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1、基数词变序数词口诀,一、二、三,单独记,结尾是t,d,d; th从四起;八去t,九去e ; ve要用f替; 整十基数变序数,先把ty变成tie; 要是遇到几十几,前用基数后用序。,基数词 序数词 基数词 序数词 1 one 第一 first 2 two 第二 second 3 three 第三 third 4 four 第四 fourth 5 five 第五 fifth 6 six 第六 sixth 7 seven 第七 seventh 8 eight 第八 eighth 9 nine 第九 ninth 10 ten 第十 tenth 11 eleven 第十一 eleventh 12 twe
2、lve 第十二 twelfth 20 twenty 第二十 twentie 21 twenty-one 第二十一 twenty-first 22 twenty-two 第二十二 twenty-second 23 twenty-three 第二十三 twenty-third 99 ninety-nine 第九十九 ninety-ninth 100 hundred 第一百 hundredth,序数词,first second third fourth fifth sixth seventh eighth ninth tenth,twelfth,thirteenth,fourteenth,eight
3、eenth,nineteenth,twentieth,twelve,thirteen,fourteen,eighteen,nineteen,twenty,th结尾从4加起,ve要用f替,12 13 14 18 19 20,one two three four five six seven eight nine ten,9去e,ty变成tie,ve要用f替,8去t,123单独记,30 40 50 60 70 80 90,fifty,forty,thirty,sixty,seventy,eighty,ninety,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth,ty变成tie,整十的,基变序有规律, 一二三单独记, th结尾从4加起,八去t,九去e, ve要用f替,ty要用tie, 若是遇到几十几,只变个位就可以, 序数前要加the,我们一定要记牢。,first second third fourth fifth eighth ninth,one two three four five eight nine,twentieth,twenty,forty-fifth,forty-five,