专题
过去完成时
「过去的过去」
规则要点
had + 过去分词。
说明
表示在过去某一时刻之前就已经完成的动作，常出现在叙事或宾语从句中。
When I got to the station, the train had left.（到站之前车已经开走）
示例
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He realized he had forgotten his wallet.
他发现自己早就忘了带钱包。
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By 1999, she had published three novels.
到 1999 年她已经出版了三部小说。