1.A be 倍数 as 计量形容词原级 as B.
This tree is three times as tall as that one. 这棵树是那棵树的三倍高。
His father is twice as old as he. 他父亲的年纪有他两倍大。
2.A be 倍数 计量形容词比较级 than B
The Yangtze River is almost twice longer than the Pearl River.
The dictionary is exactly five times more expensive than that one.
3.A be 倍数 the 计量名词 of B
The newly broadened square id four times the size of the previous one.
4.The 计量名词 of A be 倍数 that of B
The size of the newly broadened square is four times that of the previous one.
I"m twice/ double his age. 我的年龄是他的两倍。
I"ve paid five times the usual price for the stamp.
The average income of the staff has been increased by 50 percent compared with last year. 与去年相比，该单位职工的收入增加了50%.
The price of TVs are twofold（ adj. 两部分的, 双重的） down over these years.