初中英语—数词

第一篇：初中英语—数词

初中英语—数词

数词分为基数词和序数词两种。表示数目或数量多少的词叫基数词；表示数目顺序的词叫序数词。

一.基数词

1.基数词就注意以下几点：

（1）几十几的基数词的十位数与个位数之间要用连字符“-”连接。如：

eighty-five 85

twenty-six 26

（2）三位数的基数词须在百位和十位（若无十位则和个位）之间用and连接。如：three hundred and sixty-five 365

two hundred and six 206

（3）基数词的复数形式。当基数词hundred, thousand, million, billion等词前有具体数词或several修饰时，必须用单数。如：

several hundred year’s ago几百年前

two thousand students两千个学生

2.基数词的特殊用法：

（1）表示“几十年代”或“几十岁”时，用逢十的基数词的复数形式。如：

in the 1990’s 20世纪90年代

in one’s twenties在某人20多岁时

（2）用在习语中。如：

in twos and threes三三两两地

二.序数词

序数词应注意的几点事项：

1.多位数的基数词变成序数词时，只需将末位基数词变成序数词，前边的基数词不变。如：forty-two 42 forty-second第42

nine-hundred 900 nine-hundredth第900

2.当序数词用阿拉伯数字表示时，必须在数字后加上序数词的最后两个字母。如：21st第21

32nd第32

3.序数词前一般要用定冠词the，如果序数词前用a或an时，则表示“又一；再一”（没有具体范围的限制）。如：

Though he had failed twice, he wanted to try a third time.尽管他已失败了两次，他还想再试一次。

The little monkey had had three apples, and he wanted to eat a fourth one.那只小猴子已经吃了3个苹果，他还想再吃一个。

三.分数和百分数

1.分数

（1）分数的分子用基数词，分母用序数词。如：

one fifth五分之一

one tenth十分之一

（2）当分子大于1时，分母用序数词的复数。如：

two thirds三分之二

five eighths八分之五

（3）当分子是1时，可以用one也可以用a。如：

a second = one second

a third = one third

（4）当分母是2和4时，分别可以用half和quarter代替。如：

a half二分之一

three quarters四分之三

2.百分数

百分数用percent表示。如：

forty percent百分之四十

three percent百分之三

3.分数、百分数与主谓一致

分数、百分数的考查往往和主谓一致相联系。当分数、百分数修饰可数名词的复数时，谓语动词用复数形式；当分数、百分数修饰不可数名词时，谓语动词用单数形式。如：Eighty percent of the students in our school come from Henan.我们学校百分之八十的学生来自河南。

Three fourths of the students in my class are interested in English.我们班四分之三的学生对英语感兴趣。

Two thirds of the water on the earth is sea water.地球上三分之二的水是海水。

四.倍数的表示法

1.表示“几倍大小（长短；数量）”，由“倍数+ the size（length, amount...）”结构组成。如：The earth is forth-nine times the size of the moon.2.表示“……比……大几倍”，由“倍数+形容词（副词）比较级+ than +被比较部分”结构组成。如：

This box is three times bigger than that one.3.表示“……是……倍”，由“倍数+ as +形容词+ as +被比较部分”结构组成。如：Our factory is twice as big as theirs.练习※答案

()1.Lincoln was born on ________.A.February 12, 1809B.1809, February 12C.1809, 12 FebruaryD.February 1809,12

()2.A _______ boy can sing the English song very well.A.ten-year-oldB.ten years oldC.ten-year-oldD.fifth years old

()3.An hour later, _____ minister was sent to see the “magic cloth” woven by those two men.A.twoB.the secondC.the twoD.second

()4.Abraham Lincoln was _______ President of the United States.A.16B.the 16C.16thD.the 16th

()5.Do you think there is any room for us ________ ?

A.twoB.the twoC.secondD.the second

()6.How many students are there in your class?

________.A.Twenty nineB.Thirty and twoC.Forty-fiveD.fifties

()7.Which number is wrong? _______.A.NinetyB.NinteenC.NinthD.Nineteenth

()8.The People's Liberation Army was founded _______.A.on August 1, 1927B.in 1927, 1 AugustC.on August 1st, 1927D.in August 1, 1927

()9.The number 4,123 is read _______.A.four thousand one hundred and twenty-threeB.four thousand and one hundred twenty-three

C.four thousand and a hundred and twenty-threeD.four thousands a hundred and twenty-three

()10.The old professor still works hard though he is _________.A.in his sixtyB.in his sixtiesC.in sixtiesD.in the sixty

()11.This classroom is ________ ours.A.three times big asB.as three times big asC.three times as big asD.as big three times as

()12.The basketball team of our school ranks ________ in the match.A.threeB.thirdC.the threeD.the third

()13.Which is the car that he drives? It's ________.A.fifty twoB.the fifty-two carsC.the car fifty fourD.the fifty-fourth car

()14.Which of the following is wrong? ________.A.He is a fifteen-year-old boy.B.He is at the age of 15.C.He is a boy of 15.D.He is fifteen year old.()15.Our school is not very big.There are only ________ students.A.nine hundreds ofB.nine hundredC.nine hundredsD.nine hundred of

()16.How many new words are there in ________ lesson?

There are only _________.A.five;fifthB.fifth;fiveC.the fifth;the fiveD.the fifth;five

()17.________, Coca-Cola began to enter China's market.A.In 1970'sB.In 1970sC.In the 1970s'D.In the 1970s

()18.There was no bus in that small town.We had a ________.A.ten miles walkB.ten-mile walkC.ten mile's walkD.tenth mile walk

()19.Today is the first day and ________.A.Tuesday is fourthB.Thursday is the fourthC.second is Tuesday D.a second is Thursday

()20.Which room do you live in? ________.A.The 201 RoomB.Room 201C.Room 201stD.The 201's Room

()21.How many magazines do you have? I have ________.A.twoB.bothC.twiceD.the second

()22.Three hundred thousand one hundred and seventy means ________.A.3,170B.3,117C.300,170D.30,170

()23.On May ________, ________ people traveled round the country.A.the first, millionsB.the first, millions ofC.first, the millionthD.first, millions

()24.________ of them are dining at school.A.TwelveB.TwelfthC.The twelveD.the 12th

()25.It's 7:17 is read ________.A.seven and seventeenB.seven sevenC.seven one sevenD.seven seventeen

()26.Four ________ two is two.A.plusB.minusC.timesD.divided by

()27.Three ________ five is eight.A.plusB.minusC.timesD.divided by

()28.Three ________ seven is twenty-one.A.plusB.minusC.timesD.divided by

()29.Forty-two ________ seven is six.A.plusB.minusC.timesD.divided by

()30.There are ________ days in a year.A.three hundred sixty and fiveB.three hundred and sixty-five

C.three hundreds and sixty-fiveD.three hundred sixty-five

()31.There are ________ students in that school.A.two thousand eight-sixB.two thousand eighty-six

C.two thousand and eighty-sixD.two thousands and eighty-six

()32.It took me ________ to get there.A.two hours and a halfB.two hours and half

C.two hour and a halfD.two hour and half

()33.September is _________ month of the year.A.the ninethB.the ninthC.ninethD.ninth

()34.Please pass me _______ book on the left.A.thirdB.threeC.the thirdD.the three

()35.________ is a very tall boy.A.The twelveB.The twelvethC.The twelfethD.The twelfth

()36.We have known each other for ________.A.a year and halfB.a year with halfC.a year and a halfD.a year with a half

()37.“What year is it?”

“It's ________.”

A.nineteen hundred and ninety-sevenB.nineteen and ninety-seven

C.nineteen ninety and sevenD.nineteen ninety-seven

()38.“What's the date today?”

“It's _________.”

A.TuesdayB.June FourthC.June the fourD.June the fourth

()39.The train from Shanghai will arrive ________.A.in quarter past sixB.in a quarter past sixC.at quarter past sixD.at a quarter past six

()40.My friend was born on _________.A.three of July, 1979B.the third of July,1979

C.1979, July the thirdD.1979, the third of July

()41.________ is less than ________.A.One-third;two-thirdsB.One-third;two-third

C.First-three;first-threesD.One-third;one-three

()42.Which lesson did you learn yesterday? ________.A.Lesson SevenB.Lesson seventhC.The 7 LessonD.7 Lesson

()43.“What's the date today?” “It's _______.”

A.the fourth of mayB.the fourth MayC.May fourD.May the fourth

()44.334 is read ________.A.three hundreds and thirty fourB.three hundreds thirty four

C.three hundred and thirty fourthD.three hundred and thirty-four

()45.In February, there are only _________ days.A.twenty nineB.twenty-ninethC.twenty-nineD.twenty eight

()46.There will be a comedy on TV at ________ this evening.A.seven past thirtyB.half past sevenC.seven the thirtyD.thirty to seven

()47.It took me ________ to find out the key to the drawer.A.one and half hoursB.one and a half hoursC.one and a half hourD.one and half hour

()48.I'm so tired after ________ walk.A.three hoursB.three hours'C.three hour'sD.three hour

()49.There are ________ stars in the sky.A.million ofB.millions ofC.the millionD.a million of

()50.the street is ________ wide.A.two metersB.two meterC.the two meterD.a two meter

Key:

1.A2.C3.B4.D5.A6.C7.B8.A9.A10.B11.C12.D13.D14.D15.B16.D17.D18.B19.B20.B21.A22.C23.B24.A25.D26.B27.A28.C29.D30.B31.C32.A33.B34.C35.D36.C37.D38.D39.D40.B41.A42.A43.D44.D45.C46.B47.B48.B49.B50.A

第二篇：初中英语数词教案

数词

1.基数词

表示数目的词称为基数词。其形式如下： A．从1——10 one，two，three，four，five，six，seven，eight，nine，ten． B．从 11——19 eleven，twelve，thirteen，fourteen，fifteen，sixteen，seventeen，eighteen，nineteen．

这里除 eleven，twelve，thirteen，fifteen，eighteen为特殊形式外，fourteen，sixteen，seventeen，nineteen都是由其个位数形式后添加后缀-teen构成。C．从 21——99 整数几十中除twenty，thirty, forty，fifty，eighty为特殊形式外，sixty，seventy，ninety都是其个位数形式后添加后缀-ty构成。表示几十几时，在几十和个位基数词形式之间添加连字符“-” 21 twenty-one

seventy-six D．百位数

个数基数词形式加“hundred”，表示几百，在几十几与百位间加上and．

a hundred and one

320 three hundred and twenty

648 six hundred and forty-eight E．千位数以上

2,648 two thousand six hundred and forty-eight F．hundreds of 数百

thousands of

数千

比如 There are hundreds of people in the hall．大厅里有数以百计的人。G．表示人的不确切岁数或年代，用几十的复数形式表示。He became a professor in his thirties． 他三十多岁时成为了教授。序数词的构成及其说明

1)序数词第一、第二和第三为first,second和third,其他序数词的构成是在基数词后加th。例如：

six→sixth seven→seventhten→tenth four→fourth

2)five------fifth(第五)、eight------eigth(第八)、nine-------ninth(第九)和twelf-----twelfth(第十二)

3)二十、三十等基数词变为序数词时,要把y变成ie再加-th。例如：

twenty→twentiethforty→fortieth

4)基数词几十几变成序数词时,表示几十的数词不变,只把表示几的基数词变成序数词。例如：

twenty-one→twenty-first

forty-five→forty-fifth

5)第一百、第一千、第一百万、第十亿都是在基数词后直接加th构成。例如：

hundred→hundredth第一百 thousand→thousandth第一千

6）.序数词的缩略形式是由阿拉伯数字加序数词的最后两个字母构成。例如：

1st,2nd,3rd,4th,21st,32nd,40th

序数词前面要加定冠词the。例如the first time

时刻表示法

1.表示几点钟用基数词加可以省略的o`clock

5:00 读作 five o`clock 或 five 2.表示几点过几分，在分钟后加past，再加小时

five past seven 七点过五分

half past six 六点半 a quarter past eight 八点过一刻 3.表示几点差几分，在分钟后面加to，再加小时

ten to eight 差十分八点（七点五十分）

a quarter to twelve 差一刻十二点（十一点四十五分）

twenty to six 差二十分六点（五点四十分）在日常生活中，常用下列简单方法表示时间。以小时、分种为单位分别读出数字。

6:31 读作 six thirty-one

14:03 读作 fourteen o three

23:55 读作 twenty-three fifty-five 注：时刻表上的时间大多采用24小时表示法，这样就不需要用a.m.表示上午，p.m.表示下午了。年代用定冠词及基数词表示的世纪加十位整数的复数形式构成

in the 1930`s（in the thirties of the twentieth century或 in the nineteen thirties）在二十世纪三十年代 in the 1860`s（in the sixties of the 19th century或 in the eighteen sixties）

由数词和其他名词构成的名词性短语作定语时，其中的名词用单数形式，名词性短语中各部分间要用连字符“-”来连接。She’s a sixteen-year-old girl．

第三篇：2013年初中英语词性系列 数词

英语词性系列之数词

1.数字的表示

三位数数词要在百位和十位(若无十位则和个位)之间加and。

1，000以上的数字，从后向前第三位数加一个“，”，第一个“，”前为thousand，第二个“，”前为million，第三个“，”前为billion。

2.序数词除了first，second，third外，其余都在基数词尾加-th构成。

3.分数分子在前，分母在后，分子用基数词，分母用序数词，当分子大于1小时，分母序数词要变成复数。

4.Hundreds(thousands，millions)of„„用法。

第四篇：初中英语数词专练带初中翻译题

初中英语中考专项练习之数词

姓名 成绩

1.He always wanted to have ___of books and he has recently bought four ____.A.hundred,hundredB.hundreds,hundred

C.hundreds,hundredsD..hundred,hundred

2.here are ____workers in the factory.A.two thousandsB.two thousand

C.two thousands ofD.two-thousand

3.The People’s Republic of China was founded ____,1949.A.in October 1B.on October 1stC.in October 1stD.October 1

4.Lucy:When were you born?Bill：I was born ___,1970.A.on October twelvethB.on October twelfth

C.on October twelvesD.in twelfth October

5.Tom was ___to get to school and I was ____.A.first,ninthB.a first,a ninth

C.the first,the ninthD.the second,the nineth

6.Autumn is ____season in a year.A.the fourthB.a thirdC.the thirdD.the threeth

7.__of the books are English ones.A.One-fifthB.One-fifthsC.One-fiveD.first-fifth

8.Beijing is ____largest city in China.A.secondB.the secondC.twoD.the two

9.—David，how old is your father this year?

__ _________.And we just had a special party for his_______birthday last week.A.Fortieth;fortyB.forty;fortyC.Forty;fortiethD.Fortieth;fortieth

10.The teacher said ______boys must take part in the dance show.A.two thirdB.two thirdsC.two threeD.twos threes

11._______people died in Wenchuan earthquake.It's terrible.A.ThousandB.Thousand ofC.Thousands ofD.Two thousands

12.About ____of the students in our class were born in the _____.A.two third,in the 1990sB.two thirds, in the 1990

C.two thirds,in the 1990sD.two thirds, in the 1990

13.___How do you read‘march 8th“？

——it reads”march _______"

A.eightB.eighthC.the eighthD.the eight

14.The olympic games are held _____.A.every four yearsB.every four year

C.every fourth yearsD.every four--years

15.-----Jakie Chan has donated _____dollars to charity.-----he is really a good example to us.A.thousandB.thousand ofC.thousands ofD.thousands

16.Football is so exciting that _____people in the world play it.A.millionB.millions ofC.two millions ofD.three millions of

17.---Do you have enough students to clean the room?

----No, i think we need _______students.A.anotherB.more twoC.two moreD.more one

18.My uncle bought me an iphone for my ________birthday.A.twelveB.twelfthC.the twelveD.the twelfth

19Now,everybody please turn to page ____and look at the _____picture.A.fifth,fifthB.five,fifthC.fifth,fiveD.five ,five 将下列句子翻译成英语

1、谢谢你把字典借给我。

2.他太害羞不敢在公共场合做演讲。

3.我们的作业必须准时交。

4.你知道火车站是什么时候修建的吗？

参考答案：1-5 BBBBC6-10 CABCB11-15 CCCAC 16-19 BCBB1、thank you for lending me the dictionary.2、He is too shy to make a speech in public.3、Our homework must be handed in on time4、Do you know when the railway station was built?

第五篇：数词教案

一、概述

数 词

表示数目与顺序的词，叫做数词（numeral）。数词有两种：基数词和序数词。数词与不定代词相似，其用法相当于形容词或名词。可以在句中充当句子成分，如可用作主语、定语、宾语、介词宾语、表语、同位语或状语等。

One added to six is seven.六加一等于七。（基数词作主语）

二、基数词

表示数目的词是基数词（cardinal numeral），如one(一)，two

（二），thirty（三十）等。

1、最基本的基数词

2、其它基数词

（1）21-99先“几十”再”几”，中间加连字符。21 twenty-one 25 twenty-five 99 ninety-nine（2）100及100以上的基数词

100及100以上的基数词，以末位向前推（每三位一节），依次须用到hundred, thousand, million, billion等。（3）基数词的读法

①三位数的读法:第一个数字+hundred+ and+后面的一位或两位数字 101→ one hundred and one 450→ four hundred(and)fifty ②1，000以上的数的读法:先从后向前数，每三位数加一个逗号，第一个逗号前的数字用thousand(千)，第二个逗号前的数字用million(百万)，用 “几十thousand”表示 “几万”，以 “几百thousand”表示 “几十万”，用 “几十million”表示 “几千万”，用”几百million”表示 “几亿”。百位与十位（或个位）之间用and（偶尔可不用）5，643→ five thousand six hundred and forty-three 865，432 → eight hundred sixty-five thousand four hundred and thirty-two 6，000，000→ six million 60，000，005→ sixty million and five

3、基数词的用法（1）基数词的功能

基数词在句子中可以做主语、宾语、定语、表语、同位语等，其句法功能基本上相当于名词或形容词。

One and two is three.一加二等于三。（做主语，表语）

Fifty divided by five is ten.五十除以五等于十。（做主语，表语）

I wanted three, but he gave me two.我想要三个，他却给我两个。（作宾语）It brings us in two million dollars a year.这给我们带来每年两百万美元的收入。（作定语）

Is there room for us three? 有我们三人的位置吗？（作同位语）

The town has a population of one hundred thousand.这个城镇拥有十万人口。（介词宾语）

（2）事物编号一般用基数词

第209房间 Room 209 第三部分 section 3/part 3 南京路308号 308 Nanjing Road 电话号码398688 TEL 3698688（3）某些数学算式表示法

3+2=5 Three/and/plus/added two is/equals five 10-5=5 Ten minus/less five is five。Five from ten leaves five.（4）hundred，thousand，million的用法

①当前面有数词以及many，several等词修饰时，这三个词用单数形式，后面直接跟复数名词。

Two hundred old people died of cold last winter.去年冬天200名老人被冻死。②当这几个词前面没有数词而后面有of时，则一定要用复数形式，表示数百、数千等笼统的数目概念。

hundreds of dollars 数百美元

（5）score(二十)，dozen(打；十二个)的用法 ①dozen 当dozen与基数词或many, several等连用时，不加“-s”，所修饰的名词前常省去of。但是，在a dozen of these people, two dozen of them等短语中应加of。这是因为习惯上在these, those, us等词前，应该用dozen of的缘故。

two dozen books 两打书 two(many, several)dozen pencils 两打（几打）铅笔 ②score score意为“二十”。two score of people中应加of，但three score and ten people，“70人”中不加of。scores of people意为“许多人”。

上述这两个词的复数形式与of连用时，表示不确切的数量，意为“许多……，大量的…… ”。for dozens of years 好几十年以来 scores of years ago 许多年前

三、序数词

表示顺序的词是序数词（ordinal numeral），如first(第一)，second(第二)，thirtieth(第三十)等。序数词前一般要加定冠词。

1、最基本的序数词（1）序数词1-19 除第一（first），第二（second）,第三（third）有特殊形式外，其余均由-th结尾即基数词+th构成，其中有几个序数词加-th时拼法不规则，分别是fifth, eighth, ninth, twelfth，需多加注意。

（2）十位整数的序数词

十位整数的序数词的构成方法是将相应的基数的词尾-ty中的y变为i，然后再加-eth,如forty-fortieth.（3）第“几十几”

基数词“几十几”变成序数词时，仅将个位变成序数词。twenty-two → twenty-second（4）序数词的缩写形式

序数词的缩写形式由阿拉伯数字加上序数词的最后两个字母构成。

first→1st second→2nd third→3rd forth→4th twenty-first→21st ninety-fifth→95th

2、序数词的用法（1）序数词的功能

序数词在句子中可用做主语、宾语、定语、表语等，主要用作定语，其前面常用定冠词the。（2）序数词前不用定冠词的情况

①表示顺序的语气很弱，具有“又一”、“再一”的意思时，其前要用不定冠词，不用定冠词。

I'll have to do it a second time.我只得再做一次。

②序数词前有指示代词、物主代词、名词所有格或every时，不用定冠词。

Berlin in 1929 held a public celebration on Einstein’s fiftieth birthday.柏林在一九二九年爱因斯坦第五十岁生日时举办了一个公开庆祝会。③在表示分数的序数词前不用定冠词。

From then on he toured three-fourths of Beijing.从那以后他逛了四分之三的北京城。④数词与名词构成复合名词时，不用定冠词。

There is a first-class hotel over there.那边有一个一流的宾馆。

⑤序数词用作副词时，不用定冠词。

Why did the captain first hesitate in letting the boy risk climbing the tree?为什么上尉一开始犹豫让那个男孩冒险爬树？

⑥在一些由序数词构成的固定词组里不用定冠词。at first 开始 first of al1首先 from first to last自始至终

3、数词的复数形式

基数词和序数词一般都以单数形式出现，但在下面几种情况下却要用复数：（1）表示几十岁时

“二十多岁”说twenties，表示的是20岁到29岁。依次类推，thirties表示“三十几岁”，forties表示“四十几岁”，但“十几岁”不可说tens，而要说teens，指13岁至19岁。The hero of the story is an artist in his thirties.故事的主人翁是一位三十多岁的艺术家。（2）表示几十年代时

“二十世纪八十年代”写成1980s或1980’s，均读作nineteen eighties，指的是1980至1989年这十年间，需注意的是，年代用代字表示时则不可用-'s形式。History has entered the eighties.历史进入到八十年代。（3）表示不确定数目时

这时要在million，thousand，hundred等词后加上-s并与of连用，表示大约多至“数以……计”，但millions of等前不能再加基数词，却可加some，several等表示不确定数目的修饰语。

Millions of other stars are even bigger and brighter than the sun.数以百万计的星球甚至比太阳还大还亮。（4）在分数中

当基数词(表示分子)大于one时，序数词(表示分母)要用复数，两者之间用不用连字符号均可。

Two thirds of the teachers in our school are women.我们学校三分之二的老师是女的。（5）当基数词用作可数名词或用于某些固定词组中时，也要用复数。How many sevens are there in forty-nine?49是由几个七组成？ Wait a minute.I’ll be finished in two twos.请等一下，我马上就来。

四、分数词、小数、和百分数

1、分数

（1）分数的构成法

分子用基数词，分母用序数词；分子大于”1”时，分母加”s”（即序数词应变为复数）。1/3 one-third 1/4 one-fourth 2/5 two-fifths 另外还有下列构成法：

1/2 a(one)half 1/4 a quarter 3/4 three quarters one and a half 巧记分数：分子基数词，分母序数词，分子大于“1”，分母加“-s”。带分数莫着急，前加整数就可以。分母若是“2”和“4”，half、quarter可代替。（2）分数的功能

分数在句子中可用做主语、宾语、表语、定语、状语等。

A quarter of the students are girls.四分之一的学生是女生。（做主语）

The crop that year was only one half of the usual amount.那年的收成只是平常年景的一半。（作表语）

（3）作主语是谓语动词的数

表示几分之几(或百分之几)的人或物时，须在分数(或百分数)和人或物间加of。若充当主语，谓语动词的数须与of后的名词的数保持一致。

Sixty percent of her income was spent on clothes.她收入的60%花在了服装上。但当表示人口的几分之几(或百分之几)作主语时，谓语动词常用复数形式。

2、小数

（1）小数的表示和读法 小数用基数词表示，注意其读法

小数点读作point,零读作zero或naught。小数点后的数字按个位基数词依次读出。0.1(zero)point one 2.05 two point zero

（2）小数的功能 小数在句子中一般作定语 The rope is 1.8 metres long.绳子长1.8米。

3.百分数

（1）百分数的表示

百分数由基数词加percent表示。5% five percent 25% 25percent(2)百分数的功能

在句子中可做主语、宾格、表语、定、状语等。作状语时，常与by连用。

More than 70 percent of the surface of the earth is covered by water.百分之七十多的地球表面被水覆盖着。

五、基数词、序数词的其他应用。

1、年、月、日表达法（1）年代表达法

年代用基数词表示，时间前用介词in。

221BC two hundred and twenty-one BC/two twenty-one BC.注意：年代后不用year，但可放在数词前

in the year 1979一九七九年 the twenties,20s二十年代 in one's twenties某人二十多岁（2）月份表达法

月份前用in，月份名称第一个字母须大写。in January(in Jan.)in May.in September(in Sept.)in December(in Dec.)（3）日期表达法

用序数词表示，前面加the，在某日前用介词on。on the first 在一日 on the thirtieth在三十日（4）某年某月某日表达法

in October,1949 一九四九年七月 on October 1,1949一九四九年七月一日 May 1(st)(May the first)五月一日 Mar.5(th)(March the fifth)三月五日

2、时刻表达法 时刻用基数词表示。

时间巧说：数字说法时后分，quarter,half不可用。如果出现past,to，分钟在前记心中。past过，差几分to，分钟小于三十分。（1）表示“几点钟”

用“整点数+o’clock(可省略)”。

8：00 eight(o'clock)12：00 twelve(o'clock)（2）表示“几点过几分” 在半小时之内

表示“几点过几分”，而分钟数又在半小时之内（包括半小时）可用”分钟数+past/after(美)+钟点数”。

8：15 a quarter past/after eight 8：20 twenty past eight 8：30 half past eight（3）表示”差几分几点”，而且不超过半小时

表示“差几分几点”，而且不超过半小时，可用”分钟数+to/of(美)+钟点数”。10：45 a quarter to /of eleven 11：55 five to /of twelve 注意：表示在某时用介词at，任何时刻均可直接按数字顺序读，8：05 eight five等。We begin classes at eight.我们八点开始上课。

3、倍数表达法（1）倍数+ as...as 倍数+as...as（意为“A是B的几倍”，多用于对客观事物的比较。）Asia is four times as large as Europe.亚洲有欧洲的四倍大。

This dictionary is twice as heavy as that one.这本字典有那本字典的两倍重。（2）倍数+比较级形式+than 倍数+（形容词/副词）比较级形式+than，意为“增加（多）几倍”。

This type of car uses three times more petrol than that type does.这种汽车比那种汽车的耗油多三倍。

The house is twice larger than that one.这间房子比那间大两倍。（3）倍数+ the size of 倍数+ the size/length/depth of...意为”是…几倍大/长/深”。

The earth is 49 times the size of the moon.地球的大小是月球的四十九倍。Shanghai is ten times the size of our hometown.上海有我们家乡的十倍大。（4）倍数+ that of 倍数+ that of...多用于生产、产量等方面的比较。

Their grain output is now 3.5 times that of 1980.他们的粮食产量是1980年的3.5倍。

4、基数词与序数词连用时

基数词与序数词连用时，一般将序数词放在基数词前面；当用基数词构成复合形容词时，其后的名词要用单数形式。

The first three parts need to be revised.前三部分需要修订。a six-year-old girl一个六岁女孩

a five-hundred-word composition一篇五百字的作代

六、加减乘除的表示法

1、加法的表达法

如表达“几加几是多少”，可用“What/How much is+基数词＋and/plus+基数词？”；如表达“几加几等于几”，可用“基数词＋and+基数词＋is＋基数词”。What/How much is seven and eight?7加8是多少？ Seven and eight is fifteen.7加8等于15。

2、减法的表达法

如表达“几减几是多少”，可用“What/How much is+基数词＋minus+基数词？”；如表达“几减几等于几”，可用“基数词＋minus+基数词＋is＋基数词”。What/How much is seven minus eight?7减8是多少？ Twenty-three minus eight is fifteen.23减8等于15。

3、乘法的表达法

如表达“几乘几是多少”，可用“What/How much is+基数词＋times+基数词？”；如表达“几乘几等于几”，可用“基数词＋times+基数词＋is＋基数词”。What/How much is seven times eight?7乘8是多少？ 5 times 8 is 40.5×8=40

4、除法的表达法

如表达“几除以几是多少”，可用“What/How much is+基数词＋divided by+基数词？”；如表达“几除以几等于几”，可用“基数词＋divided by+基数词＋is＋基数词”。20 divided by 4 is 5.20÷4=5 What/How much is 64 divided by eight?64除以8是多少？

七,数词记忆技巧

1.巧记100内的基数词：

十二以内词各异，十三数到十九去，后加-teen莫忘记；

二十、三十……至九十，整十之后有-ty；

要说“几十几”，中间“-”号别丢弃，hundred是“一百”，请你记住莫大意。2.巧记读数：从右向左三逗开，一逗千，二逗百万，三逗就是十万万；左右三位分开读，保你又快又喜欢。注：逗指逗号。

3.巧用hundred等：hundred，thousand和million，有时含糊有时清。清时无s和of，糊时s和of跟。

4.巧记基数词变序数词：基变序，很容易，结尾加上“th”。一二三特殊记，结尾各是t、d、d。八减t，九去e，f来把ve替，y改为“ie”，结尾仍有“th”。若是遇到几十几，只变个位就可以。

5.巧记分数：分子基数词，分母序数词，分子大于“1”，分母加“-s”。带分数莫着急，前加整数就可以。分母若是“2”和“4”，half、quarter可代替。

6.时间巧说：数字说法时后分，quarter,half不可用。如果出现past,to，分钟在前记心中。past过，差几分to，分钟小于三十分。