it做形式主语的句型

it作形式主语

1.it be +形容词/过去分词+主语从句：

Example : It is important that we should exercise every day.

It was said that our school team won this football game.

2.it be+名词词组(a/an fact/pity/shame/honor/question)+主语从句：

Example:It was a pity that you didn’t come yesterday.

It was a question whether we can arrive there on time.

3.it +不及物动词(happen、appear) +主语从句

Example : It happened that he was her brother.

It appears that they meet at the school library.

3.it be +形容词 +for sb./of sb. to do sth.

Example : It’s very kind of you to help him with his English.

It’s necessary for us to master a foreign language

(小贴士：为什么形容词之后会有用for和of的区别呢?这其实是因为前面形容词的缘故，如果形容词在说sb.“很...”，后面介词就要用of;如果形容词在说to do sth.“很...”，后面介词就要用for )

4.it be+名词词组 +to do sth.

Example :It’ s my pleasure to help you.

5.it be+名词/形容词名词词组 (good/no good/no use/useless/senseless/a waste of) +动名词

Example :It is no good getting close to him.

It is a waste of time talking about such a boring question.

6.it take sb. some time/money to do sth.

Example :It takes him some time to finish his homework.

（责任编辑：付广明）