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任务一：观察
对照图片,找出每个句子中发生时间较早的动作。
Picture 1
( )1. By the time the woman A went out of her house, the bus B had left.
Picture 2
( )2. When the woman A knocked at the door, someone B had come in.
Picture 3
( )3. The woman A realized that she B had left her backpack at home.
任务二：发现
按照动作发生、发展的先后顺序,晚发生的动作用______时态；早发生的动作结构为“______”。这就是我们本单元要重点学习的过去完成时。
对照图片,找出每个句子中发生时间较早的动作。
Picture 1( )1. By the time the woman A went out of her house, the bus B had left.
Picture 2
( )2. When the woman A knocked at the door, someone B had come in.
Picture 3
( )3. The woman A realized that she B had left her backpack at home.
任务二：发现
按照动作发生、发展的先后顺序,晚发生的动作用______时态；早发生的动作结构为“______”。这就是我们本单元要重点学习的过去完成时。
答案
任务一：1. B 2. B 3. B 任务二：一般过去；had＋过去分词
