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数词的语法基础知识介绍

时间:2017-09-30 13:09:30 基础英语 我要投稿

数词的语法基础知识介绍

  数词有基数词和序数词两大类。小编整理了数词的语法基础知识介绍,欢迎欣赏与借鉴。

数词的语法基础知识介绍

  基数词

  (1)1-20

  one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen,seventeen,eighteen,nineteen,twenty

  (2)21-99 先说“几十”,再说“几”,中间加连字符。

  23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one

  (3)101—999先说“几百”,再加and,再加末两位数或末位数;

  586→five hundred and eighty-six,803→eight hundred and three

  (4)l,000以上,先从右往左数,每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“,”前为billion

  1,001→one thousand and one

  18,423→eighteen thousand,four hundred and twenty-three

  6,260,309→six million two hundred and sixty thousand three hundred and nine

  750,000,000,000→seven hundred and fifty billion

  序数词

  (1)一般在基数词后加th

  eg.four→fourth,thirteen→thirteenth

  (2)不规则变化

  one→first,two→second,three→third,five→fifth,eight→eighth,nine→ninth,twelve—twelfth

  (3)以y结尾的.十位整数,变y为ie再加th

  twenty→twentieth, forty→fortieth, ninety→ninetieth

  (4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。

  twenty-first,two hundred and forty-fifth

  基数词转为序数词的口诀:

  基变序,有规律,词尾加上-th.

  一,二,三,特殊记,词尾字母t,d,d.

  八去t,九去e, ve要用f替。

  ty将y变成i,th前面有个e.

  若是碰到几十几,前用基来后用序。

  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.

  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.

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