文档介绍：★基数词变序数词口诀:许家腾4年4班【几十几】21st--twenty-first;22nd--twenty-second;29th--twenty-ninth;31st--thirty-first;100th--hundredth一、二、三特殊记(first,second,third),九去eve要用f替,变完再加th整十基数变序数,ty改为tie,词尾再加th若想表示几十几,只变个位就可以◆-100的序数词【1~12】1st--first;2nd--second;3rd--third;4th--fourth;5th--fifth;6th--sixth;7th--seventh;8th--eighth;9th--ninth;10th--tenth;11th--eleventh;12th--twelfth;【13~19】thirteenth(13th)第十三fourteenth(14th)第十四fifteenth(15th)第十五sixteenth(16th)第十六seventeenth(17th)第十七eighteenth(18th)eenth(19th)第十九【20~90】20th--twentieth;30th--thirtieth;40th--fortieth50th--fiftieth60th--sixtieth70th--seventieth;80th--eightieth;90th--iet基数词变序数词口诀:二、三记特殊(first,second,third),九去eve要用f替,变完再加th13~19,词尾直接th整十基数变序数,ty改为tie,词尾再加th若想表示几十几,-100的序数词:1~121st--first;2nd--second;3rd--third;4th--fourth;5th--fifth;6th--sixth;7th--seventh;8th--eighth;9th--ninth;10th--tenth;11t