句型转换
It is impossible that a child can lift such a heavy box.
It is impossible  __________  __________  __________  __________  __________ such a heavy box.
It happened that you had known each other be-fore.
You happened __________  __________  __________ each other before.
He said, “I have been told about the news .”
He was said  __________  __________  __________ told about the news.
The teacher made the student stand all the time.
The student was __________  __________  __________ all the time by the teacher.
They saw her enter the room.
She __________  __________  __________ enter the room by them.