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译林2003课标版《Grammar and usage(1)： Overview： infinitive, verb-ing and verb-ed(I)》精品教案优质课下载
作用
主语
宾语
表语
定语
宾补
状语
不定式
动名词
现在分词
过去分词
Task I: Fill in the blanks and point out the function of each to infinitive or verb-ing.
1._______________ is to believe. / _____________ is believing.
2. __________ (type) these pictures is easy for the new machine.
3. _________________________(照顾好这个孩子)is her duty.
4.It is important ______________(consult) a doctor before you take this medicine.
5. It is necessary for people ___________( know )how to use a computer.
6. It is no use _____________(talk) to them.
Concluion 1: Infinitive and the verb-ing used as the subject
动词不定式常指_______、______某一要去完成或要发生的动作，动名词通常表示_________。
当主语是动词不定式时，可用it作形式主语，而把动词不定式结构后置。
常用不定式做主语的句型有：
It’s difficult /important/ necessary (for sb.) _______ …
It’s kind /good / friendly / polite / careless/ rude/ cruel/ clever / foolish/ brave (of sb. )______…
固定句型：It is + no use / no good /fun / a great pleasure / a waste of time…等名词+_____sth.