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。 1.变疑问句将助动词移到句首 Had she finished her homework? 2.变否定句在助动词后面加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.特殊疑问句： What had she done?
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