had not 的缩写形式：hadn't

什么是 “had not” 的缩写？

“had not” 的标准缩写形式是 hadn't。它用于构成过去完成时（Past Perfect Tense）的否定句。

基本结构

肯定句：
Subject + had + past participle

否定句：
Subject + hadn't + past participle

例句

常见错误

注意不要将 hadn't 与 didn't have 混淆。前者用于过去完成时，后者用于一般过去时。

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