3.分数词(fractional numbers) 1)构成：由基数词和序数词构成，基数词代表分子，序数词代表分 母。除了分子为1的情况外，序数词都要用复数形式： 1/4 one-fourth 7/9 seven-ninths 2/3 two-thirds 1/2 a (one)half 1/4 a (one)quarter 3/4 three-quarters 2)分数词在句中的作用 a.主语 A quarter of the clerks are communists. 四分之一的职员是共产党员。 b.宾语或介词宾语 They spent one-fourth of the household income on payment for houses by monthly stallments. 他们把家庭收入的四分之一用于住房还贷月供上。 c.表语或同位语 Twenty cents is one-fifth of a dollar. 二十美分是一美元的五分之一
3.分数词 (fractional numbers) 1)构成:由基数词和序数词构成，基数词代表分子，序数词代表分 母。除了分子为1的情况外，序数词都要用复数形式： 1/4 one-fourth 7/9 seven-ninths 2/3 two-thirds 1/2 a (one) half 1/4 a (one) quarter 3/4 three-quarters 2) 分数词在句中的作用 a. 主语 A quarter of the clerks are communists. 四分之一的职员是共产党员。 b. 宾语或介词宾语 They spent one-fourth of the household income on payment for houses by monthly stallments. 他们把家庭收入的四分之一用于住房还贷月供上。 c. 表语或同位语 Twenty cents is one-fifth of a dollar. 二十美分是一美元的五分之一
d.定语 It's one-twentieth the thickness of a human hair. 它相当于人头发丝的二十分之一那样细。 e.状语 This street is four times shorter than that one. 这条街道比那条短四倍。 4.小数的读法 6.4-six point four 0.8-zero point eight 0.05-zero point zero five 0.762-zero point seven two six 12.409-twelve point four oh nine 709.06-seven hundred and nine point oh six
d. 定语 It’s one-twentieth the thickness of a human hair. 它相当于人头发丝的二十分之一那样细。 e. 状语 This street is four times shorter than that one. 这条街道比那条短四倍。 6.4—six point four 0.8- zero point eight 0.05- zero point zero five 0.762- zero point seven two six 12.409- twelve point four oh nine 709.06- seven hundred and nine point oh six 4. 小数的读法
5.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 is49 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. 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
5.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. 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