its引导的主语从句

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。

分以下几种情况：

(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 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。

（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：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 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：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？

原则上说，it用作形式主语可以代替下列从句：

1. that从句

It is quite clear that he has read the book.

2. what从句

It doesn’t matter what he says.

It was clear enough what he meant. 他的意思是很明显的。

3. who从句

It hasn’t been decided who will be sent to work there. 还没决定将派谁到那里工作。

4. how从句

It struck her how gentle he was being. 她深深感到他多么温存。

5. when从句

It hasn’t been made clear when the conference is to take place. 会议什么时候召开还没有宣布。

6. where从句

It’s not known where she went. 她到哪里去了没人知道。

It did not matter much where he lived. 他在哪里住都没有关系。

7. why从句

It was clear why he had asked for a conference.

8. whether从句

It makes little difference whether we go or stay.

I chaught the chick its mother hen stand on a chair.

我抓住了那个站在椅子上的妈妈鸡的小鸡。

I love the dog its name is body

我喜欢名字叫body的狗狗。

It is the little dog its mom was found yesterday.

这就是那个昨天找到的狗妈妈的小狗崽。

引导定语从句