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1)当我到达学校的时候，我才意识到我把书包忘在家里了。
_______ I got to school, I realized that I
______ ______ my backpack at home.
2)到我返回学校的时候，铃声已经响过了。
_____ _____ _____ I got back to school, the bell ______ _______.
When
had
left
By the time
had rung
根据汉语提示完成句子。
3)我到达公共汽车站之前， 汽车已经离开了。
Before I _____ _____ the bus stop, the
bus ______ _______ _______.
4)我决定先买一杯咖啡，然后再去办公室。
I ______ ______ ______ go up to my office when I decided to get a coffee first.
got to
had
already left
was about to
5)就在我和别的工作人员一起排队等候的时候，听到了一个巨大的声响。
As I ______ _______ ______ ______ with the other office workers, I
______ _____ _____ ______.
was waiting in line
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