比较级、倍数

1、一、用times 表示倍数（一般限于包括基数在内三倍或三倍以上的数。表示两倍的数，一般用twice ）。其句式有：1. “times +形容词/副词的比较级+ than”例如：Line AB is three times Ion ger tha n line CD.线段AB是（线段）CD的三倍长。This hall is five times bigger than our classroom.这个大厅比我们的教室大5倍。2. “times +as + 形容词/副词的原级+ as”例如：This table is three times as long as that one.这张桌子是那张桌

2、子的三倍长。This dictionaryis five times as thick as the one you borrowed fromthe library.这本词典的厚度是你从图书馆借的那本（厚度）的 5倍。3. “times + the + 名词（如：size, height, weight, length, width 等） + of”例如：The earth is 49 times the size of the moon.地球的体积是月球的49倍。This river is three times the depth of that one.这条河是那条河的三倍深。4. “

3、times + more +名词+ than ”例如：He earns five times more money than he did ten years ago.他现在挣的钱比十年前挣的多 5倍。There are twice more stude nts in our class tha n in theirs.我们班的学生人数比他们班多两倍ten5. “times +as many （或 much ）+名词+ as ” 例如：We've produced twice as muchcotton this year as （ we did ） years ago.今年我们生产的

4、棉花比十年前多了一倍。（汉语中的多一倍实际上也指 两倍一样多。）He has got three times as many books as his sister.他拥有的书的数量是他妹妹的3倍。6. “times + what 从句”例如：The len gth of the road is four times what it was three years ago.这条路的长度是三年前的4倍。The price of the meat is twice what it was last year.肉价是去年的两倍。7. “times + up on （或 over ） ” 例如：The

5、 size of the sun is a million times over that of the earth.太阳的体积比地球的体积大一百万倍。He is three times up on your age.他的年龄是你的4倍（或：比你的年龄大3倍）。8. “+by + times ” 例如：Compared with last year, our coal output has in creased by three times.与去年相比，我们的煤产量增长了3倍。His speed is faster than mine by four times.他的速度比我的快4倍。9. “

6、times + compared with+被比较对象” 例如:The nu mber of the stude nts in our school has in creased for times compared with 1980.我们学校的学生人数比1980年增加了 3倍。10. “times + that of + 被比较对象” 例如：In this workshop the output of July was 3.5 times that of January.这个车间七月份的产量是元月份的3.5倍。二、用分数、百分数表示倍数。例如：The box is on e-third b

7、igger tha n that one.这个盒子比那个盒子大三分之一。Last year the output value of industry was 59 percent higher than that of 1976.去年工业产值比1976年增长了 59 %。My comma nd of En glish is not half so good as yours.我英语掌握得还不及你的一半儿好。三、用 again , double （两倍）,triple（三倍）,fourfold （四倍）等词表示倍数。例如：as large aga in as两倍于，比大一倍as many aga

8、 in as比多一倍，加倍as much aga in as比多一倍，加倍as old aga in as年纪比大一倍My Aunt is as old aga in as I am.我姑姑的年龄比我大一倍。The top-bra nd clothes are ofte n sold as double the no rmal pricehere.这里名牌衣服的售价经常比正常的售价高一倍。The new work procedure tripled the output.新工艺使产量增加两倍。The output of grain in creased fourfold.粮食产量增加了三倍。四、用double表示倍数1. double用作形容词，表示“两倍的”。如：The product ion is now double what it was ten years ago.现在的产量是十年前的两倍。2. double 用作动词，表示“是的两倍。如：The output has bee n doubled in the past six years.