以辅音字母加Y结尾的单词变过去式study-----studied
try------tried
copy------copied
justufy----justified
cry----cried
carry-----carried
embody-----embodied
tidy-tidied
empty----emptied
hurry----hurried spy----spied marry-married
worry-worried
simplify-simplified
双写词尾辅音字母加ed
stop-stopped drop-dropped fit-fitted travel-travelled beg-begged rob-robbed
pat-patted drip-dripped plan-planned hug-hugged
特殊词的过去式
eat-ate write-wrote sing-sang ride-rode swim-swam hurt-hurt wear-wore put-put
come-came run-ran
以辅音字母加y结尾的单词变比较级happy----happier
easy----easier
buzy----buzier
lazy----lazier crazy----crazier
dirty----dirtier