改成被动语态（英语）
问题描述：
改成被动语态（英语）
1 He has to make the bed yesterday.
2 they must have mistaken steven.
请大家帮我改成被动语态的句子
答
为你解答.
1、He had to make the bed yesterday.
The bed had to be made by him yesterday.
2、They must have mistaken steven.
Steven must have been mistaken by them.