把下面的句子改为被动语态：1.He watered the flower yesterday.2.He will water the flower tomorrow
题目
把下面的句子改为被动语态：1.He watered the flower yesterday.2.He will water the flower tomorrow
3.He is watering the flower now.
4.He has finshed his homework.
答案
1 The flower was watered by him yesterday.
2 The flower will be watered by him tomorrow .
3 The flower is being watered by him now.
4 His homework has been finished by him .
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