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序数词表序数词的构成（1）两位数的词，只需把个位数变为序数词：第二十二twenty-second第三十一thirty-first第七十五seventy-fifth（2）三位数以上的词，只把最后的两位数变为序数词：第一百五十onehundredandfiftiety第一百六十七ninehundredandsixty-seventhⅠⅡⅢ1first（1st)11eleventh(11th)20twentieth(20th)2second(2nd)12twelfth(12th)30thirtieth(30th)3third(3rd)13thirteenth(13th)40fortieth(40th)4fourth(4th)14fourteenth(14th)50fiftieth(50th)5fifth(5th)15fifteenth(15th)60sixtieth(60th)6sixth(6th)16sixteenth(16th)70seventieth(70th)7seventh(7th)17seventeenth(17th)80eightieth(80th)8eighth(8th)18eighteenth(18th)90ninetieth(90th)9ninth(9th)19nineteenth(19th)10tenth(10th)