现在完成时 是站在“现在时间点”的立场,指过去发生的某个动作对现在造成的影响,或某个动作由过去一直持续到现在.
I have finished my dinner.我已经吃完晚餐了,那现在就不用再吃了.（对现在造成了影响）
过去完成时 则是站在“过去某个时间点”的立场来说明一件事,与现在无关,并非会对现在造成影响.
I had finished my dinner（ yesterday） .我昨天已经吃完晚餐了,那我现在也可能还要要再吃.（对现在不构成任何影响）
i had finished my dinner 和have finished 有神马区别
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