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mom,i haven't finished eating breakfast yet.i'll brush my te

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mom,i haven't finished eating breakfast yet.i'll brush my teeth when i'm done.最后为什么是被动,跪
我看翻译上解释说是,我吃完了就刷牙,但是不是说“i've done ”就可以了吗?
mom,i haven't finished eating breakfast yet.i'll brush my te
1、基础知识:过去分词可以当形容词使用,在句中充当表语、定语、状语等成分.
2、句子分析:
I'll brush my teeth when i'm done.
I’m done.=I’ve done.=I‘m finished.=I’ve finished.
这里是过去分词作形容词充当表语,用系表结构来表示处于做完的状态,不是被动语态.
3、举一反三:
The glass is broken.(系表结构,表示处于破的状态)
The glass was broken by someone last night.(被动语态,表示被人打破的.)