swim 动词原形
swam 动词的过去式
swum 是 swim 动过去分词, 如： He has already swum in the swimming pool. 他已经在游泳池游完泳了
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swim与swum老师发了张不规则动词表,swim、swam、swum.swam是swim的过去式,那么swum与swi
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