1、四、數詞表示數目多少或順序多少的詞叫數詞，數詞分為基數詞和序數詞。表示數目多少的數詞叫基數詞；表示順序的數詞叫序數詞。數字基數詞序數詞縮略式數字基數詞序數詞縮略式1OneFirst1st11ElevenEleventh11th2TwoSecond2nd12TwelveTwelfth12th3ThreeThird3rd13ThirteenThirteenth13th4FourFourth4th14FourteenFourteenth14th5FiveFifth5th15FifteenFifteenth15th6SixSixth6th20TwentyTwentieth20th7SevenSeven

2、th7th21Twenty oneTwenty first21st8EightEighth8th30ThirtyThirtieth30th9NineNinth9th40FortyFortieth40th10TenTenth10th100A hundredHundredth100th1 one 11 eleven 20 twenty2 two 12 twelve 21 twenty-one3 three 13 thirteen 30 thirty4 four 14 fourteen 40 forty5 five 15 fifteen 50 fifty6 six 16 sixteen 60 six

3、ty7 seven 17 seventeen 70 seventy8 eight 18 eighteen 80 eighty9 nine 19 nineteen 90 ninety10 ten 100 one(a)hundred 百1, 000 one(a)thousand 千10, 000 ten thousand 萬100, 000 one(a)hundred thousand 十萬1, 000, 000 one(a)million 百萬 (一) 基數詞1. 基數詞的構成方法下面是最基本的基數詞，其他數詞都是由這些基數詞構成的。其他基數詞的構成方法：（1）2199 的表示法。先說“幾十”，

4、再說“幾”，中間加連字號“-”。25 twenty-five 32 thirty-two49 forty-nine （2）101999的表示法。先說“幾百”，后接and，再加末尾兩位數(或末位數) 。206 two hundred and six 460 four hundred and sixty 683 six hundred and eighty-three 999 nine hundred and ninety-nine （3）1,000以上的基數詞的表示法。先從后向前數，每三位數加一個逗號，第一個逗號前的數為thousand（千），第二個逗號前的數為million（百萬），第三個逗號

5、前的數為billion（十億），然后一段一段地表示。45, 256 forty-five thousand, two hundred and fifty-six 50, 331, 250 fifty million, three hundred and thirty-one thousand, two hundred and fifty2. 基數詞的用法（1）基數詞修飾hundred，thousand，million，billion等詞時，這些詞要用單數形式；若和介詞of搭配構成短語表示不確定的數目時，這些詞要用復數形式。hundreds of dollars 幾百美元 millions of

6、 workers 數百萬工人（2）in ones +數詞的復數，意為“在某人歲時”。The scientist invented a new machine in his fifties. 這位科學家在他五十多歲的時候發明了一臺新機器。（3）in+the+年的復數，意為“在幾十年代”。Our country changed greatly in the eighties of the last century. 我們的國家在上個世紀八十年代發生了巨大變化。（4）表示時間9: 15 nine fifteen/ a quarter past nine 11:30 eleven thirty /ha

7、lf past eleven 11: 50 eleven fifty/ ten to twelve注意：當分鐘數小于或等于30時，可以用介詞past 表達；當分鐘數大于30時用介詞to表達。（5）表示序號Room 301 301號房間 Lesson 5第五課 Bus 332 332路公共汽車 巧記100以內的基數詞基數詞不難記，找清規律很容易，十二以內詞各異，十三數到十九去，后加-teen莫忘記。二十、三十至九十，尾巴要加-ty。要說“幾十幾”，中間“-”別丟棄。若說幾百幾十幾，百位十位用and。以上用法要記住，用時千萬莫大意。1st first2nd second3rd third4th f

8、ourth5th fifth6th sixth7th seventh8th eighth9th ninth10th tenth11th eleventh12th twelfth 13th thirteenth14th fourteenth15th fifteenth16th sixteenth17th seventeenth18th eighteenth19th nineteenth20th twentieth30th thirtieth40th fortieth50th fiftieth60th sixtieth70th seventieth80th eightieth90th nineti

9、eth100th one hundredth21st twenty-first22nd twenty-second23rd twenty-third35th thirty-fifth101st one hundred and first （二）序數詞1. 序數詞的構成方法下面是最基本的序數詞，其他序數詞都是由這些序數詞構成的。說明：（1）許多序數詞是由相應的基數詞后加詞尾-th構成的。four fourth，six sixth，ten tenth，sixteen sixteenth（2）少數基數詞變序數詞時，有特殊的形式，我們要熟記。one first (1st) two second (2n

10、d) threethird (3rd) nine ninth five fifth eight eighth twelve twelfth（3）以ty結尾的基數詞變序數詞時，將詞尾的y變i，加-eth。twentieth 第二十 thirtieth 第三十 fiftieth 第五十seventieth 第七十 eightieth 第八十 （4）非整十的多位數，只將個位數變成序數詞。twenty-sixth 第二十六 thirty-second 第三十二 ninety-first 第九十一 two hundred and forty-sixth 第二百四十六2. 序數詞的用法（1）序數詞表示順序

11、，常和the或形容詞性物主代詞一起使用I live on the third floor. 我住在三樓。Is this your first visit to our school? 這是你第一次參觀我們學校嗎？（2）表示日期May 1(st), 2008 讀作：May the first, two thousand and eight. 或the first of May, two thousand and eight. 2008年5月1日（3）和基數詞連用表示分數 1/5 one-fifth 3/4 three-fourths 1/3 one/ a third 2/3 two thirds

12、表達分數時分子用基數詞，分母用序數詞，分子超過“1”時，分母用復數形式。 巧記分數表達法分子基數詞，分母序數詞。分子大于一，分母加s。分母若是2和4，half，quarter可代替。模擬演練1. Now, everybody, please turn to Page _ and look at the _ picture.A. Fifth; five B. Five; fifthC. Fifth; fifth D. Five; five【解析】選B。基數詞前沒有冠詞，序數詞前有定冠詞the。本題后句句意為“請翻到第5頁，看第5幅圖”，Page Five“第5頁”，用基數詞；the fifth

13、picture“第5幅圖”，用序數詞。故選B項。2. Eight _ students in our school are from countryside.A. hundreds B. hundred C. hundreds of D. hundred of【解析】選B。hundred，thousand，million等數詞與基數詞連用時應該用單數形式，不能與of短語連用。故選B項。3.Well be back for our schools _ anniversary ceremony. I see. That means youll have a get-together with yo

14、ur classmates in _ years.A. fifteen; seven B. fifteenth; seven C. fifteen; seventh D. fifteenth; seventh【解析】選B。“學校十五周年慶典”應用序數詞表示；in后跟時間段，應該用基數詞表示，故選B項。4. “What time do you usually get up, John?” “I usually get up at _.”A. half past six B. half to six C. half after six D. half quarter six【解析】選A。6：30的

15、正確表達為half past six; 當分鐘數小于或等于30時，結構是“分鐘+past+該點鐘”意為“幾點過幾分”；如果分鐘數大于30，就用to來表示，結構是“分鐘+to+下一點鐘”意為“差幾分到幾點”；注意15分鐘可以用quarter來表達，而30分鐘可以用half來表達。5.A war took place in _.A. the 1720s B. 1720s C. 1720s D. the 1720【解析】選A。考查年代的表示法。表示“在十八世紀二十年代”要用 in the 1720s，故正確答案為A。6.There is a wrong word in line _. Where?

16、In the _ line. A. two; two B. two; second C. second; two D. second; second 【解析】選B。表示“在二/三排”應用in line two/ three或in the second/ third line兩種表達方式。分析比較四個選項可排除A、C、D三項，故選B項。7.How was your day off yesterday? Perfect! It was _ birthday of my grandpas. We had a big family celebration. A. seventy B. seventie

17、th C. the seventieth D. seven【解析】選C。句意：昨天你的休息日過得怎么樣？非常好！昨天是我爺爺的第七十個生日。我們進行了大規模的慶祝。表達第多少個生日時用序數詞，且前面加定冠詞the。故答案為C。8. Nowadays _ of business letters are written in English.A. two third B. two thirds C. two three D. second three 【解析】選B。分數表達法為“分子用基數詞，分母用序數 詞，分子大于1分母加s”。故答案為B項。9. Theres much meat in the basket, but _ of it is dirty.A. two three B. two