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