请把一下主动句改被动句,

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/12 14:54:11

请把一下主动句改被动句,
they cleaned the classroom .
They showed me the room where they lived.
I did my homework.
The teacher is keeping the pupils at school for a revision.
In 1942 the prisoners of war built this bridge.

The classroom was cleaned by them.
I was showed the room where they lived by them.
My homework was done by me.
The pupils are being kept at school for a revision by the teacher.
The bridge was built by the prisioners of war in 1942.

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