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To study hard is very important.
It is so nice to hear your voice.
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:
It +is/was + 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 描述主语人的品质特征 （kind / nice / friendly / wise / foolish 等.）
作主语
It is easy _______ her to learn English well.
It is clever ________ you to solve the problem.
of
for
2、It takes/took sb. some time to do sth.
It takes me three hours to finish the homework every day.
我花了一整天时间把屋子打扫干净。
It took me the whole day to clean the house.
作主语
我每天花去三个小时完成家庭作业。
3、It is/was + n. (for sb) to do sth.
It is my pleasure to help you with your English.
作主语
4、用在谚语中
To see is to believe.
To say is easy, but to do is hard.
作主语
1、It is necessary ______us to learn to wait.
(of/for)
2、It was careless ______me to break the cup .