请把下列句子变为被动语态：我只知道被动语态的构成是：be＋动词过去分词1.The teacher i

请把下列句子变为被动语态：我只知道被动语态的构成是：be＋动词过去分词1.The teacher i

1.The pupils at school are kept for a revision by the teacher.2.The article must be finished by you before Friday.3.Mary was promised a new doll for her birthday by them.======以下答案可供参考======供参考答案1:The pupils are being kept by the teacher for a revision.The article must be finished before Friday.Mary was promised a new doll for her birthday by them.供参考答案2:1. The pupils are being kept by the teacher at school for a revision. 现在进行时的被动语态：S.+be(is/am/are)+being+done2. The article must be finished by you before Friday. 带有情态动词的被动语态：S.+情态动词+be done3. Mary was promised a new doll by them for her birthday . 一般过去时的被动语态：S.+be(was/were)+done

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