一、過去進(jìn)行時(shí)的概念

表示過去某一時(shí)刻正在進(jìn)行的動(dòng)作或過去某一階段一直進(jìn)行的動(dòng)作。

例：I was doing my homework at 9:00 pm last night.

二、過去進(jìn)行時(shí)的構(gòu)成：

（1）肯定句：主語+was/were+現(xiàn)在分詞+其他

例：He was working when I came in.

（2）否定句：主語+was/were+not+現(xiàn)在分詞+其他

例：There weren't working when we arrived.

（3）疑問句：Was/were+主語+現(xiàn)在分詞+其他？

例：Were they working when you arrived？。