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作主语
It’s impossible for humans to fly
like a bird now.
To study hard is very important.
It is very important to study hard.
不定式作主语时，通常用it作形式主语，
把真正的主语放在后面。
注意:
1、It is +adj. for/ of sb. to do sth.
It +be + adj. +for/of sb. to do sth.
for: adj.多为描述不定式行为的特征 （important/ necessary / interesting 等.）
of: adj. 多为 描述主语的品质特征 （kind / nice / friendly / wise / foolish 等.）
It is easy _______ her to learn English well.
It is clever ________ you to solve the problem.
of
for
2、It takes sb. some time to do sth.
It is my pleasure to help you with your English
It takes me three hours to finish the homework every day.
我每天花去三个小时完成家庭作业。
3、It is + n. (for sb) to do sth.
4、用在谚语中
To see is to believe.
To say is easy, but to do is hard.
1、It is necessary ______us to learn to wait.
(of/for)
2、It was careless ______me to break the cup .
（of/for)
3、It took them 1,000 yuan _________this
table. (buy)