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 is keeping the pupils at school for a revision.2.You must finish the article before Friday.3.They promised Mary a new doll for her birt

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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.Theteacheriskeepingthepupilsatschoolforarevision.2.Youmustfinis

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 is keeping the pupils at school for a revision.2.You must finish the article before Friday.3.They promised Mary a new doll for her birt
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 is keeping the pupils at school for a revision.
2.You must finish the article before Friday.
3.They promised Mary a new doll for her birthday.

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 is keeping the pupils at school for a revision.2.You must finish the article before Friday.3.They promised Mary a new doll for her birt
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.

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.

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+done
2. The article must be finished by you before Friday.
带有情态动词的被动语态：S.+情态...

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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+done
2. 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 done
3. 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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