分词作后置定语问题

题目

分词作后置定语问题
如果我想说：有一个人正在经过你,
可以这样说吗?there is a man walking by you
如果是过去时呢?
是there was a man walking by you还是there was a man walked by you?
现在分词和过去分词作后置定语究竟怎么用?

答案

1 There was a man walking by.(比如说,当我抬头看见的时候,）有个人正从我身边走过.
------这句必须含有分词结构
2 There was a man who walked by 有个人从我身边走过了.
-------这句必须用定语从句修饰
（注意,不一样的概念.）