1.倍數表示法
a. 主語+謂語+倍數（或分數）+ as + adj. + as
I have three times as many as you.我有你三倍那麼多。
b. 主語+謂語+倍數（分數）+ 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（分數）+ 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，表示增加多少倍
The production of grain has been increased by four times this year.
2.分數表示法
構成：基數詞代表分子，序數詞代表分母。分子大於1時，分子的序數詞用單數，分母序數詞用複數：1/3 one-third ；3/37 three and three-sevenths