法删除,一旦删除句子就不成立.第二句是强调句型,其中的It is和that可以去掉,因为没有It is和that句子仍然很通顺.Key: 1-5 DBDBA 6-10 ACBDB 11-15 AAADB。