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 .
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 .