it的七种用法

指无生命、动物、植物和在性别不计或不详时指人和婴儿。There is a person knocking at the door. Who can it be?

指心目中的人或上文中提到的人或事物，这那它.

可以代替指示代词this和that

作无人称代词的主语，表时间、天气、距离、温度、环境和情况。It was noisy when I got to the room.

五--表含糊概念，无补语，指从句叙述内容。

I hate it that I've made so many mistakes.

I hate it when you can't discuss things openly.

How is it in the market? 超市情况如何？

六----强调句中使用"It is/was+强调部分 （主语，宾语等）+that/who+其余部分"。如果强调的是特殊疑问句，表示"究竟，到底"等语气时，就用结构："疑问词+is/was it that +句子"，如：Where was it that you met him? What is it that he wants to see? When was it that you saw him?

Why is it that you want to change your idea?

这类强调句也可用作表语或宾语。The question is which book it is that you want to buy.

He found out who it was that saved the drowning boy.

如果强调谓语，谓语动词部分的语气用do，does，did，常译作"的确，千万，真的"

Do be patient! 千万要耐心！He does speak English well。He said he would come and did come.

七、作形式宾语

a) 谓语动词appreciate, dislike, like, hate, love, make (按时到达，成功)等后接由if或when 等引导的宾语从句时，往往在前面加上形式宾语it。 I would appreciate it if you could come to my birthday party.

2、动词have（表明，坚持说）、take（认为，猜想）、hide（隐藏）、publish（公布）、put（表达，写出来）等后接由that引导的宾语从句时，往往在从句的前面加上形式宾语。I take it that you will be leaving Shanghai soon.我认为你不久就离开上海。

We published it that we had finished the project ahead of time. 我宣布我们已经提前完成了这项工程。

3、 动词短语allow for（担保）、count on（期待）、depend on（依靠）、insist on（坚持）、see to（确保）等后接that引导的宾语从句时，必须冠以形式宾语it。 如：I am counting on it that you will come. 我们期待着你的到来。

She'll see to it that he goes ahead。 她确保让他先走。