1. 表示几倍大小(长短；数量)由倍数+ the size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。