had been,has been,has,had 后面加过去分词都是怎么用的?

首先is和was
在现在时态用is
过去事态用was
had been /(pp)
是过去完成事态的用法.
一般用在时间方面,如：
It had been for 3 years since he left
I had finished it yesterday.
has been/(pp) p.s.pp 是过去分词
是一般完成事态
she has finished it now
she had finished it yesterday