请将下列各句改写成被动语态.

题目

请将下列各句改写成被动语态.
1.People recognize Zheng Wenguang as the father of chinese science fiction.
2.We asked the teacher to explain the sentence again.
3.They are building a new house behind ourschool.
4.They were holding a meeting last night to discuss the problem.
5.The farmer has cut down the tall tree in his garden.
6.They had completed all the work when I arrived.
7.you can divide the books into three griups.

答案

1. Zheng Wenguang is recognized by the people as the father of chinese science fiction.2. The teacher was asked by us to explain the sentence again.3. A new house is being built behind our school.4. A...