一、基数词的构成
1．1-12的表述1-12各有各的形式，即one，two，three，four，five，six，seven，eight，nine，ten，eleven，twelve。
2．13-19的表述13-19的数字皆以-teen[ti：n]结尾，其中，fourteen，sixteen，seventeen，eighteen和nineteen分别由four，six，seven，eight，nine加后缀-teen变成的，eighteen中只保留一个t。thirteen，fifteen分别由three和five转花而来。
3．20-90数字的表达20-90的数字皆以-ty结尾，其中，sixty，seventy，eighty，ninety分别由six,seven,eight和nine加后缀—ty构成，eighty中只保留一个t。其他同上。
4．20-99之间的数字的表达20-99之间的数词须在十位和个位之间加连字符“-”，如twenty-five。
5．百位以上的数字的表达以及读在表达百位以上的数字时，必须在百位，十位和个位之间加and，在读音时也应读上and，如：104可表达为one hundred and four，486读作four hundred and eighty-six。
6．“万”的表达.英语中没有万和亿单词，只有百（hundred），千（thousand），百万（million），十亿（billion）。英语中表示“万”时，用10千。如：forty thousand四万。表示“亿”时需用百万来表示。如：two hundred million两亿。
7．，000以上的数字，从后向前数。每三位数加“，”。第一个“，”前为thousand,
第二个“，”前为million,第三个“，”前为,333,333,333读为three
billion,three hundred and thirty-three
million, three hundred and thirty-three
thousand,three
hundred and thirty ,thousand,million 前有若有具体数字时，要用单数形式，但如果他们后面有of ,则要用复数形式。同时，前面不能再加具体的数目。
二、基数词的用法
(1) 基数词在句中主要用作主语、宾语、定语、表语、同位语，例如
：
Thirty of them are Party members.
（
主
语） --- How many would you like？ --- Three ，please．（作宾语）
The nine boys are from Tianjin.（定语） Six plus four is ten.（表语）
We four will go with you.（同位语）
(2) 表示一个具体数字时，hundred, thousand, million不用复数；表示一个不确定数字时则用复数。例如：
Our country has a population of 1,300 million people. There are three thousand students in our school.
After the war, thousands of people became homeless.
Maize is the most important food crop for millions of people in the world. They arrived in twos and threes．
(3) 表示“……十”的数词的复数形式可用来表示人的岁数或年代， 例如：
He is in his early thirties． He died still in his forties． This took place in 1930s
．
(4)
表
示
时
刻
用
基
数
词
。
例
如
：
We get up at six. The workers begin work at eight. 表示“几点过几分
，用past,但须在半小时以内。例如：ten past ten, a quarter past nine, 表示“几点差几分用to, 但分数须在半小时以上。例如：twenty to nine a quarter to ten 表示―几点几分 用基数词。例如：seven fifteen, eleven thirty, nine twenty
序数词的构成及用法
一、序数词的构成
1 第一，第二，第三分别为first,second,third.
2 第四到第十九都有相应的基数词加the构成，有几个特殊，即fifth,eighth,ninth,twelfth. 3 第几十把y改为 i加eth.. twentieth,ninetieth
4 序数词之前要加定冠词或代词。但序数词表名词时，可不用冠词。Who won first? 序数词表“再一”，“又一”时不用定冠词，只需在前面加
a He failed once .Then he tried a second time.
5序数词的缩写形式是在数字后面直接加上序数词最后两个字母构成。1st,2nd,3rd,4th,21st,22nd,34th……
6 100以上的序数词的表示方法 第100为100th (读作 one hundredth),101st 读作one hundred and first,其他的依次类推
二. 序数词的用法
（1）序数词主要用作定语，前面要加定冠词ｔｈｅ， 例如：
The first truck is carrying a foot baskets． John lives on the fifteenth floor．
（2）序数词有时前面可加不定冠词a来表示再，又这样的意思， 例如：
We'll have to do it a second time． Shall I ask him a third time？ When I sat down，a fourth man rose to speak．
（3）注意不规则形式：
one---first, two---second, three---third, five---fifth, eight---eighth, nine---ninth, twelve---twelfth。 （4）表示年，月，日时， 年用基数词表示，日用序数词表示。 例如：
1949年十月一日读作: October (the) first, nineteen sixty
2004年九月十日读作：September (the) tenth, two thousand and four
（5）表示分数时，分子用基数词表示，分母用序数词表示。分子大于1时，分母加-s。 例如： three fourths, one second, two fifths
（6）序数词缩写形式：
first→1st second→2nd third→3rd fourth→4th twenty-second→22nd
分数的表示法
1 分数的表示法：分子用基数词，分母用序数词，当分子大与一时，分母用复数形式。 2|3 two thirds 3|5 three fifths
2 整数与分数之间用and 连接。 One /an hour and a half 3 分数的用法结构为“分数+of+the+名词”表示“。。。。的几分之几”，当其作主语时，谓语动词的单复数取决于短语中名词的复数
1.About ________ students in our class can describe that place in English.
2.A. three-fifths B. three-fifth C. third-five D. third-fifths 2. Nine _______ pounds a week?
That’s very good.
A. hundred of B. hundreds of C. hundreds D. hund
red
3. We often have sports after class, and I like to play _______ basketball.
A. a B. an C. the D. 不填
【中考演练】 一. .单项填空
1. This morning I had ________ egg and a bottle of milk for my breakfast.
A. an B. a C. the D./
2. ---What’s the matter with you?
---I caught ________ bad cold and had to stay in ________.
A. a;/ B. a; the C. a; a D. the; the
3. ---Have you seen _______ pen? I left it here this morning. ---Is it ________ black one?
I think I saw it somewhere.
A. a; the B. the; the C. the; a D. a; a
4. _______ sun is shining brightly. A. A B. An C. The D. /
5. There is _______ “h” in the word hour. A. a B. the C. an D./
6. Did you enjoy your stay in Xian? Yes. I had _______ wonderful time.
A. a B. an C. the D. /
7. ______ sun is bigger than _______ earth.
A. A; the B. A; an C. The; an D. The; the
8. There is _______ apple and some pears on the table. A. the B./ C. a D. an
9. David has _______ cat. It’s very nice. A. a B. an C. the D./
10.I’m reading _______ novel. It is _______ interesting story.
A. a; an B. a; a C. the; the D. /; an
11. It is said that SARS has killed more than ________ people worldwide.
A. three hundreds B. three hundredss D. three hundred
’ C. three hundred’
12. ---How many workers are there in your factory?
---There are two __________.
A. hundreds B. hundred C. hundred of D. hundreds of
13. ---Which is the smallest number of the four? ---_______________.
A. Two-thirds B. A half C. A quarter D. Three-fourths
14. ---What do you think of a war, Li Ming?
---I’veno idea. But it’s a fact that _______ people had to leave their hometown during the War on Iraq.
A. three thousands B. thousand of
C. thousands of D. several thousands
15. We all think that the _______ century will bring us more hopes. A. twenty-first B. twentieth-first C. twenty-one D. twentieth-one
16. ---Can you write the number eighty-five thousand, six hundred and twenty-six? ---Yes, it is __________.
A. 856620 B. 85626 C. 58662 D. 58626
17. When was the PRC founded? It was founded on _________.
A. July 1, 1921 B. October 1, 1949 C. August 1, 1927 D. May 1, 1922
18. I was 8 years old when my father was 31. This year my father is twice my age. How old am I?
A. 21 B. 22 C. 23 D. 24
19. _______ Chinese are looking for ways to learn English well before Beijing 2008 Olympics. A. Thousand B. Thousands C. Thousand of D. Thousands of
20.Both of the two rulers are broken. I want to buy a _______one.
A. three B. third C. forth D. /
数词跟踪练习
1. There are _____ days in a year.
A. three hundreds and sixty-five
B. three hundred and sixty five
C. three hundred and sixty-five
D. three hundreds and sixty-five
volunteers sent _________ books to a mountain village school on Children’s Day.
A. two hundreds of B. two hundred of
C. two hundreds D. two hundred
went to college in ______ and began to work in _______.
A. the 1990s; twenty
B. the 1980s, twentieth
C. 1980; my twenties
D. 1980s, my twenties
Hepburn passed away peacefully in her________ (sixty).
5. The earthquake happened on the ____________(20) of April.
6. December is the _______(twelve) month of a year.
had a big family celebration on my grandpa’s ________(ninety)birthday.
8. On January 9th this year, London Underground celebrate its
_______________(one hundred and fifty) birthday.
thirds of the water_____(be)polluted.
thirds of students _______(like)football.
11. About ____of the students in Grade Nine this year were born in the_____.
A. three five; 1996. B. three fifths; 1990s
C. third fifth; 1997. D. third fifths; 1990s
12. There are days, in a week and Tuesday is _______ day of' the week.
A. seven ,third B. seven ,the third
C. seventh ,three D. the seventh, three
13. Please turn to Page ______ and look at the __________ picture in this unit.
A. twentieth; one B. Twenty; one
C. twentieth; first D. Twenty; first
14. --- How was your weekend?
---- Great! It was my grandfather’s _______ birthday. We enjoyed ourselves.
A. seventy B. seventieth
C. the seventieth D. seventeenth
15. The chairperson received about three ______ applications to join the Bird watching Club.
B. hundreds of
C. hundred of D. hundreds
16. He wrote his ______ novel when he was ______.
A. five; fifties B. fifth; fifty
C. fifth; fiftieth
17. ________ visitors come to Xingyi during May Day holidays every year.
A. Thousands of B. Two thousands
C. Thousand of D. Thousand
18. About ____of the students in Grade Nine this year were born in the_____.
A. three five; 1996. B. three fifths; 1990s
C. third fifth; 1997. D. third fifths; 1990s
用所给词的适当形式填空
1．They live on the ________(five) floor.
2．On my sister's _______(nine) birthday, I gave her a useful book.
3．__________ (hundred) of people come here to read books on weekends.
4．About two ________(thousand) trees have been planted along the river.
5. Three ________ (four) of the students in our class like basketball.
6．Father's Day is on the ________(three) Sunday of June.
7．They live on the _______________ (twentysix) floor of the tall building.
8．In the ________ (eight) picture, you can see many young trees.
9．He left his parents when he was ________ (seven) years old.
10．It's the ________ (thirty) song that he has written.
11．My ________ (one) name is Linda. What about yours?
12．She became very famous in her ________ (forty)．
13. Three quarters of fruit juice ________(eat) by him just now.
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