|
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 |
|
nine |
nineteen |
ninety |
ninety-nine |
注意：
(1)基数词1-12是独立单词，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。
(3)基数词20-90的整十数除twenty,thirty,forty,fifty, eighty为特殊形式外是在个位数词后面加-ty构成。基数词21-99的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”，在个位前）加连词and。
304-three hundred and four
1,342-one thousand,three hundred and forty-two
(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
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、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 My classmate is eighteen. 我的同班同学18岁了。（表语） |
|
表示“年、月、日”的时间 |
The accident happened on May |
|
|
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乘以6等于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…或several,some,many等车用时，要用单数形式。
five hundred people 500人
two thousand books 2,000本书
many million trees几百万棵树
(2)与of连用时，要用复数形式，但前面不能再加数词。
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
二、序数词的构成
1.序数词的基本构成
序数词一般是以与之相应的基数词尾加-th构成，例如 fourth, tenth,但以下的这些基数词变为序数词时， 有特别之处。
1.one--- first, two --- second, three --- third, five --- fifth, nice --- ninth, twelve --- twelfth
2. 以ty 结尾的单词， 要先变y为I, 在加-eth. 例如：thirty ---thirtieth, fifty ---fiftieth
3. 以one, two, three 等结尾的多位数词， 要将各位数变成序数词。 例如： twenty-one --- twenty-first, one hundred and one --- one hundred and first
注意： 序数词前常用定冠词， 有时还可以用不定冠词 a/an 则表示 “又一 ”的意思。
例如：Mr Brown has a second car. 布朗先生另外还有一辆车。
He has tried a second time. 他又尝试了一次。
三、数词的应用
1．时刻的表示：小时、点钟、分钟、秒钟要用基数词。
①“几点钟”用基数词加o'clock。o'clock可省略。如： 5点钟—five（o'clock）．
②“几点过几分 ”，≤30分钟”用介词past。如： 7：05—five past seven；7：15—fifteen （a quarter）past seven；7：30—half past seven。
③“差几分几点”用介词“to”。如：7：40—twenty to eight；7：45—fifteen（a quarter to eight。
④日常生活中的时间读法常常简化，直接按基数词的顺序读。如：7：05—seven o five；7：15— seven fifteen。
2．年月日的表示：
① 年份用基数词，如：1999年—nineteen ninety-nine； 1900年—nineteen hundred； 2000—two thousand；1905—nineteen o five；
② 年用基数词，日用序数词。如：1998年6月8日 写作：June 8，1998；读作：June the eighth， nineteen ninety-eight或the eighth of June， nineteen ninety-eight。
3. 世纪、年代表示法：
（在）90年代 (in) the nineties
（在）19世纪 (in) the nineteenth century
（在）18世纪30年代 (in) 1730s或1730’s
4．编号的表示：
① Lesson One ＝the first lesson第一课；
② Bus No．3＝the No．3bus 3路公共汽车；
③ 表示住所时不用“No．”如：302房间—Room 302（读作：room three o two）；
④ 如果编号的数词比较长，一般用基数词。如：Page 457第457页；
⑤ 电话号码，用基数词,如：3855633—three eight five five（double five） six three three（double three）。
5．分数的表达：
分子用基数词，分母用序数词，分子大于“1”，分母则加“s”。如：1／3 one third，2／3two thirds；
另外：1／2 a（one）half; 1／4one fourth或a（one）quarter;3／4threefourths或three quarters。
half a second; a quarter of a second四分之一秒
6. 表示有小数的词用基数词。
5.5 five point five
12.135 twelve point one three five
7．表示百分数
5℅：five percent (per cent)， 0.8℅ zero point eight percent (per cent).
8．表示有小数的词用基数词。
5.5 five point five
12.135 twelve point one three five
9．其他用法：
1）基数词＋单数名词＋形容词构成合成形容词。如：一个五岁的男孩a five-year-old boy；
一座800米长的桥an 800-metre-long bridge；女子400米接力girls'400-metre relay race。
2）具体数词＋metre（s）／kilometre（s）／kilo（s）long ／ high ／tall ／deep ／away等。如：长江长6300公里。The Changjiang River is 6，300 kilometres long．
3）表示"几十岁"用序数词，eg. 在他三十几岁时 in his thirties
4）倍数的表达：(一倍用once，两倍用 twice，两倍以上用基数词＋times。如：5倍five times)。
例如：He is as tall a boy as I.
He is a head taller than I .
He is two years older than I
China is four times as large as Europe.
I am twice as old as you. (=I am twice older than you. /I am twice the age of you.)
My books are twice as many as yours.
China is four times larger than Europe.(=China is four times the size of Europe.)
I pay twice as much as it was worth.
I pay twice as much for the house.
例题解析：举一反三，学的更轻松！
1. _______ Chinese are looking for ways to learn English well before Beijing 2008 Olympic.
A. Thousand B. Thousands C. Thousand of D. Thousands of
2. Both of the rules are broken. I want to buy a ______ one.
A. three B. third C. forth D. /
3). --- Which is the smallest number of the four? --- _________.
A. Two- thirds B. A half C. A quarter D. Three-fourths
4). Please write down the new words in the text of _______.
A. Lesson Eleven B. the Lesson Eleven C. Lesson Eleventh
解析：1.基数词hundred, thousand, million, billion 等前有具体数字时，它们后面不能加s,若这些词后面有介词of (几百，成百上千) ，thousands of (几千，数千个)，millions of, billions of 前不可用数词修饰。但可用many, some, several 等修饰。故选答案D.
2．答案： B。此题主要考查序数词的运用。
3．答案：C。此题主要考查英语中的分数表示法。英语中表示分数时，分母用序数词，分子用基数词，当分子大于1时，表示分母的序数词后要加s.
4．答案： A。 此题主要考查基数词的编号。在通常情况下，名词编号有这几种表示法： 1。事物名词+基数词，且每个单词的首字母都要大写。如：Lesson Eleven；2。定冠词+基数词+事物名词。如： No. 6 Middle School
练习与巩固：熟能生巧，取得好成绩！
选择填空：
1. _______ of people in the world are sending information by E-mail ever day.
A. Many million B. Several million C. Several millions D. Many millions
2. About _______ of the surface of the earth _______ covered with water.
A. three quarter, is B. three quarters, has C. three quarters, is D. three quarter, are
3. It will take _______ time to finish the work.
A. one and a half years’ B. a year and half C. one and a half year’s D. a year and half’s
4．--- How long will your stay here ?、
---For ________ .
A. one and two day’s B. one and two day C. a day or two D. one or two day
5．When he moved to Germany in ______ , he was already in _______ .
A. the fifties; his sixties B. fifties; his sixties
C. the fifties; his sixty D. fifty; sixty
6．My brother lives in ______ on ______ floor.
A. six Room ;second B. Room six ;the second
C. Room six; two floor D. the room six ; the second
7．December is _______ month of the year.
A. twelve B. twelfth C. the twelfth D. the twelve
8．This took place in the ______ .
A. 1940 B. 1940s C. 1940es D. 1940th
9．It is only _____ from my home to the train station.
A. ten minutes walk B. ten-minutes walk C. ten minutes ‘s walk D. ten minutes’ walk
10．There are ______ in this building , I live on ______.
A. nine floors ,the ninth floor B. nine floor, the ninth floor
C. nine floor , nine floors D.ninth floor,the ninth floor
11．The water behind the Three Gorges Dams (三峡大坝) should be ______ higher than downstream（ 下游）。
A. sixty-five meter B. sixty-fifth meter
C. sixty-five meters D. sixty-fifth meters
12. There are _______ days in a year.
A. three hundred sixty-five B. three hundred and sixty-five
C. three hundred and sixty –five D. two hundreds and sixty-five
13. ---How many teachers are there in your school?
--- __________. , but I'm not sure.
A. Hundreds B. Hundred C. Hundreds of D. One hundred
14. There are _________ doctors and nurses working hard in that hospital.
A. thousand B. two thousand C. two thousands D. two thousands of
15. --- What's one fourth and a half, do you know?
--- Yes, it's _________.
A. two sixths B. three fourths C. one three D. three sixth
16. Now children, turn to page ________ and look at the _______ picture in Lesson Two.
A. twentieth, one B. twenty, one C. twentieth, first D. twenty, first
17. Both of the two rulers are broken. I want to buy a _______ one.
A. three B. third C. forth D. /
18. December is the __________ month in year.
A. twenty B. twelve C. twentieth D. twelfth
19. --- What is the date today?
--- It's _________.
A. Thursday B. June the sixteenth C. the best day D. June fifteen
20. She knows a lot about China as she has been to China ________.
A. for the forth time B. four times C. a fourth time D. for four times
1-5 CCACA 6-10 BCBDA 11-15 CCCDA 16 –20 DBDBB
获得更多试题及答案，欢迎联系微信公众号：ygjjcom
客服微信号：ygjjcom