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2010中考英语总复习7数词 七、 数 词 ? (一) 知识概要 ?数词用来表示人或物的数目多少和顺序。所以数词主要有两种：基数词，用于计数，如：one, two而序数词用于表示位置先后或次序，台：first? second其构成法如下：? 阿拉伯数字 基数词 序数词 简写序数词 1 one first 1st 2 two second 2nd 3 three third 3rd 4 four fourth 4th 5 five fifth 5th 6 six sixth 6th 7 seven seventh 7th 8 eight eighth 8th 9 nine ninth 9th 10 ten tenth 10th 11 eleven eleventh 11th 12 twelve twelfth 12th 13 thirteen thirteenth 13th 14 fourteen fourteenth 14th 15 fifteen fifteenth 15th 16 sixteen sixteenth 16th 17 seventeen seventeenth 17th 18 eighteen eighteenth 18yh 19 nineteen nineteenth 19th 20 twenty twentieth 20th 21 twenty-one twenty-first 21st 30 thirty thirtieth 30th 40 forty fortieth 40th 50 fifty fiftieth 50th | 
