精选优质文档-倾情为你奉上过去进行时一 概念:过去进行时主要表示过去某个时刻或某一阶段正在进行的动作,常和表示过去的时间状语then,at that time/ moment, yesterday,at nine,last night等连用或者与when, while, as引导的过去时间状语连用。但在不少情况下,没有表示时间的状语,这时需要通过上下文来表示。We were watching TV from seven to nine last night. What was he researching all day last Sunday? 二过去进行时的主要用法是描述一件事发生的背景;一个长动作发生的时候,另一个短动作发生(长动作用过去进行时,短动作用一般过去时)。也可以表示两个动作同时发生,此时均用过去进行时When I saw him he was cleaning his room. While he was waiting for the bus, he was reading a newspaper. He was cle