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hasn'arrive 和hadn'arrived有什么区别?

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hasn'arrive 和hadn'arrived有什么区别?
hasn'arrive 和hadn'arrived有什么区别?
hasn'arrive 和hadn'arrived 拼写有误:hasn't arrived 和 hadn't arrived
hasn't arrived 和 hadn't arrived 区别:时态不同
hasn't arrived 现在完成时
hadn't arrived过去完成时
例:
He hasn't arrived in London now.现在他还没到伦敦.
He told me that Tom hadn't arrived there.他说Tom 还没有到.
现在完成时:到现在为止已经发生的动作,强调对现在造成的影响或产生的结果;
过去完成时:到(相对于)过去的某个时间,或某个动作之前已经完成的动作,即“过去的过去”,因此它是一种相对的时态.