大(da)小、长度、重量等表示(shi)法，特别是倍数表达法对于扩大(da)考生来说是重点也是(shi)难点，翻译、改错(cuo)等题型都可以出题，考试时(shi)不容易对付，要求考生必(bi)须熟练掌握和运用(yong)。
1，主语+系动词+数词+times(倍数)as+原级形容(rong)词+as+比较对象。
Asia is four times as large as Europe.
亚洲面积是(shi)欧洲的四倍。
He runs twice as fast as Mike．他跑的速度是(shi)迈克的两倍。(两倍只用twice就可以了。)
This TV set costs twice as much as that one．
这台电视机的价格是(shi)那台电视机的两倍。
The playground is 2．5 times as big as it was ten years ago．
这个操场是十(shi)年前的两倍半大。
This tree is three times as tall as that one.
这棵树是那棵树的三(san)倍高.
His father is twice as old as he.
他父亲的年纪有他两倍(bei)大。
其实：A is+n times 比较级 than B=A is n times as 原级 as B
Asia is four times as large as Europe.
= Asia is four times larger than Europe.
亚洲面积是(shi)欧洲的四倍。
The Yangtze River is almost twice as long as the Pearl River.=The Yangtze River is almost twice longer than the Pearl River.
长江差不多是珠江长两倍。
The dictionary is exactly five times as expensive as that one.=The dictionary is exactly five times more expensive than that one.
这本字典比那本(ben)恰好贵5倍。
The output is twice as much as that of ten years ago. = The output is twice more than that of ten years ago
产量是10年前的两倍。
three times as long as sth
=three times longer than sth某物的三(san)倍长
其他的句型(xing)转化也是同理。
2，A+系动词+数词+times+the+weight/width/depth/size/length等+of+比较对(dui)象。
The big box is five times the weight of the small one．
这个大(da)箱子的重量是小箱子(zi)的五倍。
The newly broadened square is four times the size of the previous one.
新扩建的广场是未扩建时的四倍大(da)。
说明:上(shang)述句型表示“是……的几倍"。其中的as…as之间要用形(xing)容词原级。此外，我们(men)可以用“倍数+the size／length／width／height／weight等单位名词+of…”来表示“……的尺寸(长度、宽度、高度、重量等)是……的(de)几倍"。
3，主语+谓语+倍(bei)数词/百分比+形容(rong)词／副词比较级+than+比较对(dui)象
I am twice older than Tom．
我的岁数是汤姆的两倍。
Your dog'S sense of smell is up to 1 00，000 times greater
你的狗的嗅觉灵敏是(shi)你的嗅觉的十万倍。
The university is three times bigger than it was in 1980．
这所大学(xue)现在是1980年时三倍那么大。
The grain output is 8 percent higher this year than that of
今年比去年粮食产量增加(jia)8％。
Manufacturing output has increased by 8%.
工业产量增长了8%。
Output will fall by 6%
产量将减少6%。
说明(ming):此句型表示“比……大(多、宽、高等)几倍”。其中的形容词(ci)要用比较级，而倍数词除(chu)了“两倍"可以用twice表示外(wai)，其他倍数都是由数字加上times所组成，例如“三倍”是three times， “四(si)倍"是four times，以此类推(tui)。
4，数词(ci)+单位量词词+形容(rong)词。
The wooden bridge is 20 metres wide．=The wooden bridge is 20 metres in width．这个木桥(qiao)有20米宽。
His father is six feet in height．=His father is six feet tall．他父亲身高六(liu)英尺。
This piece of luggage is 8 kilograms in weight．这件行李有八千克(ke)重。
The fish is two feet in length. 这条鱼有两英尺(chi)长。
We need a rope about 10 meters long. 我们需要一根约10米长的绳(sheng)子。
The well is about 30 meters deep. 这口井约30米深。
He is six feet in height. 他身高六英(ying)尺。
注意:1.此句型用来表示有关长、宽、高(gao)、面积等的数值大小。其(qi)中，单位词有metre，kilometre，inch，foot，yard，kilogram，ounce，pound等。形容词(ci)有long，wide，high，deep，heavy等。此外，还可以用“基数(shu)词+单位词+in+名词"表(biao)示。名词有length，width，height，depth，thickness，weight等。可以用by来把长度和宽(kuan)度的数值结合起来，用以说明一个物体(ti)的大小。
注意：2.表示重量时，可(ke)用 in weight 结构，如要表示“这个箱(xiang)子重10公斤”，可说(shuo)：
The box is 10 kilos 或The box is 10 kilos in weight，但习惯上不说 The box is 10 kilos heavy。
注意：3.
I'm twice/double his age.
我的年龄是他的两(liang)倍。
I've paid five times the usual price for the stamp.
我出了5倍于往常的价格买这(zhe)枚邮票。
The average income of the staff has been increased by 50 percent compared with last year.
与去(qu)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(shuang)重的) down over these years.
近几年来,电视机的价格下降了(le)两倍。
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