新概念英语第一册语法总结(6)

2011/10/21 13:24:50

  6. 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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