新概念英语第一册语法总结：过去进行时

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        　　奥数网：小编为大家准备了新概念英语第一册语法分析，一起来看看吧~
        　　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+doing
       
        　　When 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.