数词讲解专项练习1 数词的讲解一、定义：表示数目或顺序二、分类：分为基数词和序数词两种。

表示数目或数量多少的词叫基数词；表示数目顺序的词叫序数词。

三、基数词的构成：1）1-12的基数词是独立的单词，即：one ，two ，three ，four ，five ，six ，seven ，eight ，nine ，ten ，eleven ，twelve 。

2）13-19的基数词以-teen 结尾。

如：fourteen ，seventeen 等，但13，15，18较特殊，13—thirteen, 15—fifteen, 18—eighteen 。

3）20-90的整十位均以-ty 结尾。

如：sixty ，ninety ，但20，30，40，50，80较特殊，20—twenty, 30—thirty, 40—forty, 50—fifty, 80—eighty 。

4）十位数与个位数之间要加连字符号"-" ，如：28-twenty-eight ，96-ninety-six 。

5）百位和十位（若无十位则和个位）之间加and ，如：148—one hundred and forty-eight406—four hundred and six6）hundred （百），thousand （千），million （百万），billion （十亿）等前面即使有具体的数词，several, some, many也不能在它们的后面加-s 。

如：six hundred，eight million。

如果表示不确定数目时，用hundreds of /thousands of /millions of /billions of +名词复数, 前面不能再加数字。

7）1000以上的数字，从后往前数每三位加一个逗号" ，" 第一个逗号前为千（thousand ），第二个逗号前为百万（million ），第三个逗号前为billion （十亿）。

英语中无“万”这个词，我们可以用" 几十个千（thousand ）" 表示几万，" 几百个千（thousand ）" 表示" 几十万" 。

如：2，510＝two thousand five hundred and ten84，296＝eighty-four thousand two hundred and ninety-six274，350＝two hundred and seventy-four thousand three hundred and fifty。

四、序数词的构成：1）序数词一般是以与之相应的基数词尾加-th 构成，如：fourth, tenth, 但以下的这些基数词变为序数词时，有特别之处。

One —first, two —second, three —third, five—fifth, nine —ninth, twelve —twelfth2）以_ty 结尾的单词，要先变y 为i, 在加-eth. 。

如：thirty —thirtieth, fifty—fiftieth 3）以one, two, three 等结尾的多位数词，要将个位数变成序数词。

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。

（没有具体范围的限制）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。

五、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:7:15— fifteen/ a quarter past seven 7:30— half past seven③“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 hundred2000年— two thousand 1905年— 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 theeighth, nineteen ninety-eight或the eighth of June, nineteen ninety-eight。

3)世纪、年代表示法,如:(在) 90年代(in) the nineties(在) 19世纪(in) the nineteenth century(在) 18世纪30年代(in) the 1730s或in the 1730's4)编号的表示:①基数词放到名词的后边, 该名词一般要大写;序数词放到名词的前面,加定冠词。

Lesson 1/ the first lesson第一课Row 3/ the third row 第三排②Bus No. 3=the No. 3bus 3路公共汽车。

③表示住所时不用No .如:Room 302读作:room three o two 302房间。

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 double five six 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 thirds1/2 a / one half 1/4one fourth或a/ one quarter3/4 three fourths或three quarters6) 表示有小数的词用基数词,如:5.5 five point five12.135 twelve point one three five7)表示百分数,如:5℅ :five percent 0.8℅ zero point eight percent注意:分数、百分数与主谓一致当分数、百分数修饰可数名词的复数时, 谓语动词用复数形式;当分数、百分数修饰不可数名词时,谓语动词用单数形式。

如:Eighty percent of the students in our school come from Henan.我们学校百分之八十的学生来自河南。

Three fourths of the students in my class are interested in English.我们班四分之三的学生对英语感兴趣。

Two thirds of the water on the earth is sea water.地球上三分之二的水是海水。

8)其他用法,如:①基数词+单数名词+形容词构成合成形容词。

如:a five-year-old boy 一个五岁的男孩an 800-metre-long bridge 一座800米长的桥girls’ 400-metre relay race 女子400米接力②具体数词+metre (s )/kilometre (s )/kilo (s ) long /high /tall /deep / away 等。

如:The Changjiang River is 6, 300 kilometres long.长江长6300公里。

③表示“几十岁”用基数词的复数形式,如:in his thirties 在他三十几岁时④倍数的表达:一倍用once ,两倍用twice ,两倍以上用基数词+times 。

如: five times 5倍补充:倍数的表示法:1. 表示“几倍大小(长短;数量) ” ,由“倍数+ the size(length, amount width age height.) +of ”结构组成。

如:The earth is forth-nine times the size of the moon. 地球的大小是月亮的四十九倍。

2. 表示“……比……大几倍” ,由“倍数+形容词(副词)比较级+ than +被比较部分”结构组成。

如:This box is three times bigger than that one.这个箱子比那个箱子大三倍。

(这个箱子是那个箱子的四倍。

)数词练习( ) 1. Every year, _____ people go to visit their factoryA. a thousand of B thousands C. thousand of D. thousands of( ) 2. Tom has just finished writing a _________ article.A. nine-hundred-wordsB. nine-hundreds-wordC. nine-hundred-wordD. nine-hundreds-words( ) 3._______ people lost their homes in Japan’ s earthquake.A. Two thousandsB. ThousandC. Thousands ofD. Thousand of( ) 4. Last year, I visited a chemical factory in Baise, there are about _____ workers in it.A.six thousandsB. six thousandC. six thousands ofD. six thousand of( ) 5. About _______of the students in our class were born in the_____.A. two-thirds, 1990sB. two-thirds, 1990C. two-third, 1990sD. two-third, 1990( ) 6. Nowadays of business letters are written in English.A. two thirdB. two thirdsC. two three C. second three( ) 7. —If a=4, b=5, what’s the answer to the question “ a + 2ab +1 =?”—A. Forty-fifthB. Forty-fiveC. Twenty-threeD. One hundred and twenty-one( ) 8. — How often do you exercise?— _________a week.A. TwoB. TwiceC. SecondD.Three( ) 9. The teacher said that__ of the boys would take part in the talent show.A. three fiveB. three fivesC. thirds fifthsD. three fifths( ) 10.Tomorrow is the boy’s ________ birthday.A. seventhB. sevenC. seventeenD. a seventh( ) 11.— Which is the biggest number of the four?— .A . One-thirdB . Two-thirdsC . A halfD . A quarter( ) 12. — Excuse me, where can I buy a jacket?— You can go to the Men's Wear Section on the_________ floor.A. twoB. twiceC. secondD. three( )13. __ _ of the land is covered with trees and grass in Pingjiang, Yueyang.A. Three fivesB. T hree fifthsC. Three fifthD. Threes fifth( ) 14. September is _____ month of the year.A. ninthB. nineC. the nineD. the ninth( ) 15.— How was your day off yesterday?—Perfect! It was my grandma’ s ________ birthday. We had a big cake.A. eightyB. eightiethC. the eightiethD. the eightieth( ) 16. — Excuse me, how can I get to the museum?— Sorry. It's my______ time to be here.A. oneB. firstC. onceD.two( ) 17.You can see _______ if you go out at night.A. million starsB. thousand of starsC. hundreds starslion of stars( ) 18.— Is this your ________ visit to my hometown, Zunyi?—No. I’ ve been here for many times.A. oneB. the firstC. firstD. twice( ) 19.More than nine students are doing sports now.A .hundreds B. hundred of C. hundred D. hundreds of( ) 20. Now, everybody, please turn to Page ________ and look at the________picture. A. Fifth; five B. Five; fifth C. Fifth; fifth D. Five; five( )21. For breakfast, I usually have______ and two pieces of bread.A. a cup of mild halfB. half a cup of milkC. a half milk cupD. half a milk cup( ) 22. The government of Chongqing is building_______ cheap and good houses for the people.A. thousandB. thousandsC. thousand ofD. thousands of( ) 1. There are about ________ students in our school.A. two thousand ofB. two thousandsC. two thousands ofD. two thousand ( ) 2. There are ________ students in our grade.A. three hundreds and forty-fiveB. three hundred and forty fiveC. three hundred forty-fiveD. three hundred and forty-five( ) 3. Sunday is ________ day of the week.A. the firstB. oneC. he seventhD. the seven( ) 4. Please come to my office ________.A. at half past eightB. at half passed eitherC. in half past eightD. on half past eight ( ) 5. If you want to go to the cinema, take ________.A. bus No. the ninthB. the No. 9 busC. No. 9 the busD. No. the ninth bus( ) 6. The Greens came to China ________.A. in 1984 October 27B. in October 27, 1984C. on 27, 1984 OctoberD. on October 27, 1984( ) 7. The story took place in ________.A. nineteen centuriesB. nineteen centuryC. the nineteenth centuryD. nineteenth century( ) 8. I was told they would stay in China for ________.A. one and a half yearsB. one and a half yearC. one and half yearsD. one half and one year( ) 9. Tomorrow we are going to learn ________.A. Lesson SecondB. the Lesson TwoC. Lesson TwoD. second lesson( ) 10. I think that the first day of spring is ________.A. twenty-two of MarchB. twenty-second on MarchC. twenty-two in MarchD. the twenty-second of March( ) 11. ________ letter of the word “restaurant” is “n”.A. The ninethB. NinethC. The ninthD. Ninth( ) 12. We talked for ________.A. half a hourB. half hourC. an hour halfD. half an hour( ) 13. The bus will leave at ________ this afternoon.A. three fifteenB. three and fifteenC. three quartersD. fifty to three ( ) 14. The earth is ________ the size of the moon.A. 49 the timesB. 49 timesC. 49 timeD. fourty-nine times( ) 15. It’s a ________ ruler.A. two-feet-longB. two feet longC. two-foot-longD. two-foot-long( ) 16. ________ students are planting trees.A. Several hundredsB. Several hundredC. Five hundredsD. Five hundred of ( ) 17. ________ to finish quickly.A. No every student wantsB. No every student wantC. Not every student wantsD. Not every student want( ) 18. ________ ago, our country was covered by thick forests.A. Several million of yearB. Several million yearC. Several million yearsD. Several million of years( ) 19. The weight of the moon is only about ________ of that of the earth.A. one eightyB. one of eightyC. one the eightiethD. one eightieth( ) 20. It’s 11:45. Yes, it’s ________.A. fifteen past twelveB. fifteen from twelveC. a quarter past eightiethD. a quarter to twelve( ) 21. What date is it? It’s ________.A. July twentieth-firstB. of July twenty-firstC. the twenty-first of JulyD. a quarter to twelve( ) 22. ---- ________, please? ---- It was April 25th.A. How old are youB. What was the date yesterdayC. What time was itD. What day is it today( ) 23. I have ________ things to do. I can’t play ________.A. many, no moreB. a lot of, any moreC. much, moreD. much, any more ( ) 24. I have a ________ paper on my desk.A. littleB. lotC. lotsD. little of( ) 25. This is ________.A. the question thirtyB. the question thirteenC. thirty questionD. question thirteen ( ) 26. ________ of the work has been done.A. Two thirdB. Two threeC. Two thirdsD. Two third( ) 27. It’s ________ now. Let’s hurry.A. half passed sixB. thirty passed sixC. half pass sixD. half to seven( ) 28. What’s the date today? It’s ________.A. the June fourthB. the fourth of JuneC. of June the fourthD. fourth June( ) 29. Next week we’re going to lean ________.A. unit 5B. the unit 5C. Unit 5D. 5 Unit( ) 30. Do you have much work to do this weekend? Yes, I have to write a ________ paper.A. two-thousand-wordB. two-thousand-wordsC. two-thousands-wordD. two-thousands-words( ) 31. The tree is ________ tall.A. forteen feetB. fourteen feetC. fourteen footD. fourty foot( ) 32. Fifty plus ________.A. fourty is ninetyB. forty is ninetyC. thirty is ninetyD. fourty is ninety( ) 33. There are ________ students in this school.A. four hundred fifty-twoB. four hundreds fifty-twoC. four hundred and fifty-twoD. four hundred and fifty two( ) 34. My home is about ________ away from the school.A. three hundred metreB. three hundreds metresC. three hundred metresD. three hundreds metre( ) 35. December is ________ and last month is a year.A. the twelvethB. twelvethC. the twelfthD. twelfth( ) 36. ________ of the teachers in the school are from colleges.A. Three quartersB. Two-thirdC. Two fifthD. Two-nineths( ) 37. There are two world wars during ________ century.A. the twentiesB. the twentiethC. twentiesD. twentieth( ) 39. In the forties, his father served in the New ________ Army（新四军）,while this motherworked in the ________ Route Army.（八路军）A. the twenty-first lessonB. Lesson Twenty FirstC. the 21th lessonD. Lesson 21th( ) 40. He will stay here for ________.A. one and half monthB. one and a half monthC. one months and halfD. one and a half months( ) 41. ---- What’s the date today? ---- It’s ________.A. nineB. MondayC. June 5D. 11:00( ) 42. ---- Would you like to eat ________ apples? ---- No, thank you.A. more twoB. two moreC. two anotherD. two else( ) 43. He said he would come back in ________.A. one or two daysB. a or two daysC. one and two daysD. a day and two( ) 44. --- How often do you write to your parents abroad? ---- ________.A. Twice a monthB. Second times a monthC. A second time a monthD. Second a time a month( ) 45. ________ people died in the traffic accidents in the world.A. Thousand ofB. Thousands ofC. Ten thousands ofD. Ten thousand of( ) 46. What is the time? It’s ________. (4:25)A. four twenty-fiveB. four past twenty-fiveC. twenty-five to fourD. four twenty five ( ) 47. Mr. Smith lives on ________ floor.A. fivethB. fifthC. the fivethD. the fifth( ) 48. He began to learn English in his ________.A. fiftyB. fiftiethC. fiftiesD. fifth( ) 49. His sister was born ________.A. in 1998, October 21B. on 1998, October 21C. in October 21, 1998D. on October 21, 1998( ) 50. When he was ________, he left home to work in different cities.A. in his twentyB. at his twentyC. in his twentiesD. at his twenties( ) 51. I’m ________ than you.A. five years olderB. fifteen year oldC. fifteen yearsD. fifteen old( ) 52. ---- How old are you? ---- I’m________.A. fifteen years oldB. fifteen year oldC. fifteen yearsD. fifteen old( ) 53. ---- How many teachers are there in your school? ---- ________, but I’m not sure.A. HundredsB. HundredC. HundredsD. One hundred( ) 54. About ________ of the books in our school library are written in Chinese.A. four-fifthB. four-fifthsC. fourth-fifthsD. fourths-fifth( ) 55. They planted ________ trees on the farm last year.A. two hundredsB. two hundred ofC. two hundreds ofD. hundreds of( ) 56. I think that the ________ century will bring us more hopes.A. twenty-oneB. twentieth-firstC. twenty-firstD. twentieth-one( ) 57. I think________ lesson is the most difficult in this book.A. fiveB. fifthC. the fifthD. fifteen( ) 58. ________ travelers come to visit our city every year.A. Hundred ofB. Hundreds ofC. Five HundredsD. Hundred( ) 59. We have five ________ students in our school.A. hundred ofB. Hundreds ofC. hundredD. hundreds( ) 60. ________ of the teachers in the school is 300. ________ of them are women teachers.A. The number, first fourthB. The number, one fourthC. A number, one secondD. A number, three quarters( ) 61. The English swimmer came in ________ third.A. aB. anC. /D. the( ) 62. ________ I found out that he was away in town.A. Other dayB. One dayC. A dayD. Some day( ) 63. Play ________ music for me, will you?A. aB. a piece ofC. anD. some piece of( ) 64. ________ of the land is covered ________ water.A. Two third, byB. Two three, withC. Two thirds, byD. Two third, with参考答案：一、1. D 2. D 3. A 4. A 5. B 6. D 7. C 8. A 9. C 10. D 11. C 12. D 13. A 14. B 15. C 16. B17.C 18. C 19.D 20. D 21. C 22. B 23. B 24. A 25. D 26. C 27. C 28. B 29. C 30. A 31. B 32. B33.C 34. C 35. C 36. A 37. B 38. A 39. A 40.D 41. C 42. B 43. A 44. A 45. B 46. A 47. D 48. C49. D50. C 51. A 52. A 53. D 54. B 55. D 56. C 57. C 58. B 59. C 60. B 61. C 62. B 63. B 64. C。