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请把下列句子变为被动语态：

来源：学生作业帮 编辑：百度作业网作业帮 分类：英语作业 时间：2024/04/28 23:25:20
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：
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.
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