动词过去式规则变化 1 直接加ed eg：work worked worked 2 以不发音的e结尾的,+d eg：live lived lived 3 以辅音字母+y结尾的,变y为i加ed eg：study stuied stuied 4 以重读闭音节结尾的,双写最后的辅音字母+ed eg：...