什么时候用过去进行时

表示过去在某一时间段或某一段时间内正在发生或进行的动作或状态。其形式为：主语+was/were+V-ing。常与表示过去的时间状语连用，如：last night,last Saturday等；或者与when,while,as引导的过去时间状语连用。

结构组成

1.过去进行时由"主语+was/were+doing"构成

eg:We were having supper when the phone rang.我们正在吃晚饭时电话响了。

2.过去进行时的否定式由"主语+was/were not+doing"构成

eg:This time yesterday Jack was not watching TV.He was repairing his bike.昨天这个时候，杰克不是在看电视，而是在修理自行车。

3.过去进行时的疑问式由"was/were+主语+doing"组成

eg:Were you playing basketball at four yesterday afternoon?昨天下午四点你们在打篮球吗？

例句

1、We were having supper when the phone rang.我们正在吃晚饭时，电话响了｡

2、This time yesterday Jack was not watching TV.昨天这个时候杰克没看电视。

3、He was repairing his bike.他在修理自行车。

4、When/While we were having supper, the light went out.我们正在吃饭时，灯熄灭了。

5、While we were talking,the teacher came in.当我们正在谈话时,老师进来了。