happen的过去分词?

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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