摘要: that代替前面提到的同类事物中特指的一个.该事物既可以是可数名词也可以是不可数名词,要有后置定语,但不可以有前置修饰语. [典型例题] Few pleasures can equal of a cool drink on a hot day. A. some B. any C. that D. those 答案: C 数词 表示数目多少或顺序多少的词叫数词.数词分为基数词和序数词.表示数目多少的数词叫基数词,表示顺序的数词叫序数词 一.基数词 1.基数词写法和读法:345 three hundred and forty-five, 2.基数词一般是单数形式.但下列情况.常用复数: a. 与of 短语连用.表示概数.不能与具体数目连 用.如scores of people 指许多人, b. 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. c. 表示"几十岁", d. 表示"年代".用 in +the +数词复数, e. 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---31st 三. 数词的用法 1.倍数表示法 a. 主语+谓语+倍数+ 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+ the size of- The earth is 49 times the size of the moon. 地球是月球的49倍. c. 主语+谓语+倍数比较级+ than- The grain output is 8 percent higher this year 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 three-sevenths. [命题趋向]

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