as i (walk) down the street,i (meet) Tom讲括号里的单词改为正确形式顺便讲一下as的用法as的用法！

AS I WAS WALKING DOWN THE STREET, I MET TOM

As I am walking down the street,I meet Tom.
AS 的意思是“当。。。。时候”

最好用过去时吧,As I was walking down the street,I met Tom.此处as相当于when,意为“当……时”.