新东方考研语法讲堂42
3、一般过去时与过去进行时一般过去时表示过去发生的事情，往往表示动作已结束；而过去进行时侧重动作正在进行、未完成。试比较：
Mary wrote a letter to her friend last night. 玛丽昨晚给她的朋友写了封信。（信写完了）
Mary was writing a letter to her friend last night. 玛丽昨晚在给她的朋友写信。（信不一定写完）
I read a novel last night. 昨天晚上我看了一本小说。（指已经看完了）
I was reading a novel last night. 昨天晚上我在看小说。（指看了一些）
I often went swimming while I was living in Qingdao. 我住在青岛的时候经常去游泳。
I was running downstairs when I saw her. 我正往楼下跑的时候看见了她。
I ran downstairs and found her gone. 我跑下楼梯，发现她走了。
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