将英语句子改为被动语态（帮帮忙吧...）

题目

将英语句子改为被动语态（帮帮忙吧...）
1.the pupils asked the teacher to tell a story
2.Children often sing this song
3.people all over the world know the Great Wall
4.John can answer all the questions

答案

1.the teacher was asked to tell a story by the pupils 2.this song is often singed by children3.the Great Wall is known by people all over the world 4.all the questions can be answered by John 主动变被...