新概念英语第一册语法知识点总结（六）

英语自学网

　　新概念英语第一册语法知识点之过去完成时：
        　　用法：在过去的时间里，两个动作中，发生在前的哪个动作要用过去完成时。
        　　结构：had+过去分词
        　　After she had finished her homework, she went shopping.
        　　They had sold the car before I asked the price.
        　　The train had left before I arrived at the station.
        　　After/before引导的时间状语从句放在句首要在句子后面加逗号，如果放在主句后则不用加。
        　　1、 变疑问句将助动词移到句首
        　　Had she finished her homework?
        　　2、变否定句在助动词后面加not
        　　She hadn’t finished her homework.
        　　3、 肯定回答及否定回答
        　　Yes, she had. No, she hadn’t.
        　　4、 特殊疑问句：
        　　What had she done?
        （兼职编辑:杨帆）