一般过去时与过去进行时的区别：
一般过去时：强调过去某一时间开始或完成的动作.
过去进行时：强调过去某一时间正在进行的动作.
试区别下面两句：
We were building a reservoir last winter.
去年冬天我们在修建一座水库.（可能尚未建成）
We built a reservoir last winter.
去年冬天我们修建了一座水库.（已经建成）
was doing 与did 之间的区别.
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