摘要: 过去进行时 1)概念:表示过去某时正在进行的状态或动作. 2)过去进行时的主要用法是描述一件事发生的背景,一个长动作延续的时候.另一个短动作发生. 3) 常用的时间状语有this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while等.例如: 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. It was raining when they left the station. 他们离开车站时.正下着雨. When I got to the top of the mountain, the sun was shining. 我到达山顶时.阳光灿烂.

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