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高考英语语法梳理:动词不定式
I.要点
1、不定式的形式。以动词write为例。
式|语态
主动语态
被动语态
一般式
to write
1
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to be written
完成式
to have written
to have been written
进行式
to be writing
2
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完成进行式
to have been writing
2、不定式的句法功能
(1)作主语
To hear from you is nice.
3