1. 表达方式：twice,three times, double, triple

　　2. 表达形式

　　(1)倍数+as+adj/adv原级+as

　　举例：

　　This apple is twice as big as that pear.

　　My grandpa is three times as old as me. The foreigner run four times fast as i do.This bag is twice as big as that one.Our house is three times as big as my friend’s house. (2) 倍数+adj/adv比较级+than

　　举例：

　　This apple is twice bigger than that pear.

　　My grandpa is three times older than me.The foreigner run four times faster than i do.This bag is twice bigger than that one.Our house is three times bigger than my friend’s house. (3) 倍数+the+Length/width,height/size(长宽高)+of

　　举例：

　　This wall is twice the width of that wall.

　　This ruler is three times the length of that eraserOur house is three times the size of my friend’s house.