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专题四 数词
考点一 基数词和序数词的基本用法
1、基数词
（1）基数词的基本构成
1-9 11-19 整十 几十几
one eleven ten -------
two twelve twenty twenty-two
three thirteen thirty thirty-three
four fourteen forty forty-four
five fifteen fifty fifty-five
six sixteen sixty sixty-six
seven seventeen seventy seventy-seven
eight eighteen eighty eighty-eight
night nineteen ninety ninety-nine
注意：
（1）基数词1-12是独立词，需逐个记忆。
（2）基数词13-19是在个位数词的词干后加-teen构成，其中thirteen,fifteen,eighteen 变化不规则。 21cnjy.com
（3）基数词20-90的数十数除twenty,thirty,forty, fifty, eighty为特殊形式外是在个们数词后面加-ty构成。基数词21-99的里非整十数是在十位数词后面加上个位数词构成，中间加上连字符“-”。如21 twenty-one.
(2）基数词的读法
1. 在读三位数或三位数以上的基数词时，需在十位数之前(若十位数是“0”，在个位数）加连词and .
304 ----- three hundred and four
1,342----- one thousand three hundred and forty -two 21·cn·jy·com
2. 阿拉伯数字每三位数就需用一个逗号隔开，从后往前数；所用的英语单词为:thousand (千），million (百万），billion(十亿），英语中没有“万”和“亿”，在表示“ 万”和“亿”时要按十进位法来推算。
1万可用10千来表示，即10,000
100,000,000可写成 a hundred million .
35,845可写成 thirty-five thousand eight hundred and forty-five
(3）基数词的基本用法
基本概念 基本用法 例句
基数词（表示事物数量） 从句子成分上分析，基数词在句中可用作主语、宾语、表语等。 Four of them went to the factory . 他们中的4个人去了工厂。（主语）I want two . 我想要两个。 （宾语）My classmate is eighteen . 我的同班同学18岁了。(表语）
表示“年、有、日”的时间 The accident happened on Many 5, 2011.
表示编号 Today we are going to study Lesson Five. 今天我们要学习第5课。 He lives in Room 801. 他住在801房间。
表示时间几点钟，几点过几分 It’s two o’clock . 现在是两点钟。
用于四则运算 One plus two is three. 1加2等于3. Five times six is thirty . 5乘6等天30.
表示百分数 Thirty percent of them is water . 它们当中的30％是水。
（4） hundred, thousand , million 与billion的用法。
1. 与具体数词one, two , two ....或several , some , many等连用时，要用单数形式。 21世纪教育网版权所有
Five hundred people 500人。
two thousand books 20000本书。
many million trees 几百万棵树。
2与of连用时，要用复数形式，但前面不再加数词。
hundreds of people 成百上千的人
thousands of factories 成千上万的工厂
millions of birds 数以百万计的鸟儿
hundreds of trees 几百棵树
2、序数词
(1）序数词的基本构成
第一至第十 第十一至第二十 第二十一至第三十 第整十至第一百
first eleventh twenty-first ------
second twelfth twenty-second ------
third thirteenth twenty-third ------
fourth fourteenth twenty-fourth fortieth
fifth fifteenth twenty-fifth fiftieth
sixth sixteenth twenty-sixth sixtieth
seventh seventeenth twenty-seventh seventieth
eighth eighteenth twenty=eighth eightieth
ninth nineteenth twenty-ninth ninetieth
tenth twentieth thirtieth hundredth
注意：
（1）从第一到第十九的序数词除第一first,第二second , 第三third,第五fifth,第八eighth,第九ninth,第十二twelfth变化不规则外，其余均在基数词后加上th . 21·世纪*教育网
（2）从第二到第第九十整十数字的序数词的构成方法是将整十数字词尾的y变成i再加eth .
（3）从第二十一到第九十九表示几十几的序数词，只是把个位数变成序数词，十位数不变。
基数词变序数词助记歌：
基变序，有规律，末尾加上th;
1、二、三特殊记，词尾分别t,d,d (first , second , third )
八加h, 九去e, ve要用f 替；
以y 结尾变ie , 后跟th 莫忘记。
若想表示几十几，只变个们就可以。
（2）序数词的基本用法
基本概念 基本用法 例句
序数词（表示数目的顺序或事物的位置） 表示编号 Mary sits in the second row. 玛丽坐在第二排。
表示日期 It happened on October the third , 1985.这件事发生在1985年10月3日。
主要用作定语、表语、前面要加定冠词the The fifth lesson is very easy to learn 第5课很容易学。 You are the first one I believe. 你是我最相信的人。
考点二 数词常见表达法
1. 年代的表达法
In the 1930’s / 1930s (in the thirties of the twentieth century 或in the nineteen thirties ) 在20世纪30年代
www.21-cn-jy.com
In the 1860’s/ 1860s (in the sixties of the 19th century 或in the eighteen sixties )在19世纪60年代2·1·c·n·j·y
2 日期的表达法
1988年5月1日可以写作May 1(st ) , 1988, 读作May the first , nineteen eighty-eight ; 也可以写作1(st) May , 1988, 读作the first of May , nineteen eighty-eight 【来源：21·世纪·教育·网】
1949 读作nineteen hundred and forty -nine 或nineteen forty-nine
1800读作eighteen hundred
1902读作nineteen hundred and two 或nineteen o two
3 分数的表达法
分数在英语中通常是借助基数词和序数来共同表达的。其中基数词表示分子，序数词表示分母。当分子大于1时，分母要用复数形式。
one third 三分之一 two thirds 三分之二
a /one quarter 四分之一（当分子为1时，可以用a )
Three and one fourth 三又四分之一
4 小数的表达法
小数用基数词来表示，以小数点为界，小数点左边的数字为一个单位，表示整数，数字合起来读；小数点右边的数字为一个单位，数字分开来读；小数点读作point , 0读作zero或o; 整数部分为零时，可以省略不读。 www-2-1-cnjy-com
0.4 zero point four 或point four 零点四10.23 ten point two three
25.67 twenty-five point six seven 二十五点六七
1.03 one point to three 一点零
5 百分数的表达法
百分数用基数词+percent 表示
0.68％ zero point six eight percent
6％ six percent
6 倍数的表达法
表示两倍用twice , 表示三或三以上的倍数用基数词。
The room is twice as large as that one .
这个房间是那个房间的两倍大。
This tree is three times as tall as that one .
这棵树是那棵树的三倍高。
易混易错
1、“in one’s +整十基数词的复数形式“
“in one’s +整十基数词的复数形式”表示“在某人几十岁时”。
如：in his seventies 在他70多岁时
在“in one’s +整十基数词的复数形式”中有时在one’s 后面可加上形容词early 或late 使其含义更确切。 2-1-c-n-j-y
The young man is in his early thirties .
这个年轻的男人30岁出头。
2、时刻表示法中的易混之处
如果要表达“几点过几分”或“差几分到几点”有两种表达法“
1. 只需要基数词，先说小时，后说分钟。
8：42 eight forty-two 8点42分；2：13 two thirteen 2点13分
2. 用基数词加介词，先说分钟数，后说点钟数。 分钟数没有超过30分的，介词用past，意为“几点过几分”；分钟数超过30分的，介词要用to ，意为“差几分到几点（未来的点钟数）”。 【来源：21cnj*y.co*m】
3；25 twenty-five past three 3点25分 5:45 fifteen to six 差一
刻到6点
3、表示编号时的易混之处
1、用基数词来表示编号时，应放在名词之后，且不需要任何冠词（但通常名词第一个字母要在写）
2、用序数词来表示编号时，应放在名词之前，且前面需加定冠词the
第十课 the tenth lesson ; 第二行 the second line
4、数词和冠词的关系
1、序数词前要加定冠词the ; 但基数词前不加冠词。
Sunday is the first day of a week .
星期天是一周的第一天。
2、a/an+序数词，表示“又一，再一”
He failed twice , but he tried a third time .
3. of the +基数词，表示范围。
She is the most beautiful girl of the three .
她是这三个女孩中最漂亮的那个。
Jim is the taller of the two .
吉姆是这俩个人中个子较高的那个。
4、序数词前已有指示代词、物主代词或every时，不用定冠词。
This is my first club to Hong Kong .
这是我第一次到香港旅行。
My second bike was stolen again
我的第二辆自行车又被盗了。
5、在一些由序数词构成的固定词组中不用定冠词。
at first 起先
From first to last 自始至终，从头到尾
first of all 首先
second to none 首屈一指的，最佳的
5、数词的读法
从后往前数，第三位加一个逗号；第一个逗号前读thousand 第二个逗号前读million , 第三个逗号前读billion . 年份的读法是两位两位地读。
6、基数词与单数名词用连字符连接构成复合形容词，作名词的定语。
a 100-meter race 一场百米赛跑
a ten-minute walk 步行10分钟的路程
7、几个半的表达法
基数词+and +a half +名词复数=基数词+名词（单数/复数）+and +a half
two and a half hours = two hours and a half 两个半小时
8、与another , more 连用时，表示在已有的基础上再增加一定的数量，其结构为“another+基数词”或“基数词+more 21教育网
My father will stay in Beijing for another two weeks . 21*cnjy*com
我爸爸将在北京再待两周。
I need two more chairs .
我还需要两把椅子。
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专题 数词题组
1. Today is Jack’s birthday . He is ______ years old now .
A fourteenth B. fourteen C. the fourteenth D. the fourteen
2. -----How do you keep fit
-----I live on ______ floor . I walk upstairs instead of taking the lift every day . 【来源：21·世纪·教育·网】
A twelve B. the twelve C. the twelfth
3. -----How old is your daughter
------ _______ . We had a special party for her _____ birthday yesterday . 21*cnjy*com
A Nine ; nine B. Nine ; ninth C. Ninth; ninth D. Ninth ; nine
4. Li Ming will be ______ . His parents are going to have a party for his _____ birthday . 【版权所有：21教育】
A sixteen ; sixteenth B. sixteenth ; sixteenth 21教育名师原创作品
C sixteen ; sixteen D. sixteenth ; sixteen
5. Meimei is going to be an older sister . Her parents are planning to have their _____ child . 2-1-c-n-j-y
A one B. two C. first D. second .
6. ----What are you going to do this Saturday
----I am going to the old people’s home to celebrate Mrs . Green’s _____ birthday . 21*cnjy*com
A ninty-ninth B. ninety-ninth C. ninety-nineth
7. -----Where were you born , Michael
---- I was born in a small village with only three ______ people .
A hundred B. hundreds C. hundreds of
8. Helen loves reading . She has read ______ books this month .
A five B. fifth C. five of D. fifth of
9 It’s my _____ time to come to the bookstore this month because most of the books in it are my favorite . 2·1·c·n·j·y
A forth B. four C. fourth
10. ----I am going to take this summer holiday in Taiwan .
-----Oh, really Taiwan is _____ a beautiful island that _____ people in Guangdong to to visit it every year.
A so ; thousands B. so ; thousands of
C such ; many thousands D. such ; thousands of
11. _______ month of the year is May .
A Two B. The second C. Five D. The fifth
12. On June 2nd this year , ____ people celebrated the Dragon Boat Festival near the Songhua River . To our joy , there was little rubbish left .
A thousands of B. thousand C. two thousands
13. Christmas Day is on _______ of December.
A twenty-five B. the twenty-five
C twenty-fifth D. the twenty-fifth
14. Doris lives on the _____ floor . It’s too high , so she has to take a lift every day . 21·世纪*教育网
A four B. fourth C. forty D. .fortieth
15. It is the boy’s _____ birthday today . He is five years old now .
A fifteen B. fifth C. five
16. -----What day is it today
----- It’s Monday , and it’s my ______ birthday . www-2-1-cnjy-com
A fifteen B. fifteenth C. the fifteen D. the fifteenth
17. Because of Project Hope , _____ children have better lives .
A thousand B. thousands C. thousand of D. thousands of
18. ______ Kobe’s fans watched his final match and _____ of them were men .
A Million of ; three fourths
B Three millions ; third four
C. Millions of ; three fourths
D. Three million ; third fours
19. Please turn to Page _____ and read the _____ story .
A Ten ; two B. Ten ; second C. Tenth ; second D. Tenth ; two
20. ----Jack , I want to go to _____ to see a dentist . Could you tell me the address
-----No problem .
A Room 606 B No. 2 Hospital C. Fifth Avenue
21. It’s never too old to learn . Karl Marx began to learn Russian in his _____. 【出处：21教育名师】
A the fiftieth B. fiftieth C. fifty D. fifties
22. ----How long is the bridge
---- It’s ______ .
A 300-meter-long B. 300-meters long
C 300 meters long D. 300 meter long
23 . They are the students of _______ .
A grade 7 B. Grade 7 C. 7th grade D Grad 7th
24. Unit ______ is easy but _____ unit is difficult .
A Sixth ; seven B. Six ; seven
C Sixth ; the seventh D. Six ; the seventh
25. According to a recent survey , about ______ of working mothers in China plan to have a second child .
A two-fifth B. two-five C. second-fifths D. two-fifths
26. In my hometown , the villagers built an _____ bridge in order to cross the river last year . 21世纪教育网版权所有
A 800 meter long B. 800 meters long
C 800-meter-long D. 800-meters-long
27. -----Welcome to Los Angeles . Have you ever been here
-----Sure . I visited this city three years ago so this is my _____ time here. 【来源：21cnj*y.co*m】
A first B. second C. third D. fourth
28. ______shouldn’t be allowed to go out with friends on weekends .
A Twelve-year-old B. Twelve-year-olds
C Twelve-years-old
29. ______ of the land in that area _____ covered with trees and grass .
A Two fifths ; is B. Two fifth; are
C Two fifth ; is D. Two fifths ; are
30. The _____ picture describes the changes in Tianjin over ______ years.
A nine; fifth B. nine; five C. ninth ; five D. ninth ; fifth
31. _____ volunteers will be needed for Project Hope in our city .
A Thousands B. Thousand of
C Three thousand D. Three thousands
32. -----How many bananas do we need for lunch , Mom
----- ______ . Two for the milk shake and three for the salad .
A Two B. Three C. Four D. Five
33. The number of the cars in the company is about eight ______ , and _____ of them are new cars . 21教育网
A hundred; two-thirds B hundreds ; two-thirds
C hundred; two-third D. hundreds ; two-third
34. Father’s Day is on ____ Sunday of June .
A three B. the three C. third D. the third
35. This is Mr. White’s ____ visit to Beijing . He has been there twice before . 21·cn·jy·com
A two B. second C. three D. third
36. Yesterday ______ people came to the town to watch the car race .
A hundreds B. hundred C. hundreds of D hundred of
37. Tree Planting Day is in March , the _____ month of the year .
A three B. third C. five D. fifth
38. ----Mum , the beautiful card I made last night is just for your ______ birthday . 21cnjy.com
-----Oh, thank you , my dear !
A forty B. the fortieth C. fortieth D fourth
39. May is the ______ month of a year .
A fifty B. fifteen C. fifth D. five
40. -----I hear your friend is visiting Sanya again . Is it the second time for him www.21-cn-jy.com
----Yes , and he will come for ______ time next spring .
A a third B. a second C. the third
答案
1-5 BCBAD 6-10 BAACD 11-15 DADDB 16-20 BDCBB 21-25 DCBDD 26-30 CDBAC 31-35 CDADD 36-40 CBCCA
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