广州酷学酷玩夏令营：

       过去进行时还可以用在状语从句中：
       he met the bride while he was studying in california. 他是在加州上学时遇到新娘的。
       he lost his purse when he was strolling across a meadow. 他在草地上散步时把钱包丢了。
       i got to know her when i was working in a pharmacy. 我在药房工作时认识了她。
while the water was heating, i began cooking. 烧水时我开始做饭。
       过去进行时可以用来描绘一幅景象，作为描绘的开始：
       a fire was burning and a cat was sleeping in front of it. a girl was playing the piano and singing softly to herself. then there was a knock at the door. 炉火烧着，一只猫睡在炉火前。一个女孩在弹钢琴，轻声对自己唱着，这时有人敲门。
       she was sitting at the window, watching the evening invade the avenue. suddenly she heard someone calling her from downstairs, and she recognized the voice. she stood up quickly. 她坐在窗前，看着暮色渐渐笼罩大街。突然她听到楼下有人叫她。她听出了这声音，迅速站了起来。
在故事中间也可用过去进行时来描绘一幅景象：
       at last we got to the top of the mountain. white snow covered everything. people were sitting in groups of three and four. some were lying on their backs. when they saw us, they were very happy and shouted: “we thought you had lost your way!” 最后我们爬上了山顶。白雪覆盖着一切，人们三五成群地坐着，有的人仰面躺着。他们看到我们时非常高兴，高声叫到：“我们还以为你们迷路了！”
在小说中我们常可以看到这样的段落。

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