there be sb doing

问题描述:

there be sb doing
there be sb doing一定吗?也就是说如果是这样,there are many people waiting for their trains yesterday,还给几个例子
你们搞错了,我的意思是,如果是过去时,也可以用sb doing?如上例there are many people waiting for their trains yesterday

正确答案:
1 这不是句型
2 waiting for their trains yesterday在句子里做people的定语从句.
明白了吗.解释就是这样的.:)