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重庆大学2003课标版《Grammar》精品PPT课件优质课下载
4、作表语
5、作定语
6、作状语
作主语
To hear your voice is so nice.
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:
1、It is +adj. for/ of sb. to do sth.
不定式做主语 谓语动词用单数
2、It takes sb. some time to do sth.
It takes me three hours to finish the homework every day.
作主语
我每天花去三个小时完成家庭作业。
3、It is + 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.