.过去进行时讲解与习题1.概念过去进行时是表示过去某一时刻或某一时间内正在进行或发生的动作,可以从两个方面来理解：1 过去某一时刻正在进行或发生的动作。如： They were playing football at ten oclock yesterday morning.My mother was cooking when I got home. I was washing my clothes at this time yesterday. 2 过去某阶段持续进行的动作。 如：I was staying at home last weekend.常与过去某一特定的时间状语连用，如 last night, at that time, at 8:00 yesterday, last Sunday , at this time yesterday, from 7 to 9 last night等。 也有时没有时间状语，要通过上下文的暗示来确定用过去进行时。E.g. The students all worked hard. E
