情况,常用复数:? а a. 在一些表示"一排"或"一组"的词组里;? 如:They arrived in twos and threes. 他们三三两两的到达了。? b. 表示"几十岁";? c. 表示"年代",用 in +the +数词复数;? d. 在乘法运算的一种表示法里,如:3 x 5 = 15 Three fives is ? (are) fifteen.?? 二、序数词? 序数词的缩写形式: first---1st second---2nd thirty-first---31stР三、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 of this year is 8 percent higher than that of last year.? ? 今年比去年粮食产量增加8%。?? 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.? 今年粮食产量增加了4倍。??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 thirty-sevenths.
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