新概念英语第一册语法：过去进行时

　　新概念英语第一册语法：过去进行时

　　英语中的时态一共有八种，它们是：一般现在时、现在进行时、一般过去时、现在完成时、一般将来时、过去进行时、过去完成时、过去将来时。今天我们要讲过去进行时，下面我们一起来学习吧!

　　过去进行时——表示过去正在进行的动作，经常用在when, while, as引导的状语从句中。

　　结构：was/were+doingWhen my husband was going into the dining room this morning, he dropped some coins on the floor.Their father was watching TV while they were having dinner.

　　★变疑问句将be动词移到句首

　　Was their father watching TV while they were having dinner.

　　★变否定句在be动词后面加 not

　　Their father was not watching TV while they were having dinner.

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