三、句型(语法)
1. 过去进行时的用法:
① 过去某个时间正在发生的动作。
e.g. He was cooking at six last night. 昨天晚上六点,他正在做饭。
② 过去某段时间正在发生的动作。
e.g. I was staying here from March to May last year. 去年从三月到五月,我一直呆在这里。
2. 常与过去进行时连用的时间状语,有:at nine last night, at that time =then/at this time yesterday, when the teacher came in, while he was reading等。