It 句型

1、It is time+to do sth(到了做某事的时候了）

It is time for me to take a vacation.

2、It be+形容词+of/for sb+to do sth （对某人来说做某事...）

It is kind of you to help me!

3、It takes sb some time to do sth（做某事花了某人多少时间）

It takes me a long time to get close to children.

4、I find/feel/think/believe/..it+形容词+to do sth(我发现/觉得/..做某事是...）

I feel it necessary to learn every day.

5、It is said/reported/suggested/thought/recorded  that...（据说/据报道/提议/认为/据记载...）

It is said that his child is lost.

6、It is/has been+时间段+since...（从...以来，有...）

It is/has been years since we parted in the West Point.

7、I t was+时间段+before..（过了多久才../不久就）

It will(not)be+时间段+before..

It was a long time before people began to use written language.

It will not be long before you regret for what you are doing now.

8、It was ...that/who/whom..(正是...)

It was he who read three books in the library.