题目内容：

帮忙改几句英语被动语态!
1.HE CLEANS THE CLASSROOM EVERYDAY.
2.They finished theirhomework
3.I can mend his bike
4.She will buy ten books tomorrow
5.We shouldn't allow them to go out with their friends
6.The old man often makes as laugh
7.Lucy is watering the trees
8.We have finished our compositions