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

結構：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。

1.變疑問句將助動詞移到句首

Had she finished her homework?

2. 變否定句在助動詞后面加not

She hadn’t finished her homework.

3. 肯定回答及否定回答

Yes, she had. No, she hadn’t.

4.特殊疑問句：

What had she done?