數(shù)詞

表示數(shù)目多少的數(shù)詞叫基數(shù)詞;

表示順序的數(shù)詞叫序數(shù)詞。

序數(shù)詞表示排列的順序

序數(shù)詞的縮寫形式為阿拉伯數(shù)字加序數(shù)詞的最后兩個字母.如：first---1st;second---2nd;　third-3rd;

thirty-first---31st

基數(shù)詞變序數(shù)詞的巧記口訣

一,二,三要全變;(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變成tie(twenty-twentieth)

若要變化幾十幾，

只變個位就可以(twenty-one-twenty-first)

數(shù)詞的用法

(1)倍數(shù)表示法

a. 主語+謂語+倍數(shù)(或分數(shù))+ as + adj. + as

I have three times as many as you.我有你三倍那么多。

b. 主語+謂語+倍數(shù)(分數(shù))+ the size (amount，length…) of…

The earth is 49 times the size of the moon.地球是月球的49倍。

c. 主語+謂語+倍數(shù)(分數(shù))+ 形容詞(副詞)比較級+ than…

The grain output is 8 percent higher this year than that of last year.

d. 還可以用by+倍數(shù)，表示增加多少倍

The production of grain has been increased by four times this year.

(2)分數(shù)表示法

構(gòu)成：基數(shù)詞代表分子，序數(shù)詞代表分母。分子大于1時，分子的序數(shù)詞用單數(shù)，分母序數(shù)詞用復數(shù)：1/3 one-third ;3/37 three and three-sevenths

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