现在分词having been done和过去分词done的区别

having been done 表示该动作发生在主句动作之前已经做完.多用在一些时间比较显性的句子中.
如：Having been cleaned ,the classroom is tidy now.
另外就是having been done不能做定语
（只可做状语.若名词后有逗号,则可用having done做状语,但done可以做定语或状语）.
如：The building having been built is our school
就是一句错句