写出过去进行时的标志词和标志句子,他的构成方式是怎样的,至少写出3中标志词及短语。各造两个句子

写出标志词一定要造句

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。常有的标志词有:at that time e.g:When my father came back I was doing my homework.也表示过去的某个时间正在进行的动作。标志词有:at 8:00am yesterday at this time last night 其结构为:助动词"was/werw+doing",它的概念是:表示过去某一时刻正在进行的动作或存在的状态。e.g:My grandpa was taking exercise for his healthat 8:00am yesterday. His family was watching at this time last night.
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