1)倍数＋形容词/副词比较级＋than 
 
The girl is ten times cleverer than her brother. 

2)倍数＋as+形容词/副词/(名词)＋as 
 
His apartment is three times as large as that of mine. 

Americans eat( )as they actually need every day. (CET-4 1998,6) 

A) twice as much protein 
B) twice protein as much twice 
C) twice protein as much 
D) protein as twice much

    本题考查倍数的表达方法，正确形式应为：倍数＋as+形容词/副词/(名词)＋as，故答案为A.

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3)倍数＋名词 
 
The sun is many times the size of the moon. 

4)动词＋倍数 

The pants have shortened two times since they were bought. 

5)动词+by+数词/百分比/倍数 
 
The landlord wanted to raise the rent by a third. 

Between 1974 and 1997, the number of overseas visitors expanded 
( )27%. (CET-4 2000,1) 

A) by 
B) for 
C) to 
D) in 

本题考查动词+百分比的表达方法，正确的连接词为by，故答案为A.