have spent 和 had spent 有什么区别、//?

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havespent和hadspent有什么区别、//?havespent和hadspent有什么区别、//?havespent和hadspent有什么区别、//?havespent是现在完成时.现在完

have spent 和 had spent 有什么区别、//?
have spent 和 had spent 有什么区别、//?

have spent 和 had spent 有什么区别、//?
have spent 是现在完成时.现在完成时的概念是截止到现在“已经”.
had spent 是过去完成时.过去完成时的概念是截止到过去某时的先前“已经”.

spent是spend的过去分词
have spent 用于现在完成时,也就是have/has+过去分词的结构
had spent 用于过去完成时,也就是had+过去分词的结构