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第1个回答 2016-06-11
过去式表示过去的一件事情,和现在无关。如: Iwrotealetteryesterday.(昨天我写了一封信) 过去完成时表示过去的某个时间之前做了什么,简单说是过去的过去,没有过去就没有过去完成时。如: WhenIreachedthestation,thetrainhadleft.(我到车站时。车子已经走了)left是过去reached的过去。本回答被提问者采纳