were后为什么还可以加being?The windows and doors came from old buildings around the town that were being pulled down.
问题描述:
were后为什么还可以加being?
The windows and doors came from old buildings around the town that were being pulled down.
答
be在这里已经不是作为系动词了 它和后面一个单词组成正在被…
答
这里是过去将来时,WERE用过去式,BEING 用现在进行时表将来
答
就是过去进行时,be doing,这里是被动关系,所以是were being done