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1.It rains heavily.
2. It is 20 kilometers from Granddad's house to James’.
3. It is November 11, 2005.
4. It is 9 o’clock at night.
5. It'll be lovely in the garden tonight．
6. It is bad to smoke.
7. It was his carelessness that caused the accident.
Ⅱ it作形式主语和形式宾语的用法
①It + be +adj.（for sb.）to do sth.
此处adj. 通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，wrong，important，unimportant，polite，impolite，clear，certain，proper，fit，useful，useless，dangerous…
e.g
It is impirtant（for us）to learn English well.
②It + be +adj. (of sb) to do sth.
此处adj. 通常为描述人的形容词：kind，unkind，nice，rude，careful，careless，silly，foolish，stupid，clever，wise，crazy.
e.g
It's kind of you to help me with the problem
③It + be +n+ to do sth.
常见名词为 honor ,pleasure, fun等。
e .g It is a pleasure to work with you.
2. it替代作主语的动名词的常见句型
It's no good/use doing
It's useless doing
It’s a waste of time doing
e .g It's no use crying over spilt milk.
3. it作形式主语替代主语从句
① It be adj. +clause
It is obvious( clear，true，possible, certain …) that ...
该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为“清楚（显然的……）”
是主语从句最常见的一种结构。例如：
It is very obvious that she is upset.