时态详解

过去进行时主要用于下面的情景中：

1.表示在过去某时刻正在进行的动作，

例如：

At this moment yesterday, I was packing for camp.

昨天这个时候，我正在收拾东西去露营。

When I came to see her last time, she was writing an article.

上次我来看她的时候，她正在写一篇文章。

What were you doing at eight last night ?

昨晚八点钟你在做什么?

2.用于故事的开头，交代故事发生的背景情况。

过去进行时所描述的动作是“正在进行”，所以，在这种情景中用“过去进行时”可以给读者一种“动感”，从而能使文章更加生动活泼。例如：

One night, he was typing in his study . Suddenly , a man broke into his house and cut off the electricity … .

一天晚上，他正在书房里打字。突然，一个人闯进屋来，切断了电源……

3.（仅限少数动词）表示在过去的未来时间要发生的动作。

例如：

When National Day was coming near , they began to make a plan for the holiday .

国庆节即将来临的时候，他们开始制订度假计划。

She told me that she was going to Hainan for her holiday.

她告诉我她将去海南度假。

My friend said to me that he was lunching with one of his customers that day .

我朋友对我说，他今天要与他的一位客户一块儿吃午饭。

We left there when it's getting dark.

天快黑的时候，我们离开了那儿。

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