It is two weeks since I have seen him.( have seen-- saw)谁能够帮我讲出一个_英语解答

It is two weeks since I have seen him.( have seen-- saw)
谁能够帮我讲出一个所以然?
麻烦题目看清啊——就是把HAVE SEEN改成了SAW 这是为什么？什么理由？

人气：421 ℃　时间：2020-04-14 03:23:30

解答

since引导的状语从句必用一般过去时态.例如,Two years has been since I came to Shanghai.