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She ran back to school without her keys or backpack.
But by the time she got back to school, the bell had rung.
By the time she walked into class, the teacher had
started teaching already.
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。
She said she had worked in a foreign company for five years before she became an English teacher.
她说在她成为一名英语教师之前已在一家外国公司工作了5年。
注意：
过去完成时也常用于宾语从句中：主句谓语为过去式（said, asked, told等），从句用过去完成时，此时从句中的动作发生在主句的动作之前。
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。