倍数表达法.doc

倍数表达法是历届高考的热点。当我们要表达甲是乙的几倍时，通常可使用以下句型：
1.倍数+as+形容词或副词的原级+as+其它。这种结构又常演变成下列两类：①倍数+as+many+可数名词复数+as;②倍数+as+much+不可数名词+as。如：
There are seven times as many people as I expected.是我预料的人数的七倍。
There is five times as much coffee in this glass as in that one.这个杯子里的咖啡是那个杯子里的五倍。
2.倍数+形容词（或副词）的比较级+ than+其它。如：
The hall is five times bigger than our classroom.这个大厅的面积比我们教师大五倍。
3.倍数+the size/height/length/width.etc.+of+其它。如：
This road is six times the length of that one.这条路是那条路的六倍长。
4.计量名词+of+名词+be+倍数+that+of+其它。如：
The size of the newly broadened square is four times that of the previous one.新扩建的广场为以前的四倍大。
5.倍数+what从句。如：
The production is now three times what it was ten years ago.现在的产量是十年前的三倍。
6.倍数+more+名词+than+其它。如：
There are nine times more books in his bag than in yours.
他书包里的书比你书包里的书多九倍。
7.其它表达。如：
She's twice/double my age.她的年龄是我的两倍。
The average income of the staff has been increased by 50 percent compared with last year.
与去年相比，该单位职工的收入已增加了50%。
He runs faster than me by three times.他跑得比我快三倍。
{考查方向}
1）倍数在句中的位置一般放在第一个as前面或比较级前面或名词前面。
2）用times表示倍数时，一般只限于表示包括基数在内的三倍或三倍以上的数。表示两倍可以用twice或double,一倍用once.
【重点归纳】
除了我们初中所学的形容词的比较级的用法，本模块我们主要归纳几种句式结构：
（一）含倍数的比较句型
1.倍数+as+形容词原级+as…。如：
This bridge is three times as long as that one.
His room is twice as big as mine;in other words,mine is only half as big as his.
【特别提醒】
“as…as”中间加入名词的句式：
●倍数+as+形容词+a/an+可数名词单数+as…
●倍数+as+形容词+可数名词复数/不可数名词+as…。如：
Last year my brother twice as big a new house as mine.
He has collected more than three times as many stamps as I (have).
I spent twice as much time on my studies as you did.
【难点点拨】
该结构的省略：通常省略形容词后面的名词及比较的部分。如：
I have to transfer(转乘）buses so I spend twice as much (money as others)for the bus every day.
2.倍数+形容词比较级+than…。如：
This street is four times shorter than that one.
Fear of danger is ten thousand times more terrifying than danger itself.
【特别提醒】
倍数+形容词比较级+名词+than…。如：
He earns five times more money now than he did ten years ago.
There are three times more books in our library than in yours.
3.倍数+the+名词（如size,height,weight,length,width,depth等）+of…。如：
This well is three times the depth of that one.
4.另外，请注意下面两种说法：
（1）倍数+what从句。如：
The length of the road is four times what it was three years ago.
(2)倍数+that of+被比较对象。如：
Airmail charges almost twice or three times that of a normal mail.
(二）其它句式
1."比较级+and+比较级"表示"越来越…"。如：
Things are getting better and better every day.
Our country is becoming more and more beautiful.
2."the+比较级…，the+比较级…"表示“越…，就越…”。如：
The more you have, the more you want.
The more a man knows, the less he knows he knows.
【知识扩展】
在形容词比较级前可以加a little, a bit, a lot, no, any, much, far, even,still等副词（组表示程度的加深。如：
The result is much better than we expected.
Actually, health is far more important than wealth.