1. 表示“几倍大小（长短；数量）”，由“倍数+ the size（length，amount……）”结构组成。
例如：
The earth is forth-nine times the size of the moon. 地球是月亮的49倍大。
2. 表示“……比……大几倍”，由“倍数+形容词（副词）比较级”结构组成。
例如：
This box is three times bigger than that one. 这个盒子比那个盒子大三倍。
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%。
3. 表示“……是……倍”，由“倍数+ as +形容词+ as +”结构组成。
例如：
Our factory is twice as big as theirs. 我们的工厂是他们的三倍。
I have three times as many as you. 我有你三倍那么多。
[注] 一倍用once，两倍用 twice。
4、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。