问题标题：
【Whyistheclassroomsodirty?一Sorry,sir.It_yesterday.Weforgottodoitdoesn'tcleandidn'tcleanisn'tcleanedwasn'tcleaned】
问题描述：
Whyistheclassroomsodirty?一Sorry,sir.It_yesterday.Weforgottodoit
doesn'tclean
didn'tclean
isn'tcleaned
wasn'tcleaned
万春辉回答：
wasn'tcleaned
昨天没被打扫,所以是被动和过去时
如有问题,欢迎继续追问：）
求采纳～
史大光回答：
能否简单讲一下什么是被动？
万春辉回答：
A对B做了个动作B被（A）⋯⋯样了所以是受体被⋯⋯样了这道题里是：教室被打扫了。
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