1、1数词的讲解与应用（1）数词表示数目多少或顺序多少的词叫数词。（2）数词的分类 (一) 基数词在英语中表示数目的词称为基数词。1.基数词的构成(1)1-20 one, two, three, four, five, six, seven, eight, nine, ten, eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty(2)21-99先说“几十”, 再说“几”,中间加连字符23twenty-three,34thirty-four,45forty five,56fifty-si
2、x, 67sixty-seven,78seventy-eight,89eighty-nine,91ninety-one(3)101999先说“几百”,再加 and,再加末两位数或末位数;586five hundred and eighty-six,803eight hundred and three(4) l,000以上,先从右往左数 ,每三位数加一个“,”,第一个“,”前为 thousand.第二个“,”前为 million,第三个“,”前为 billion(美式)或 thousand ,million(英式), 然后一节一节地表示。1,001one thousand and one9,78
3、5nine thousand, seven hundred and eighty-five18,423eighteen thousand, four hundred and twenty-three6,260,309six million two hundred and sixty thousand three hundred and nine750,000,000,000seven hundred and fifty billion(美式) seven hundred and fifty thousand million(英式) 2.基数词的用法(1)作主语e.g. Four Of them
4、 come from Paris.(2)作宾语e.g.一 How many books would you like?一 I would like two.(3)作表语e.g. Seven minus two is five.(4)作定语e.g. There are three people in my family(5)作同位语e.g. You two will go swimming with us.2(6)表具体数字时 ,hundred, thousand, million 用单数。e.g. There are six hundred students in our grade.(7)表
5、不确定的数字时,数词用复数。若带名词,再加 of hundreds of(数百,成百上千的),thousands of(数干,成千上万的),millions of( 数百万 )e.g, They arrived in two sand threes.他们三三两两地来了。(8)表示“十”的数词的复数可以表示人的岁数或年代。e.g. He is in his early thirties.他有三十来岁(31 34岁):This took place in the 1930s.这事发生在二十世纪三十年代 ;(9)表示时刻e.g. I watch CCTV News at seven oclock e
6、very evening.(二 )序数词在 英语中表示顺序、次序的词称为序数词。1,序数词的构成(1)一般在基数词后加 the.g. four fourth, thirteen thirteenth (2)不规则变化one first, two second, three third, five fifth,eight eighth, nine ninth, twelve-twelfth(3)以 y 结尾的十位整数,变 y 为 ie 再加 thtwenty twentieth, forty fortieth, ninety ninetieth(4)从二十一后的 “几十几 ”直至“几百几十几”或
7、“几千几百几十几”只将个位的基数词变为序数词。twenty-first, two hundred and forty-fifth2.序数词的用法(1)序数词作定语时 ,一般要与定冠词或物主代词连用。e.g. Tom is their second son.He is the first one to come here.(2)序数词有时可与不定冠词连用,表示数量上“ 又 “,“再一”e.g: He tried a second time.他又试了 次.Shall l ask him a third time?还要我再问他 次吗? 我已问了他两次)(3)序数词的缩写形式为:阿拉伯数字加上这个词的
8、末尾两个字母。1st 2nd,3rd,4th,20th,21st,22nd,23rd(4表示年、月、日时,年用基数词,日用序数词。2005年8月15日:(英)15,8,2005=15th,August,2005;(美)8,15,2005=August 15th,2005(三 )基数词和序数词都可以用来给数字编号。No.1(1号 ),No.3bus(3路公共汽车 ),Room 103,(103号旁间)The first lesson=Lesson One(第一课)(四 )分数词的表达分子用基数词,分母用序数词,分子大于1时,分母加 se.g.1/3-one third;2/5-two fifth
9、s3(五 )数学 运算的表达e.g.3+5=8 Three plus/and five is eight.9-2=7 Nine minus two is seven.6x5=30 Five times six is thirty /six unutilized five is thirty.82=4 Eight divided by two is four.(六）倍数表示法a. 主语 +谓语+倍数（或分数）+ as + adj. + asI have three times as many as you. 我有你三倍那么多。b. 主语+ 谓语+ 倍数（分数） + the size (amoun
10、t，length) ofThe earth is 49 times the size of the moon. 地球是月球的 49倍。c. 主语 +谓语+倍数（分数）+ 形容词（副词）比较级+ thanThe grain output is 8 percent higher this year than that of last year.今年比去年粮食产量增加8%。d. 还可以用 by+倍数，表示增加多少倍The production of grain has been increased by four times this year.今年粮食产量增加了4倍。（3）数词练习( )1. Wo
11、rk must come _.A. first B. at first C. the first D. in first( )2. The Peoples Republic of China was founded _.A. on October the first , 1949 B. in October the first, 1949C. on October one, 1949 D. on October first one, 1949( )3. There are _ days in a yearA. three hundreds and sixty-five B. three hun
12、dreds and fifty-sixC. three hundreds of sixty-five D. three hundred and sixty-five( )4. There are _ days in February.A. thirty B. thirty-one C. twenty-eight D. twenty-six( )5. The film begins at 4:15 . “4:15“ is _.A. four fifth B. fifteen four C. four fifteen D. a quarter to four( )6. _ is seventy-s
13、even.A. Forty and four B. Thirty-seven and forty C. Forty or thirty-seven( )7. It took me _ to finish my homework .A. two and a half hour B. two hour and a halfC. two hours and a half D. a half and tow hour( )8. -How many months are there in a year ? -There are _.A. eleven B. twelve C. twenty D. twe
14、lfth( )9. At the age of _, he was a worker.A. twenty B. the twenty C. twentieth D. twenty-first( )10. The Changjiang River is _ longest river in China.A. the first B. the second C. first D. one4( )11._ of the teachers in the school is 300, and _ of them are women teachers.A. The number ;first fourth
15、 B. A number ;ones secondC. A number; one second D. The number ;three quarters( )12. Mr. Green lives on _ floor.A. seven B. the seven C. the seventh D. seventh( )13. This is a big class , and _ of the students are girls.A. two third B. second three C. two thirds D. two three( )14. She has been to Ha
16、ngzhou _, so he knows it very well.A. for the four time B. four times C. a fourth time D. for four( )15. To our surprise, it was invented by a high school student of _.A. fifteen-years-old B. fifteen C. fifteen-year age D. age of fifteen( )16. What does he say about _ holiday ?A. Jims two months B.
17、Jims two-month C. Jim-two -month D. Jims-two-month( )17. The School Art Festival is held _.A. each two year B. every second years C. every two years D. each second years( )18. About _ of the workers in the clothes factory are women.A. third fifths B. third fifth C. three fifths D. three fifth( )19.
18、The story took place in _.A. the 1978 B. 1978s C. the year of 1978s D. the 1970s( )20. _ other stars are much bigger and brighter than the sun.A. Thousands of B. Thousand of C. The thousand of D. Thousands( )21.The government of Chongqing is building _ cheap and good houses for the people.A. thousan
19、d B. thousands C. thousand of D. thousands of ( )22. Now, everybody, please turn to Page _and look at the _ picture.A. Fifth; five B. Five; fifth C. Fifth; fifth D. Five; five( )23-Do you have enough students to clean the laboratory ?-No, I think we need _ students.A. another B. two others C. more two D. two more( )24. Well have a _ holiday. What about going to the West Lake?A. two days B. twoday C. twodays D. twodays( )25. -How many teachers are there in your school ?- _, but Im not sure.A. Hundreds B. Hundred C. Hundreds of D. One hundred
