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二、回答更多问题导入语法
1.What was Timmy doing when the earthquake take place?
2.What were people doing while pieces of glass and bricks were falling down?
3.What happened asTimmy was trying to find his way out?
过去进行时主要表示：
? 在过去某一______正在进行的动作
(a）They were eating breakfast at 7:00 am yesterday .
（b）I was writing a letter this time yesterday .
? 在过去某一______一直在进行的动作
（a）From 1983 to 1998 , he was teaching at Yale .
（b）They were building a bridge last winter .
（c） He was watching TV between 8 and 10 last night.
巩固练习
1. What ________ your brother ________ (do) at nine o’clock last night?
2. They ________________ (listen) to music at that time.
3. When I saw him, he ______________ (search) the Internet.
4. They ________________ (discuss) a problem in the meeting room at this time yesterday.
5. ______ Amy __________ (visit) the Science Museum from 9:00 a.m. to 11:00 a.m. yesterday?
连词 while/when/as与过去进行时
? 当两个延续性动词(two long actions)同时进行时，我们可以在两个句子中都用过去进行时，并用 while 连接。
1. People were running wildly while pieces of glass and bricks were falling down.
2. Suzy was making a snowman while Kitty was standing beside her.
当延续性动作进行的同时也有别的动作发生,
用when或while或as 放在延续性动作之前连接两动作,延续性动作(long action)用过去进行时而短暂性动作(short action)用一般过去时.
1. The earthquake started while/when/as I was doing some shopping.
2. I was trying to find my way out when I suddenly heard some noise above me.
巩固练习
1. My wallet dropped on the ground ________________ I was running.
2. ________________ I was falling asleep, there was a loud knock on the door.
3. ________________ he was reading, an earthquake started.