作业帮happen的过去分词?
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happen的过去分词?
happen的过去分词?
happen的过去分词?
过去式：happened 过去分词：happened
happened
过去式和过去分词一样都是happened
happened
还是happen
happened
happend
happened
是一个规则动词，直接加ed 即可
过去分词
happened
happened 直接加
happened