恩 我先来说一下例句 一。His trousers was been worn out. (这里的 过去分词是做表语,表明一种状态) was been done,而这里的逻辑主语又是他的裤子,所以用被动,是被他穿破的 二。 The bicycle is been riding by my brother now. (这里的 过去分词是表被动,其实就是 be done 的结构) 因为后面的时间状语是now,所以+ing, be done V-ing
have been done 已经被…… (过去完成被动) have been doing 已经做了某事(过去完成主动)