【正文】
grow grew grownthrow threw thrownknow knew known(原形→ “a” → “u”)Begin began begunring rang rungdrink drank drunksing sang sungswim swam swum【ABA型】bee became beee came erun ran run【AB型】(無(wú)過(guò)去分詞)May mightMust mustcan couldshall shouldwill would