摘要：用法: ①.表示过去某一时刻正在进行或一段时间内一直在进行的动作或情况 a. This time yesterday we were having an important meeting. b. A year ago we were living in Shanghai. ②.过去进行时常与always, continually, frequently等词连用, 表示过去经常发生或反复发生的情况 a. The old man was always losing his way. b. The two brothers were frequently quarrelling. ③.表示过去将要发生的动作, 这一用法仅限于一些表示位置转移的动词, 如: go, come, start, stay, leave等 ④.过去进行时经常与一般过去时配合使用, 过去进行时表示过去的时间背景 a. The teacher was giving us a lesson when Tom walked into the room.

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