did when doing
问题描述：
did when doing
如果while 前后都加ing的话 那么when 是前加ing 还是后加ing?
比如说I was talking on the phone when a friend went into a shop
还是I talked on the phone when a friend was going into a shop
答
when 的用法有很多,最常用的是be doing when 后加do,此时译为当什么时候在做什么事,强调的是when前面的动词.而当when译为刚一.就.的时候有三种用法,分别是：1,had done when加从句 2,was doing when加从句 3,be abou...