动作。My brother fell while he was riding his bicycle and hurt himself. 我兄弟骑车时摔了下来，受了伤。When I got to the top of the mountain, the sun was shining. 我到达山顶时，阳光灿烂。2. 时间状语：at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。3. 基本结构：was/were+doing否定形式：was/were + not + doing.一般疑问句：把was或were放于句首。4. 用法1) 过去进行时表示过去某段时间内持续进行的动作或者事情。We were watching TV from seven to nine last night.昨天晚上七点到九点的时候我们在看电视。 2) 过去进行时可以表示在过去某个时间点发生的事情。时间点可以用介词短语、副词或从句来表示。What was she doing at nine o'clock yesterday?昨天晚上九点她在做什么？ (介词短语表示时间点)She was doing her homework then.那个时候她正在写作业。（副词表示时间点）When I saw him he was decorating his room.当我看见他的时候他正在装饰房间。 (when从句表示时间点)3) 在复合句中，如果主要动作和背景动作都是延续的或同时发生的，那么主从句的动词都可用过去进行时。When he was waiting for the bus, he was reading a newspaper.他边等车边看报。 (两个动作都是延续的)He was cleaning his car w