将下列句子改为被动语态.We must water the flowers. People cut down a lot

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/05 01:45:21

将下列句子改为被动语态.We must water the flowers. People cut down a lot of trees every year.
He cleaned his bedroom just now.
The teacher won't open the window.
Mary has forgotten the book.

1、The flowers must be watered by us .
2、A lot of trees are cut down by people every year .
3、His bedroom was cleaned by him just now.
4、The window won't be opened by the teacher.
5、The book has been forgotten by Mary .

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