过去正在进行时的标志词（过去进行时标志词）
1、He was marching to the school front door last week/yesterday/2 days ago/last year.was marching ......
1、He was marching to the school front door last week/yesterday/2 days ago/last year.was marching ......
1、过去进行时多用在when引起的从句中，表示某事发生时某个动作正在进行。 2、常有的标志词有：at that time e.g:When my father came back I was d......
