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)1-20one,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23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six, 67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one(3)101—999先说“几百”,再加and,再加末两位数或末位数;586→five hundred and eighty-six,803→eight 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。
1,001→one thousand and one9,785→nine thousand, seven hundred and eighty-five18,423→eighteen thousand,four hundred and twenty-three6,260,309→six million two hundred and sixty thousand three hundred and nine750,000,000,000→seven hundred and fifty, billion(美式) seven hundred and fiftythousand million(英式)（5）月份、星期的单词一月 January 二月 February 三月 March 四月 April 五月 May 六月 June 七月 July 八月 August 九月September 十月 October 十一月 November 十二月DecemberMonday 星期一Tuesday 星期二Wednesday 星期三Thursday 星期四Friday 星期五Saturday 星期六Sunday2.基数词的用法(1)作主语e.g.Four Of them 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.(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 and 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 o’clock every evening.(二)序数词在英语中表示顺序、次序的词称为序数词。
1,序数词的构成表示顺序的数词称为序数词。
序数词一般以与之相应的基数词加词尾th构成；多个单词时，仅最后一个变为序数词。
序数词前一般需加“the”。
1．“基数词”变“序数词”的口诀：●基变序，有规律；一二三，特殊记，●八加h，九去e； Ve要f用替，●以y结尾变ie，后加-th莫忘记，●假如碰到几十几，只变个位就可以。
2．序数词作主语、宾语、表语、定语、同位语或状语。
She was the_fifth in the exam.(作表语)The first of June is Children's Day.(主语)3．表顺序时，基数词和序数词间可互换，如：Lesson Five＝the fifth lesson4.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.(3)序数词的缩写形式为:阿拉伯数字加上这个词的末尾两个字母。
1st 2nd,3rd,4th,20th,21st,22nd,23rd（三）数词应用●4、年代的读法为两位、两位地读。
整百的后读hundred，整千的后读thousand，前常加“the year”。
1937读作nineteen thirtyseven或：nineteen hundred and thirtyseven1900年读作nineteen hundred1905年读作nineteen and(或o)five或：nineteen hundred and five2000年读作the year two thousand●5、年、月、日的英语顺序为“月，日，年”。
“日”用序数词读和写(写时也可用基数词)；“日”读在“月”前时要加读“of”。
July 7(th)，2005 2005年7月7日读作：July the seventh two thousand and five 或the seventh ofJuly two thousand and fiveToday is Thursday，September 19th.今天星期四，9月19日。
●6、12小时制时刻的读法分为顺读法和倒读法。
顺读法是依次读“点钟数、分钟数”。
倒读法中，在前半小时：“分钟数＋past＋已过点钟数”；在后半小时：“分钟数＋to＋下个钟点数”。
半小时用“half”，一刻钟用quarter。
6：00读作：six(o'clock)7：30顺读：seven thirty 倒读：half past seven9：15顺读：nine fifteen 倒读：a quarter past nine2：45顺读：two fortyfive 倒读：a quarter to three21：50顺读：twentyone fifty倒读：ten to ten in the evening＝9：50p.m.24：00读作：twentyfour hundred hours＝midnightThe bus usually leaves at 19：15.公共汽车通常在19：15离开。
(读作a quarter past seven in the evening 或nineteen fifteen)数词练习( )1. Work must come ______.A. firstB. at firstC. the firstD. in first( )2. The People's Republic of China was founded _______.A. on October the first , 1949B. in October the first, 1949C. on October one, 1949D. on October first one, 1949( )3. There are _______ days in a yearA. three hundreds and sixty-fiveB. three hundreds and fifty-sixC. three hundreds of sixty-fiveD. three hundred and sixty-five( )4. There are ______ days in February.A. thirtyB. thirty-oneC. twenty-eightD. twenty-six ( )5. The film begins at 4:15 . "4:15" is _______.A. four fifthB. fifteen fourC. four fifteenD. a quarter to four( )6. _______ is seventy-seven.A. Forty and fourB. Thirty-seven and fortyC. Forty or thirty-seven( )7. It took me _____ to finish my homework .A. two and a half hourB. two hour and a halfC. two hours and a halfD. a half and tow hour( )8. ---How many months are there in a year ? ---There are _____.A. elevenB. twelveC. twentyD. twelfth( )9. At the age of _____, he was a worker.A. twentyB. the twentyC. twentiethD. twenty-first ( )10. The Changjiang River is ______ longest river in China.A. the firstB. the secondC. firstD. one( )11._______ of the teachers in the school is 300, and ______ of them are women teachers.A. The number ;first fourthB. A number ;one's secondC. A number; one secondD. The number ;three quarters ( )12. Mr Green lives on ______ floor.A. sevenB. the sevenC. the seventhD. 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 Hangzhou ______, 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-oldB. fifteenC. fifteen-year ageD. age of fifteen( )16. What does he say about ______ holiday ?A. Jim's two monthsB. Jim's two-monthC. Jim-two -monthD. Jim's-two-month( )17. The School Art Festival is held _______.A. each two yearB. every second yearsC. every two yearsD. each second years( )18. About ______ of the workers in the clothes factory are women.A. third fifthsB. third fifthC. three fifthsD. three fifth( )19. The story took place in _______.A. the 1978B. 1978'sC. the year of 1978sD. the 1970s( )20. ______ other stars are much bigger and brighter than the sun.A. Thousands ofB. Thousand ofC. The thousand ofD. Thousands ( )21.The government of Chongqing is building _______ cheap and good houses for the people.A. thousandB. thousandsC. thousand ofD. thousands of( )22. Now, everybody, please turn to Page ______and look at the ______ picture.A. Fifth; fiveB. Five; fifthC. Fifth; fifthD. Five; five( )23----Do you have enough students to clean the laboratory ?----No, I think we need ______ students.A. anotherB. two othersC. more twoD. two more ( )24. We’ll have a ______ holiday. What about going to the West Lake?A. two daysB. two—dayC. two—daysD. two—days’( )25. ---How many teachers are there in your school ?---- ______, but I’m not sure.A. HundredsB. HundredC. Hundreds ofD. One hundred。