新概念英語第一冊語法總結：過去完成時大綱

過去完成時

用法：在過去的時間裏，兩個動作中，發生在前的哪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後面加逗號，如果放在主句後則不用加。

★ 變疑問句將助動詞移到句首
    Had she finished her homework?

★ 變否定句在助動詞後面加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?