1)过去进行时表示过去某个时间正在进行的动作,往往表示动作的未完成性;而一般过去时表示在过去某个时间发生的动作或存在的状态,往往表示动作已完成。试比较:
David wrote a letter to his father last night.大卫昨晚给他父亲写了一封信。(信写完了。)
David was writing a letter to his father last night.大卫昨晚正在给他父亲写信。(指信在写的过程中,不一定写完。)
2)过去进行时和一般过去时都可表示过去某段时间内发生的动作或情况,但过去进行时侧重动作持续时间的长度;而一般过去时只说明过去某时发生某事,侧重说明事实。试比较:
It was raining heavily last night.昨晚下着大雨。(侧重说明下雨持续时间长。)
It rained heavily last night.昨天下了大雨。(侧重说明下雨这一事实。)
3)在带有all night,the whole morning等强调时间长度的状语时,用过去进行时更好些。如:
He was working all night last Monday.上周一他整整工作了一个晚上。
4)用when引导的时间状语从句中,当when相当于while时,用一般过去时与过去进行时无差异。如:
I saw John when I walked /was walking to the station.我步行去火车站时看见了约翰。
但当when分句中的谓语动词为一般过去时,其主句用一般过去时或过去进行时,有时会引起时间关系的变化。试比较:
When we arrived,she was making some fresh coffee.我们到时她在调制咖啡。(分句动作发生时,主句动词已在发生。)
When we arrived,she made some fresh coffee.我们到达时她调制了咖啡。(分句动作发生的主句动作之前。)
自卑的人容易患抑郁症吗?
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