百家乐技巧

新概念英语第一册语法总结:过去完成时
来源: 环球网校 2019-03-22 08:49:02 频道: 新概念

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.

百家乐技巧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

百家乐技巧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

百家乐技巧Yes, she had。 / No, she hadn't。★ 特殊疑问句

What had she done?

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