數(shù)詞的用法

1）倍數(shù)表示法 a. 主語(yǔ)+謂語(yǔ)+倍數(shù)（或分?jǐn)?shù)）+ as + adj. + as I have three times as many as you.　我有你三倍那么多。

b. 主語(yǔ)+謂語(yǔ)+倍數(shù)（分?jǐn)?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(yǔ)+謂語(yǔ)+倍數(shù)（分?jǐn)?shù)）+ 形容詞（副詞）比較級(jí)+ than… The grain output is 8 percent higher this year than that of last year. 今年比去年糧食產(chǎn)量增加8%。

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. 今年糧食產(chǎn)量增加了4倍。

2）分?jǐn)?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(shí)，分子的序數(shù)詞用單數(shù)，分母序數(shù)詞用復(fù)數(shù)： 1/3 one-third ； 3/37 three and three-sevenths.