John has finished his homework .we must do something to prot

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John has finished his homework .we must do something to protect the environment.被动语态

John has finished his homework .
John's homework has been finished by him.
we must do something to protect the environment.
Something must be done to protect the environment.
再问：被动语态要怎么去理解啊
再答：先说主动语态，就是谁做了什么那么相对的，被动语态，就是什么被谁做了
再问：那有什么格式的么？
再答：动词的形式分三种现在时，过去时，过去分词被动语态中，要用动词的过去分词的形式

we should do something _______just talking about how to prot John went to bed after he finished his homework.还能怎么转换 — Has Sam finished his homework today? Has he finished his homework怎么回答 18.Has Jack finished his homework yet? The has finished his homework yet改错 Jack has just finished his homework? 1、Has Sam finished his homework today — Has Sam finished his homework today? -Has Sam finished his homework today, Anne? Has Jack finished his homework yet? He has finished his homework.被动语态