11)倍数+ as + adj. + as　<=> 倍数+ the … + of。例如：

This bridge is three times as long as that one. 这座桥的长度是那座的三倍。

This bridge is three times the length of that one.

Your room is twice as large as mine. 你的房间是我的两倍大。

Your room is twice the size of mine.

5. 形容词最高级用法

the + 最高级 + 比较范围

1)形容词最高级前通常必须用定冠词 the，例如：

The Sahara is the biggest desert in the world. 撒哈拉沙漠是世界上最大的沙漠。

形容词most前面没有the，不表示最高级的含义，只表示"非常"。例如：

It is a most important problem. =It is a very important problem. 这是个很重要的问题。

注意：使用最高级要注意将主语包括在比较范围内。

(错)　Tom is the tallest of his three brothers.

(对)　Tom is the tallest of the three brothers.

2) 下列词可修饰最高级，by far, far, much, mostly, almost。例如：

This hat is nearly / almost the biggest. 这帽子差不多是最大的了。

注意：

a. very可修饰最高级，但位置与much不同。

This is the very best.

This is much the best.

b. 序数词通常只修饰最高级。例如：

Africa is the second largest continent.非洲是第二大洲。