新概念英语第一册语法：过去完成时

　　新概念英语第一册语法：过去完成时

　　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。今天我们所要讲过去完成时，下面我们一起来学习吧!

　　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。★ 变疑问句将助动词移到句首

　　Had she finished her homework?★ 变否定句在助动词后面加not

　　She hadn't finished her homework.★ 肯定回答及否定回答

　　Yes, she had. / No, she hadn't.★ 特殊疑问句

　　What had she done?

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