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新概念英语第一册语法总结:过去完成时

2011-12-23来源:和谐英语

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?