一、作实词
1. 指代前文提到的事物
Is this your pen?
Yes，it is.
2.指代性别不明的小孩儿或未知的人
My baby is cute.Its the apple in my eyes.
3.指代时间、天气、距离等自然现象
It takes me ten minutes to go home.
二、It作主语的句型
1.It takes sb. some time to do sth.
=sb. takes…to do…
做某事花费某人多长时间
It takes me ten minutes to go home.
=I take ten minutes to go home.
2.Its (about/high)time that…should+动词原形/一般过去时
是该做某事的时候
It is time that we should go to bed.
It is time that we went to bed.
3.It is the + 序数词 +time …+现在完成时
第几次做某事了
It is the first time that I have driven by myself.
4.It was+段时间+before…
距离发生某事多长时间
It was ten years before I left school.
It was not long before they arrived.
5.It is/has been…since…
从……起多长时间了
It has been ten years since we last saw each other.
6.It is like sb. to do sth.
做某事是某人的行为
Its like him to leave the work to others.
三、It作形式主语
1.It be+adj.(for sb.) to do/doing sth.
此处adj.通常要描述客观事件的形容词
It is easy for me to learn English well.
2.It be adj. of sb. to do sth.
此处adj.通常用描述人性格品质的形容词
Its kind of you to help me.
3.It is+n./adj.+从句
从句中动词若表示命令，请求或建议时，要用虚拟语气（should）+动词原形
It is a good idea that we go to the cinema.
It is necessary that we should go out now.
4.It is+过去分词+从句
It is said that he has got married.
5.It+v.+sb.+that…
It surprised me that he gave me the money.
6.It +v.(to sb.)that…=sb./sth. to do
It seemed that he lost his key.=He seemed to lose his key.
四、It作形式宾语
1.主语+v.+it+adj./n.(for/of) sb. to do/doing
I think it difficult for me to finish on time.
2.主语+v.+it+adj.+that+…(should+动词原形)
I think it important that you (should) finish on time.
3.固定搭配中
take it for granted that…
keep it in mind that…
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