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at 8 last night, at that time，at that moment,
at this time（yesterday ...) 等
e.g. What were you doing at 10 yesterday morning?
I was writing a letter to my father at that moment.
b: 表示过去某段时间内正进行的动作。常见的时
间状语有:
all night，from7:00 to 9:00am (yesterday),
at the time of...等。
e.g. We were reading from7:00 to 9:00 yesterday.
They were waiting for you all afternoon.
Past Progressive Tense(过去进行时)
1. 概念:
2. 构成:
3. 标志词:
表示过去某一时刻或某段时间内正进行的动作。
was/were + v-ing
??How to add -ing ?
1） 一般动词在词尾加-ing, 如go--going。
2) 以不发音字母e结尾的动词, 去掉e, 再加-ing。
come--comingmake--making?
3) 以重读闭音节结尾的动词, 如果末尾以一个
辅音字母结尾, 应先双写这个字母, 再加ing。
如: get--getting?swim--swimming?
4) 以字母ie结尾的动词, 变ie为y, 再加ing。
die → dying lie →lying
直
去
双
改
lie