小学英语语法专题十：过去进行时课件下载

过去进行时表示过去某一时刻或某一段时间内正在进行或发生的动作。
then, at that time, this time yesterday, at 5 o’clock last night, all night, all the morning, from 7:00 to 9:00 yesterday…
when的用法
1. 状语从句表示短时间的动作，主句常用进行时态或完成时态。
When I came in, he was reading the newspaper.
非延续性动词：come, go, leave, arrive, meet, die等。
when的用法
2. 状语从句表示长时间的动作或状态，主句常用进行时态。
When she was making a call, I was writing a letter.
when的用法
3. 表示突然发生某事，意思是“正在……时突然”，主句常用过去进行时，when从句常用一般过去时。
I was just coming along to see you when I ran into Wilson.