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情感目标:
能运用所掌握的语法,句型和词汇进行交流。
Finish the task
1. 过去完成时的构成:_____+___________
2. 过去完成时表示:
__________________________________
__________________________________
3. 过去完成时常与______________________等引导的时间状语连用。
had
过去分词
when, before, by the time
过去某一时刻或动作之前已经发生或完成的动作。
When I got to school, I realized that I had left my backpack at home.
By the time I got back to school, the bell had rung.
Before I got to the bus stop, the bus had already left.
I was about to go up to my office when I decided to get a coffee first.
As I was waiting in line with the other office workers, I heard a loud sound.
◆ When I got to school, I realized that I had left my backpack at home.
◆ By the time I got back to school, the bell had rung.
◆ Before I got to the bus stop, the bus had already left.
由when, by the time, before等引导时间状语从句时,若描述发生在过去的事,主句常用过去完成时(had + 过去分词)表示动作发生在过去的过去。
◆ I was about to go up to my office
when I decided to get a coffee first.
◆ As I was waiting in line with the
other office workers, I heard a loud
sound.
be about to do, be doing等表示即将或正在做某事时,常用when引导从句表示突然发生的动作。
4a
Make sentences using by the time or before.
1. Tim went into the bathroom. Mary got up.