基数词变序数词口诀基数词变序数词,加上th莫迟疑。八去t,九去e,末尾加上th,,只变个位就可以。Five,twelve俩兄弟,常以f代ve。一二三特殊记,词尾就是t,d,(1-10)的序数词第1first1st1one第2second2nd2two第3third3rd3three第4fourth4th4four第5fifth5th5five第6sixth6th6six第7seventh7th7seven第8eighth8th8eight第9ninth9th9nine第10tenth10th10ten(11-20)een第20twentieth20th20twenty(21-31)的序数词第21twenty-first21st21twenty-one第22twenty-second22nd22twenty-two第23twenty-third23rd23twenty-three第24twenty-fourth24th24twenty-four第25twenty-fifth25th25twenty-five第26twenty-sixth26th26twenty-six第27twenty-seventh27th27twenty-seven第28twenty-eighth28th28twenty-eight第29twenty-ninth29th29twenty-nine第30thirtieth30th30thirty第31thirty-first31st31thirty-one(40-90)的序数词第40fortieth40th40forty第41forty-first41st41forty-one第50fiftieth50th50fifty第51fifty-first51st51fifty-one第60sixtieth60th60sixty第61sixty-first61st61sixty-one第70seventieth70th70seventy第71seventy-first71st71seventy-one第80eightieth80th80eighty第81eighty-first81st81eighty-y-y-one
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