题目内容：

谁帮我把这些句子改成passive voice阿?
1．The chairman announced the news.
2.l saw the car hit into the post.
3.they had to think over these problems.
4.people mustn'tleave bicycles in the hall.
5.l can't put up with his behavior.

优质解答

1.The news was announced by the chairman.
2.I saw the post was hit by the car.
3.These problems had to be thought over by them.
4.Bicycles are not left by people in the hall.
5.His behavior can't be put up by me.