精选优质文档-倾情为你奉上Unit 5 What were you doing when the rainstorm came单元语法聚焦五过去进行时1构成：主语was/were动词的现在分词其他2用法：过去进行时主要表示过去某一时间或在某一个时间段内正在进行的动作。如： I was doing my homework at this time yesterday.昨天这个时候我正在做作业。3常用的时间状语有then, the whole morning, at this time yesterday, from nine to ten last evening 等或when/while引导的时间状语从句。4when和while的区别：(1)引导时间状语从句时，while 连接的是时间段或与延续性动词连用，而when既可以连接时间点，又可以连接时间段；when既可以与延续性动词连用，又可以与短暂性动词连用。如：While we were talking, the teacher came in.当我们正在交
