time 倍
1.9年來這家公司的規(guī)模擴(kuò)大了一倍.
The company doubled its size in nine years.
2.這比那個大一倍.（注意：as large again as是…的兩倍,比…大一倍）
It is as large again as that.
3.這條街道比那條短四倍.
This street is four times shorter than that one.
4.她用功的程度是我的三倍.
She studies three times as hard as I.
5.他的財富是我的三倍還不止.
He is more than three times as rich as I.
6.我有五倍于湯姆的書.
I have five times the number of Tom's books.
7.這條街比那條街寬三倍.
This street is three times wider than that one.
8.這條線是那條線的四倍長.
This line is four times as long as that one.
英語分?jǐn)?shù)的表示法：
一、用“基數(shù)詞＋序數(shù)詞”表示
分?jǐn)?shù)在英語中通常是借助于基數(shù)詞和序數(shù)詞來共同表達(dá)的.其中基數(shù)詞表示分子,序數(shù)詞表示分母.
如：
1．The centimeter is one-tenth of the decimeter or one-hundredth of the meter．厘米是分米的十分之一,或者說是米的百分之一.
2．However,the number of boys will bea third or less than the girls in the class．但是,班里男生的人數(shù)將比女生少三分之一或更少.
從以上例子可以看出：分子除用one外,也可用a；如果分子大于1,分母要用復(fù)數(shù)形式.但是,1／2不能說a（one）second,而要說a（one）half.例如：
3．The sum of one half,one third and one fourth of a certain number is 13.某數(shù)的1／2,1／3和1／4的和是13.
1／4和3／4可以說a（one）fourth和three fourths,但常用a quarter和three quarters表示.應(yīng)該注意的是,分?jǐn)?shù)修飾名詞時,若該名詞是不可數(shù)名詞只能用單數(shù)；若是可數(shù)名詞,用單數(shù)或復(fù)數(shù)均可.但是,若它們在句子中作主語,則謂語動詞是用單數(shù)還是復(fù)數(shù)取決于名詞,即與分?jǐn)?shù)所修飾的名詞保持一致.例如：
4．Only one-fifth of air consists of oxygen．氧氣只占空氣的1／5.
5．About two thirds of the students attendthe meeting．大約2／3的學(xué)生都參加了會議.
帶分?jǐn)?shù)也是常見的英語數(shù)詞表達(dá).所謂帶分?jǐn)?shù),實(shí)際上是“整數(shù)＋分?jǐn)?shù)”,表達(dá)時分而述之,只是整數(shù)部分與分?jǐn)?shù)部分要用連詞 and連接.當(dāng)帶分?jǐn)?shù)修飾名詞時,該名詞通常是復(fù)數(shù),但若名詞置于整數(shù)one或a之后,則用單數(shù).“帶分?jǐn)?shù)＋名詞”作主語時,謂語動詞根據(jù)臨近原則要用復(fù)數(shù).例如：
6．You should finish the work within one and a fourth hours．你應(yīng)在1．25小時內(nèi)完成工作.
7．The atom breaks up in a minute and a quarter．原子在1．25分鐘內(nèi)裂變.
二、用per cent等表示
表示百分之一可以說one（a）hundredth,但更常用one percent或per cent,即用百分?jǐn)?shù)表示法來表達(dá).例如：
8．Our bodies are 65percent water．我們?nèi)梭w含65％水分.
9．Seventy-five percent of the earth'ssur- face is covered by water．地球表面的75％被水覆蓋著.
10．Eighty-five percent of the students in English department are girls．英語系85％的學(xué)生是女生.
三、用part表示
名詞part有“……分之一”的意思,分子大于1時,part用復(fù)數(shù).表示分?jǐn)?shù)的結(jié)構(gòu)一般有以下三種：
（1）“基數(shù)詞（或a）＋序數(shù)詞＋part（s）” a hundred part百分之一
（2）“基數(shù)詞＋part（s）＋in＋基數(shù)詞” five parts in one thousand千分之五
（3）“基數(shù)詞＋part（s）＋per＋基數(shù)詞” one part per million百萬分之一
四、用“基數(shù)詞＋介詞＋基數(shù)詞”表示
借助介詞表示分?jǐn)?shù),介詞前的數(shù)詞是分子,介詞后的數(shù)詞是分母.例如：
11．Ninety-nine people out of a hundred,if they were asked who first found America,would answer Clumbus．如果要問是誰首先發(fā)現(xiàn)美洲,一百個人中有九十九個（百分之九十九）將回答是哥倫布.
這種結(jié)構(gòu)中的介詞主要有in,out of,of以及to
12．The map is drawn to a scale of one of ten thousand．這張地圖是按萬分之一的比例繪制的.