happen的过去分词?

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