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选修7《Learning about Language》最新PPT课件优质课下载
构成: to+动词原形，有时to会省略
可以构成不定式短语
没有人称数的和变化
有时态和语态的化变
用法、功能
To see is to believe.
It’s important for us to learn English well.
=To learn English well is important for us.
1.动词不定式作主语
2.单个动词不定式作主语把它当做第三人称单数来对待
3.It+ be + adj. +(for/of sb.) +to do sth.
Your task is to clean the classroom.
My job is to help the patient.
动词不定式作表语。
我的梦想是成为一名老师。
My dream is to become a teacher.
I want to go home.
I found it necessary to talk to him again.
I have no choice but to go.
She could do nothing but ______ .
1.动词不定式作宾语
2.Sb. find it + adj. to do sth.
3.不定式作介词宾语时，如介词前有实义动词do的各种形式则省略to.
cry
The teacher told me to clean the