【主语从句指物】主语从句学习指要

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用来作主语的句子叫做主语从句。如：

(1)when he was born is unknown. 他生于何时还不知道。

(2)what he did last night is being investigated. 他昨天晚上干了些什么正在调查之中。

在主语从句中须注意：

1. 主语从句一般用it作形式主语，放在句首，而将主语从句放到句末。如：

(1)it is possible that he has stolen the car. 很可能他偷了小车。

(2)isn’t it strange that he should not have passed the test?  他测试没有通过，难道不奇怪吗？

2. if引导主语从句时，只能用it作形式主语，放在句首，而将if引导的主语从句放到句末。如：

it is uncertain if he will leave for beijing tomorrow. 明天他是否去北京还不敢肯定。

3. that引导主语从句放在句首时，that不可省，但在句末口语中可省。如：

that he was ill yesterday is known now. 大家都已知道他昨天生了病。

4. 连接代词引导主语从句只能放在句首。如；

(1)who has broken the glass is unknown. 谁打破了玻璃现在还不知道。

(2)what he wants is all here. 他所要的东西都在这里。

5. 主语从句中主句的谓语动词一般用第三人称单数形式，但what引导主语从句的主句谓语动词的形式须根据句子的意思来判断。如(from www.yygrammar.com)：

(1)how he worked it out is still a secret. 他是如何把它做出来的还是一个秘密

(2)what they makes in this factory are tv sets. 他们在工厂里所做的东西就是电视机。
 

主语从句用法详解(例句丰富)

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。1234

how it was done was a mystery. 这是怎样做的是一个谜。

how this happended 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 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。

(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：

whether they would support us was a problem. 他们是否会支持我们还是一个问题。

it was a problem whether they would support us. 他们是否会支持我们还是一个问题。

it remains to be seen whether it will do us harm or good. 它对我们是利是害，还得看看再说。

(3) 对关系代词型what引导的主语从句，通常直接将主语从句放在句首。如：

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。

有时也可将助用形式主语。如：

it is clear enough what he meant. 他是什么意思很清楚。

(4) 如果句子是疑问句，则必须用带形式主语it的结构：1234

is it true that he is the girl’s father? 他是那女孩的父亲，是真的吗？

how is it that you are late again? 你怎么又迟到了？(from www.yygrammar.com)

三、连词that的省略问题

引导主语从句的连词that 有时可省，有时不能省，其原则是：若that引导的主语从句直接位于句首，则that不能省略；若that引导的主语从句位于句末，而在句首使用了形式主语it，则that可以省略：

that you didn’t go to the talk was a pity. 很遗憾你没去听报告。(that不可省)

it was a pity (that) you didn’t go to the talk. 很遗憾你没去听报告。(that可省) 表语从句学习指要
 
     
 
  
一。当一个子句充当句子的表语时，这个子句就叫做表语从句。如：

my idea is that he can teach children english in this school. 我的想法是他能够在这所学校教孩子们英语。

my hope is that he will keep it a secret for ever. 我的希望是它将永远保守秘密。

表语从句中应注意：

1. 连接词that一般不能省略，但当主句中含动词do的某种形式时，that可以省略。如：

what i want to do is (that) i can go up to him and thank him. 我想做的事是走到身边去感谢他。

2. 当句子的主语是：advice, demand, decision, desire, idea, insistence, instruction, order, plan, proposal, recommendation, request, requirement, suggestion, wish等名词时，表语从句须用虚拟语气，即：should +do。如：

my advice is that you should go to apologize to him. 我的建议是你应该去向他道歉。
 

表语从句用法详解(例句丰富)

一、表语从句的引导词

引导表语从句的词有连词that, whether，连接代词和连接副词，关系代词型what，以及as if, as though, because等连词。

1. 由that引导

the fact is that he doesn’t really try. 事实是他没有做真正的努力。

the trouble is that i have lost his address. 麻烦的是我把他的地址丢了。

my suggestion is that we should tell him. 我的建议是我们应该告诉他。

his sole requirement was (is) that the system work. 他唯一的要求是这个制度能起作用。

my idea is that we should start making preparations right now. 我的意见是我们马上就开始做准备工作。

2. 由whether引导

the question is whether the film is worth seeing. 问题是这部电影是否值得看。

【注意】whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句。

3. 由连接代词引导

you are not who i thought you were. 你已不是我过去所想像的人。

the problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。

the question is who (m) we should trust. 问题是我们应当相信谁。

what i want to know is which road we should take. 我想知道的是我们应走哪条路。

4. 由连接副词引导

the problem is how we can find him. 问题是我们如何找到他。

that was when i was fifteen. 这是我15岁时发生的事。

that’s where i first met her. 那就是我第一次遇见她的地方。1234

that’s why he didn’t come. 这就是他没有来的缘故。

that’s why i object to the plan. 这就是我反对这个计划的原因。

that’s where you are wrong. 这就是你不对的地方。

5. 由关系代词型what引导

that’s what i want to stress. 这是我想强调的。

that’s what we are here for. 我们来这里就为了这个。

fame and personal gain is what they’re after. 他们追求的是名利。

he is no longer what he was. 他已经不是以前的他了。

6. 由as if / as though引导

it isn’t as if you were going away for ever. 又不是你离开不回来了。

now it was as though she had known millie for years. 现在好像她认识米莉已有好多年了似的。

it is not as though we were poor. 又不是我们家里穷。

7. 由because引导

it is because i love you too much. 那是因为我太爱你了。

that’s because you can’t appreciate music. 这是因为你不能欣赏音乐。

if i’m a bit sleepy, it’s because i was upall night. 如果我有点困，是因为一夜没睡。

it"s because i passed a slip of paper for john to helen in class. 这是因为我在上课中替约翰传纸条给海伦。

【注意】because 可引导表语从句，但与之同义的since, as, for等也不用于引导表语从句。

二、连词that的省略问题

引导表语从句的that通常不省略，但在口语或非正式文体中有时也可省略：

my idea is (that) we should do it right away. 我的意见是我们应该马上干。

the trouble is (that) he is ill. 糟糕的是他病了。

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