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。
主语从句
主语从句(subject clauses)1、概述在复合句中起主语作用的从句叫主语从句。
引导主语从句的词有从属连词、、关系代词、连接副词等。
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。
That you don’t like him is none of my business.你不喜欢她不管我的事。
What he said is true. 他说的是真的。
Do you remember how he arrived almost at the end of the party?你记得他几乎是在宴会快结束时才到的吗？This party's really where it's at, man! 啊，这个晚会真棒！Tell us how you fulfilled the heavy task ahead of schedule.告诉我们,你们是怎样提前完成这一艰巨任务的。
We have reason to believe that the fighting on the border may develop into a full-blown w ar. (喻)我们有理由相信边境上的冲突可能发展成一场全面战争。
He said that he would come. 他说他要来。
Whether the football game will be played depends on the weather.足球比赛是否举行将视天气而定。
2、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，它们在从句中不担任成分，不能省略。
(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。
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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Whichever you want is yours. 你要哪个,哪个就是你的。
4. 连接副词引导When we arrive doesn’t matter. 什么时候到没有关系。
How it was done was a mystery. 这是怎样做的是一个谜。
How this happened is not clear to anyone. 这件事怎样发生的，谁也不清楚。
How many people we are to invite is still a question. 邀请多少人还是一个问题。
Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。
5. 关系代词型what引导What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
What’s done is done. 事已成定局。
What he says is not important. 他说的话并不重要。
What I am telling you is mere impressions. 我和你说的都不过是一些印象而已。
What make the river more beautiful are the lotus plants growing in the water. 为河水增色的是水里的荷花。
What you need is a good-sized canvas bag. 你需要的是一个比较大的帆布袋。
What I am afraid of is their taking him to Portugal. 我担心的是他们把他带到葡萄牙去。
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：It’s a pity that he didn’t come. 很遗憾他没来。
It is important that he should know about this. 他必须知道此事。
It’s vital that we be present. 我们出席是至关重要的It was intended that you be the candidate. 大家的意图是让你当候选人。
It is important that this mission not fail. 这项使命不失败至关重要。
It is essential/indispensable that a meeting be convened this week. 本周开一次会非常重要。
It is appropriate that this tax be abolished. 废除这个税是恰当的。
It’s unfair that so many people should lose their jobs. 竟有这么多人失业这是不公平的。
It’s amazing that she should have said nothing about it. 她竟未谈及此事令人惊讶。
It’s unthinkable that they should deny my request. 他们竟然拒绝我的请求，这是不可思议的。
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。
3.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It is a fact that … 事实是…It is an honor that …非常荣幸It is common knowledge that …是常识(2) It + be + 形容词 + that从句It is natural that… 很自然…It is strange that… 奇怪的是…（3）It + be + 动词的过去分词 + that从句It is reported that… 据报道…It has been proved that… 已证实…（4）It + 不及物动词 + that 从句It seems that… 似乎…It happened that… 碰巧…It is not known who he is.It does not matter when he leaves.It is a pity that he can’t attend the party.It’s hard to say how much money is needed.It is known to all that money can’t grow on the tree.Has it been decided where the meeting is to be held?三．注意：1. 但主语从句如果是用连接代词what, whatever, whoever 等引导的，表示的是一个具体的东西或人，这种主语从句不能用引导词it 来替换。
What he said interested me greatly.Whoever is tired may rest.2. 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 suggested (requested, proposed, desired, etc.) that…3. 如果句中做主语的是一个从句，则谓语动词要用单数形式。
How close parents are to their children has a strong influences on the character of the children.How and why he did the experiment is unknown to all.4. If 不可以用来引导主语从句，要用whetherWhether he will write he book is not yet decided.It is not yet decided whether/if he will write the book.4. It 作形式主语和it引导强调句的比较It 作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。
而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。
被强调部分指人是也可用who/whom。
例如：It is a pity that you didn’t go to see the film.It doesn’t interest me whether you succeed or not.It is in the morning that the murder took place.It is John that broke the window.5. 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. (right)That President Jiang will visit our school next week is said. (wrong)(3) It happens…, It occurs… 结构中的主语从句不可提前。
例如：It occurred to him that he failed in the examination. (right)That he failed in the examination occurred to him. (wrong)(4) It doesn’t matter how/whether …结构中的主语从句不可提前。