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序数词:表示顺序的数词叫序数词。 1、英语的序数词基本变法: (1)一般在基数词后加th,(2)-ve结尾的改为-fth,(3)-ty结尾的改为-tieth,(4)熟记特殊词。 2、序数词如下:
 1000th→onethousandth,1000000th→onemillionth.,第703→thesevenhundredandthird, 第5480→thefivethousandfourhundredandeightieth. 3、注:(1)两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词。如:thirty-sixth, (2)使用序数词时一般加定冠词the.如:I’minthethirdgrade. (3)序数词作“几分之几”讲时,有复数形式。如:1/5→onefifth;2/3→twothirds;4/7→ foursevenths;1/2→ahalf;1/4→aquarter;3/4→threequarters;50%→fiftyhundredths (fiftypercent).
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