最佳答案：比如说,I ask you to clean the classroom.这个句式的结构就是主，谓，宾，宾补。变成被动语态如下，you are asked to clean the classroom
比如说,I ask you to clean the classroom.
这个句式的结构就是主，谓，宾，宾补。变成被动语态如下，
you are asked to clean the classroom
就是说,还是原来的宾语提前,然后原来的宾补不变,但是,意义变成了主语补足语。
再如，I saw him enter the building.
He was seen to enter the building (by me).
