學位英語語法知識點歸納：過去完成時

過去完成時

用法：在過去的時間里，兩個動作中，發(fā)生在前的哪個動作要用過去完成時。

結(jié)構(gòu)：had+過去分詞

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引導的時間狀語從句放在句首要在句子后面加逗號，如果放在主句后則不用加。

變疑問句將助動詞移到句首

Had she finished her homework?

變否定句在助動詞后面加not

She hadn’t finished her homework.

肯定回答及否定回答

Yes, she had. No, she hadn’t.

特殊疑問句：

What had she done?