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数词 表示数目多少的数词叫基数词; 表示顺序的数词叫序数词。 序数词表示排列的顺序 序数词的缩写形式为阿拉伯数字加序数词的最后两个字母.如：first---1st;second---2nd; third-3rd; thirty-first---31st 基数词变序数词的巧记口诀 一,二,三要全变;(one-first; two-second;three- third) 其余都加th, th里有例外,8去t,(eight-eighth) 9去e(nine-ninth) 字母f代ve(five-fifth; twelve-twelfth); ty变成tie(twenty-twentieth) 若要变化几十几， 只变个位就可以(twenty-one-twenty-first) 数词的用法 (1)倍数表示法 a. 主语+谓语+倍数(或分数)+ as + adj. + as I have three times as many as you.我有你三倍那么多。 b. 主语+谓语+倍数(分数)+ the size (amount，length…) of… The earth is 49 times the size of the moon.地球是月球的49倍。 c. 主语+谓语+倍数(分数)+ 形容词(副词)比较级+ than… The grain output is 8 percent higher this year than that of last year. d. 还可以用by+倍数，表示增加多少倍 The production of grain has been increased by four times this year. (2)分数表示法 构成：基数词代表分子，序数词代表分母。分子大于1时，分子的序数词用单数，分母序数词用复数：1/3 one-third ;3/37 three and three-sevenths (责任编辑：admin) |