the room must be clean还是must be cleaned

问题描述:

the room must be clean还是must be cleaned
Mother said to her daugther“The room ——— before you leave.".

这句话侧重于:让daughter 在离开时打扫房间.
在英语中常用被动语态表示的
如果是 the room must be clean 语法上行得通,但是就没有了一定要让daughter 打扫的意思了
可以解释成:保持干净.
这里老妈子要女儿打扫,那就用must be cleaned 呗