专门替中国人写的英语语法3-2：过去进行式

　　3-2 过去进行式

　　过去进行式和现在进行式有点类似，只是verb to be要用过去式的。可是有一点不同，过去进行式，很少单独用的，而常和另一句子一齐用。举例来说以下的中文句子：

　　我昨天去看你的时候，你正在打篮球，如译成中文，就是:

　　You were playing basketball when I went to see you yesterday.

　　以下是典型的过去进行式用法

　　I was taking a bath when you called.

　　I was watching TV when you came to see me.

　　They were dancing when the teacher came in.

　　They were singing in the station when the train arrived.

　　Mr. Brown was cleaning his house when his son came home.

　　总而言之，过去进行式通常牵涉到几件事，这两件事同时发生，其中一件事用过去式，另一件事用过去进行式