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.