had been,has been,has,had 后面加过去分词都是怎么用的?【以及和was,is有什么区别?】_英语解答

had been,has been,has,had 后面加过去分词都是怎么用的?
【以及和was,is有什么区别?】

人气：295 ℃　时间：2019-10-26 16:21:54

解答

首先is和was 在现在时态用is过去事态用washad 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...