happen，hate，have，hear和help的单三，现代分词，过去式和过去分词。谢谢
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happne: happens, happening, happened, happened
hate: hates, hating, hated, hated
have: has, having, had, had
hear: hears, hearing, heard, heard
help: helps, helping, helped, helped
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hate: hates, hating, hated, hated
have: has, having, had, had
hear: hears, hearing, heard, heard
help: helps, helping, helped, helped
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