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.
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.
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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