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1、基数词变序数词,基数词(表示个数的词),1-one 一个 2-two 两个 3-three 三个 4-four 四个 5-five 五个 9-nine 九个 12-twelve 十二个 20-twenty 二十个 21-twenty-one 二十一个 30-thirty 三十个,first (1st)第一,ninth (9th)第九,second (2nd)第二,fourth (4th)第四,third (3rd)第三,thirtieth (30th)第三十,twenty-first (21st)第二十一,twentieth (20th)第二十,fifth (5th)第五,twelfth (1
2、2th)第十二,序数词(表示顺序的词),基数词变序数词的口诀,基变序，有规律 词尾加上th,four,th,一/二/三/，全变体,one,first,two,second,three,third,八去t,九去e,eight,th,nine,th,Ve要用f替,five,f,th,以y结尾变ie,twenty,ie,th,遇到几十几，只变个位就可以,thirty-one,first,基数词变序数词的口诀,基变序，有规律,词尾加上th，(fourth,sixth),一、二、三，全变体(first, second, third),八去 t，九去 e (eighth,ninth),ve要用f替 (fifth,twelfth),以y结尾变ie (twenty -twentieth),遇到几十几只变个位就可以,(twenty-four-twenty-fourth),