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1. What were you doing at eight last night?
I was taking a shower.
2. What was she doing at the time of the rainstorm?
She was doing her homework.
3. What was he doing when the rainstorm came?
He was reading in the library when the rainstorm came.
4. What was Ben doing when it began to rain heavily?
When it began to rain, Ben was helping his mom make dinner.
5. What was Jenny doing while Linda was sleeping?
While Linda was sleeping, Jenny was helping Mary with her homework.
Step 3 过去进行时
1. 基本概念：过去进行时表示在过去某一时刻或一段时间内正在进行的
动作。这一特定的过去时间除有上下文暗示以外, 一般用时
间状语来表示。
2. 结构 was / were ( not ) + 动词-ing
Step 4 过去进行时中的when和while
when和while都可表示“当……的时候”，引导时间状语从句。你知道两
者在过去进行时中的用法有什么不同吗？
请仔细观察下面的例句，然后补全空格中的内容。
① I was walking to school when I saw a cat in a tree.
② When Sally arrived home, her mother was cleaning the house.
主句的动作是持续性的，而从句动作是短暂性的，此时用_______引导
时间状语从句，主句用_____________时态，从句用一般过去时态。
③ While I was sleeping in the bedroom, someone knocked at the door.
④ David fell while he was riding his bike.
主句的动作是短暂性的，从句的动作是持续性的，此时用_________
引导从句，主句用____________时态，从句用过去进行时态。
⑤ While Andy was waiting for the bus, he was reading a newspaper.
⑥ He was cleaning his car while I was cooking.
主句和从句的动作在过去的某时刻或某段时间同时发生，而且动作都