had been done与had done是什么结构 他们的用法是什么

had been done 是过去完成被动时态
had done 是过去完成时态,表示过去某时间前已经发生的动作或情况,这个过去的时间可以用by,before等介词短语或一个时间状语从句来表示；或者表示一个动作在另一个过去动作之前已经完成.
we had just had our breakfast when peter came in
i had done sth=sth had been done by me
一般这两个时态有固定的时间状语做搭配的
关键还是要看上下文进行选择的