1、数词数词基数词基数词 序数词序数词数词的用法数词的用法1 1、基数词的构成、基数词的构成（1）1-12的基数词是独立的单词，有其各自的形式。one two three four five six seven eight nine ten eleven twelve（2）13-19的基数词以-teen结尾。thirteen fourteen fifteen sixteen seventeen eighteen nineteen （3）20-90 的整十位数基数词以-ty结尾。twenty thirty forty fifty sixty seventy eighty ninety（4）21-90
2、 的非整十位数的表示法，是在十位数 和个位数之间用连字符“-”。twenty-one 21 thirty-three 33 e.g.53 64 75 99 （5）百、千、百万、十万的表示方法。N00 hundred N,000 thousand N,000,000 million N,000,000,000 billione.g.100 one hundred 2,000 two thousand 3,000,000 three million 4,000,000,000 four billion（6 6）101-999101-999的基数词的表示法，是在百位数和的基数词的表示法，是在百位数和
3、十位数之间，或在百位数和个位数之间加十位数之间，或在百位数和个位数之间加”and”.”and”.e.g.one hundred and two 102 two hundred and sixteen 216 four hundred and four 404 513 222 363 999（7）1000以上的数目表示方法。e.g.2,004 two thousand and four34,228 thirty-four thousand,two hundred and twenty-eight725,369 seven hundred and twenty-five thousand,thre
4、e hundred and sixty-nine 17,657,400 1,214,000,000巧学妙记巧学妙记一至十二词各异，一个一个单独记，前轻后重（teen）是十几，前重后轻（ty）是几十fourteen,forty分清楚，thirteen,thirty看仔细，eighteen(eighty)只有一个t,几十几和几百几连字符、and莫丢弃Exercise1、-Excuse me,how does this number 20,135 read?-It read .A.twenty thousands one hundred and thirty-fiveB.twenty thousan
5、d one hundred and thirty fiveC.twenty thousand one hundred and thirty-fiveD.twenty thousands,one hundred and thirty-fiveExercise2、-Bob,can you write the number seven hundred and eighty thousand and thirty-two?-Yes,it is _.A.78,032 B.7,832 C.7,032 D.780,032 2.2.基数词的运用基数词的运用（1 1）表示具体数目时，）表示具体数目时，hundr
6、edhundred，thousandthousand，millionmillion等等 用单数用单数;e.g.five hundred eight hundred(2)(2)表示不确切数目时可以用复数形式，与表示不确切数目时可以用复数形式，与of of连用表示连用表示 “数以数以.计的计的”；hundreds of 成百上千 thousands of 成千上万e.g.Thousands of trees must be planted every year.(3)基数词的复数形式可用来表示人的岁数和年代。年代：in the+年代+s(或s)表示“在世纪年代”in ones+整10数的复数形式
7、表示一个不确定的年龄e.g.He went to the United States in his twenties.That was in the early forties(4)(4)由基数词和名词合成的形容词作定语时，其中由基数词和名词合成的形容词作定语时，其中的名词只用单数。的名词只用单数。e.g.She wrote a two-thousand-word composition last night.Claude is an eleven-year-old boy.I m a eighteen-year-old girl.Exercise1、How many people will
8、come to Beijing next year?(2009芜湖)Its hard to say,_ people,I think.million of B.millions of C.three millions D.three millions ofExercise2、In the past twenty years,many tall buildings have been built in our city.look!This is a _.(09年天津中考)A.70-floor building B.70-floors building C.70-floor buildings D
9、.70 floors building基数词基数词oneonetwotwothreethreefi five veeighteightninenineTwelveTwelve序数词序数词firstfirstsecondsecondthirdthirdfiffifth theighteighth hninninth thtwelftwelfth th（1）第一第十九的构成。除第一，第二，第三，第五，第八，第九，第十二为除第一，第二，第三，第五，第八，第九，第十二为特殊形式，其他的序数词均由其对应的基数词加后缀特殊形式，其他的序数词均由其对应的基数词加后缀-thth构成。构成。four fourt
10、h six sixth seven seventh eleven eleventh thirteen thirteenth fourteen fourteenth fifteen fifteenth sixteen sixteenth seventeen seventeenth eighteen eighteenth nineteen nineteenth（2 2）整十的数字序数词的构成方法：将对应的基）整十的数字序数词的构成方法：将对应的基 数词结尾数词结尾y y变变i i，再加，再加-eth.-eth.e.g.twent e.g.twenty y twenti twentietheth t
11、hirt thirty y thirti thirtietheth fort forty y forti fortietheth fift fifty y fiftififtietheth sixt sixty y sixtisixtietheth sevent seventy y seventiseventietheth eight eighty y eightieightietheth ninet ninety y ninetininetietheth（3）表示“几十几”时，十位数的基数词不变，只把个位数变成序数词即可。e.g.36 thirty-six 第36 thirty-sixth
12、98 ninety-eight 第98 ninety-eighth 第 55 fifty-fifth 第 74 seventy-fourth 第 88 eighty-eighth 第1-99 （4 4）百，千，百万等的序数词在词尾加）百，千，百万等的序数词在词尾加-th-th。e.g.第一百 hundredth 第一千 thousandth 第一百万 millionth 第十亿 billionth 若是多位数，则前边的数用基数词，末尾数用序数词。e.g.第101 one hundred and first 第199 one hundred and ninety-ninth（5 5）序数词的缩写
13、形式是由阿拉伯数字加上序数）序数词的缩写形式是由阿拉伯数字加上序数词的最后两个字母构成的。词的最后两个字母构成的。e.g.fire.g.first st-1st seco-1st second nd-2nd thi-2nd third rd 3rd3rd fourth-4 fourth-4th th twelfth-12t twelfth-12th h twenty-fir twenty-first st 21 st 21 st forty-fift forty-fifth h 45 th 45 th one hundred and fifty-thi one hundred and fift
14、y-third rd 153 rd 153 rdExercise1、-How old is your son?-.We had a special party for his birthday last Sunday.A.Nine;ninth B.Nine;nineC.Ninth;nine D.Ninth;ninth 2、I think that the century(世纪)will bring us more hopes.A.twenty-one B.twentieth-firstC.twenty-first D.twentieth-one 2.2.序数词的用法序数词的用法(1 1）在使用
15、序数词时，通常前面要加定冠词）在使用序数词时，通常前面要加定冠词the.the.e.g.The second lesson is more difficult e.g.The second lesson is more difficult than the first.than the first.(2)(2)序数词前面出现不定冠词序数词前面出现不定冠词a/ana/an时，表示时，表示“再一，再一，又一又一”。e.g.e.g.Weve tired it three times.Must we try it a fourth time？His parents have His parents h
16、ave two two children,but they want a children,but they want a thirdthird one.one.(3)(3)序数词前有物主代词或其他修饰语时不用任何序数词前有物主代词或其他修饰语时不用任何冠词。冠词。e.g.This is e.g.This is mymy first first job.job.Mrs.Blacks second child called Lucy.(3)(3)基数词表顺序，置于名词之后；序数词表基数词表顺序，置于名词之后；序数词表顺序，置于名词之前，且与顺序，置于名词之前，且与thethe连用连用Part T
17、wo-the Second PartPart Two-the Second PartLesson Seven-the Seventh LessonLesson Seven-the Seventh Lessonpage 48-the forty-eighth pagepage 48-the forty-eighth pageRoom 302,World War IIRoom 302,World War IIExercise1、I got a good present on my birthday and I like it very much.A.fifteen B.fifteenth C.th
18、e fifteen D.the fifteenth2、-I hear your pen friend is visiting Lianyungang again.Is it the time for him?-Yes,and he will come for a third time next spring.first B.second C.third D.fourth3、There are days in June and day is Childrens Day.A.thirty;the second B.thirty;first C.thirteen;the first D.thirty
19、;the first 4、There are _ people in my family.We live in the _ floor in a tall building.A.five;six B.fifth;sixth C.fifth;six D.five;sixth5.We are going to learn _next week.Lesson TwelveB.Lesson TwelfthC.Twelfth LessonD.the lesson Twelfth 3、数词的运用 1.1.表示时间表示时间（1 1）先读钟点数）先读钟点数,后读分钟数。后读分钟数。e.g.10:10 ten
20、tene.g.10:10 ten ten 4 4：25 25 four four twenty-fivtwenty-five e 6 6：4343 six forty-three six forty-three (2)用介词past表示几点过几分（不超过半时）；用to表示差几分到几点。e.g.4:20 twenty e.g.4:20 twenty past past four four 8:42 eighteen 8:42 eighteen to to ninenine 60-42=1860-42=18 9:50 ten 9:50 ten to to ten ten 10:1010:10 te
21、n ten pastpast ten ten(3)(3)整点直接用（整点直接用（+oclock+oclock）表示。）表示。“半半点钟点钟”halfhalf，一刻钟用，一刻钟用a quartera quarter。e.g.6:00 six oclocke.g.6:00 six oclock 7:15 7:15 a quarter past sevena quarter past seven 8:30 half 8:30 half past past eighteightExercise 1.4:45 2.8:17 3.11:58 4.9:562.表示年、月、日 (1)(1)年份年份 1949
22、1949 nineteen forty-nine nineteen forty-nine 20052005 twenty hundred and fivetwenty hundred and five two thousand and five two thousand and five 18001800 eighteen hundredeighteen hundred （2）日期 20082008年年4 4月月1010日日 April 10 April 10,20082008 April April 1010th th ,20082008 1010th th Apri April l 200
23、8 2008 20102010年年9 9月月1 1日日 September 1September 1,20102010 September 1 September 1st st,2010 2010 1 1st st September 2010 September 2010 英语中一般用英语中一般用月、日、年月、日、年或或日、月、年日、月、年来来表示。日期可表示。日期可以用基数（读以用基数（读做序数词）。做序数词）。Exercise 1.1998 2.2015 3.1999年3月3日 4.2015年7月24日 3.表示分数 (1)分数的表达 分子1 分母复数 one half one thir
24、d two thirds one quarter three fourths/three quarters2131324143 one one andand two thirds two thirds ten ten and and three fifths three fifths 3215310 meter meter four fifths meter four fifths meter metermeters s two and threetwo and three fourths fourths metersmeters 54432 （2 2）分数的用法）分数的用法 “分数分数+of
25、+of+名词名词/代词代词”作主语时，作主语时，谓语动词的单复数取决于名词。谓语动词的单复数取决于名词。e.g.Two thirds of the students are boys in my class.One half of her money is spent on books.Exercise 1.About _ of the workers in 1.About _ of the workers in the clothes factory are women.the clothes factory are women.A.third fifths A.third fifths B
26、.third fifth B.third fifth C.three fifths C.three fifths D.three fifth D.three fifth 2.We all know that _ of 2.We all know that _ of the earth _ covered by sea.the earth _ covered by sea.A.three fourth;is A.three fourth;is B.three fourths;is B.three fourths;is C.three fourths;are C.three fourths;are
27、 D.third four;is D.third four;is 4.倍数 表示表示三或三倍三或三倍以上的倍数用以上的倍数用“基数基数 词词+times+times”。e.g.This apple is twice as large as that one.This room is three times larger than that one.5.数词前加every，表示 “每一段时间或每隔一 段时间。e.g.e.g.every every ten ten days days 每十天每十天 every every ninth ninth day day 每隔九天每隔九天 every eve
28、ry four four weeks weeks 每四个星期每四个星期 every every third third week week 每隔三个星期每隔三个星期6.表示小数和百分数(1)(1)小数用基数词来表达，以小数用基数词来表达，以小数点为界，左边的数字为小数点为界，左边的数字为一个单位，表示整数，数字一个单位，表示整数，数字合起来读；小数点右边的数合起来读；小数点右边的数字为一个单位，表示小数，字为一个单位，表示小数，数字分开读。数字分开读。e.g.1.03 one point o three zero 10.23 ten point two three 25.67 twenty-f
29、ive point six seven (2)百分数 百分数用百分数用 “基数词基数词+percentpercent”表示表示。e.g.50%fifty percent 34.67%thirty-four pointSix seven percent 0.12%zero point onetwo percent 7.排列顺序基数词和序数词都能表示排列顺序。基数词和序数词都能表示排列顺序。事物名词事物名词+基数词基数词 the+the+序数词序数词+事物名词事物名词e.g.e.g.第一部分第一部分 Part one=the first partPart one=the first part 第一
30、课第一课 Lesson one=the first lessonLesson one=the first lesson 第三组第三组 Group three=the third groupGroup three=the third group 0.49 point four nine 1.5 one point five 8.67 eight point six seven 30.6 thirty point six 17.42%seventeen point four two percent6.9.57%nine point five seven percentExercise 8.其他用法
31、（1）基数词表示年龄 in ones+基数词复数e.g.five years old e.g.five years old in in onesones forties forties My elder sister is My elder sister is seventeenseventeen and my and my younger sister is younger sister is tenten.My uncle is My uncle is in his thirties.in his thirties.I m eighteen.I m eighteen.(2)表示房间号和电话
32、号码e.g.202 room two o two e.g.202 room two o two 404 room four o four 404 room four o four303-2244 303-2244 Three o three double two four fourThree o three double two four four(3)(3)页码数，行数页码数，行数e.g.e.g.第第1010页：页：page tenpage ten 第第2525页：页：page twenty-five page twenty-five 第第109109页：页：page one hundred page one hundred and nine and nine 第第6 6行：行：line sixline six 第第2929行：行：line twenty-nine line twenty-nine
