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几道改为被动语态的题!急

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几道改为被动语态的题!急
1.We must water the flowers every day.
2.You can use the dictionary in the exam.
3.Can you mend this radio?
4.We should not allow fifteen-year-old to work at nights.
5.Students must clean their classroom every day.
改为被动语态~谢谢
几道改为被动语态的题!急
1.The flowers must be watered (by us) every day.
2.The dictionary ca be used (by you)in the exam.
3.Can this radio be mended (by you)?
4.Fifteen-year-old shouldn't be allowed to work at nights(by us)
5.The classroom must be cleaned (by the students) everyday