过去进行时的用法小结

过去进行时的用法小结
 
1. 表示在过去某一时刻或某一阶段正在发生的动作。如：
I was having a shower at that time. 那时我正冲澡。http://yingyu.chazidian.com
2. 表示某个短暂性动作发生的背景。如：
I was reading the newspaper when the doorbell rang. 我正在看报，突然门铃响了。
3. 过去进行时在语境中的运用。如：
I waved to her but she wasn't looking. 我向她挥手但她没往这边瞧(from http://yingyu.chazidian.com)。
She didn't hear the doorbell. She was listening to the radio. 她没听见门铃响，她在听收音机。
注：与 always, forever, frequently 等副词连用，可表示某种感情的色彩。如：
She was forever complaining. 她老是抱怨。(厌烦)
She was always thinking of others. 她老是想到别人。(赞扬)