谁来帮我把这几个英语短句改为被动语态
问题描述：
谁来帮我把这几个英语短句改为被动语态
改为被动语态
1.he is cleaning the classroom.
2.they have finished their homework.
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 us laugh.
答
1.The classroom is being cleaned by him.2.The homework were finished by them.3.His bike can be mended by me.4.Ten books will be bought by her tomorrow.5.They shouldn't be allowed to go out with their ...