文档介绍：They were chatting happily at this time yesterday morning.
I was watching TV from 7:00 to 9:00 yesterday evening.
It was raining when I woke up this morning.
Pieces of glass and bricks were falling down while people were running wildly.
过去某一时间点(时刻)
过去某一时间段
过去某一短暂性动作
过去某一延续性动作
1. Pieces of glass and bricks were falling down while people were running wildly.
2. It was raining when I woke up this morning.
过去某一延续性动作(过去进行时)
过去某一延续性动作(过去进行时)
The boy was singing in his room ________ we were walking home through the rain.
过去某一延续性动作(过去进行时)
过去某一短暂性动作(一般过去时)
I was sleeping ______ it started to rain.
I was trying to find my way out _____ I suddenly heard some noise above me.
当…时
当…时
3. The earthquake started while I was doing some shopping.
过去某一短暂性动作(一般过去时)
过去某一延续性动作(过去进行时)
I came back home _________ my mum was cooking supper.
当…时
小结:when引导表示短暂性动作的