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1、 掌握分数、时间、日期的表达法。【复习要点(一)基数词基数词用来表示数目,或者说表示数量的词叫基数词。最基本的基数词如下表所示。1 one11 eleven100 a hundred2 two12 twelve20 twenty1000 a thousand3 three13 thirteen30 thirty1,000, 000 a million4 four14 fourteen40 forty10, 000, 000 ten million5 five15 fifteen50 fifty100, 000, 000 a hundred million6 six16 sixteen60 si

2、xty1,000, 000, 000 a billion7 seven17 seventeen70 seventy8 eight18 eighteen80 eighty9 nine19 nineteen90 ninety10 ten说明:113 19 是由个位数加后缀-teen 构成。注意其中 13、15 的拼写是 thirteen和 fifteen 。22090 由个位数加后缀-ty 构成,注意其中 20 50 的拼写分别是twenty,thirty, forty和 fifty;80 的拼写是eighty 。3其它非整十的两位数 21 99 是由整十位数加连字符 “-”,再加个位数构成。如:

3、 81 eighty-one 。4 101 999 的基数词先写百位数,后加and 再写十位数和个位数。如:691 six hundred and ninety-one 。5 1000 以上的基数词先写千位数,后写百位数,再加and,最后写十位数和个位数。如:5893 five thousand eight hundred and ninety-three 。 在基数词中只有表示 “百 ”、“千 ”的单位词,没有单独表示“万 ”、“亿 ”的单位词,而是用 thousand(千)和 million (百万)来表达,其换算关系为:1 万=10thousand;1 亿 =100 million; 1

4、0亿 =a thousand million=a billion 。6多位数的读法:1) 1000 以上的多位数,要使用计数间隔或逗号“, ”。即从个位起,每隔三位加一个间隔或逗号。第一个间隔或逗号前是thousand(千),第二个间隔或逗号前是 million (百万),第三个间隔或逗号前是 a thousand million 或 a billion( 十亿 ) 。2)每隔三位分段以后就都成了 101 999。读的时候十位数(或个位数)的前面一般要加 and。如:888, 000, 000 读作: eight hundred and eighty-eight million。基数词的用法:

5、1. 基数词在句中的作用基数词的作用相当于名词和形容词,在句中可作定语、 主语、宾语(介宾)、表语、同位语等。例如: Three and five is eight. 3+5=8(作表语) How many oranges doyou want? 你要多少桔子?I want eight. 我要八个。 (作宾语)There are eight boats in the lake. 湖里有八条小船。 (作定语)2Hundred, thousand, million,dozen, score 这些词前面如有表示具体数字的词,它们不能加“s”,反之则须加“s,”并要与 of 短语连用。例如:three

6、 hundred people, five thousand years;thousands of people, hundreds of students, thousands of trees(二)序数词表示顺序的词,叫序数词。序数词用来表示数词顺序。除特殊情况外,序数词一般都由相应的基数词加后缀-th 构成。请见下表:第一到第十第十一到第十九第二十以上firsteleventhtwentiethsecondtwelfththirtieththirdthirteenthfortiethfourthfourteenthfiftiethfifthfifteenthsixtiethsixthsi

7、xteenthseventiethseventhseventeentheightietheightheighteenthninetiethninthnineteenthhundredthtenththousandth说明:1英语中表示第一、第二、第三的序数词属特殊形式,要注意它们的拼写。2表示 “几十 ”的序数词通常是将基数词词尾y 变成 i 再加上后缀 -eth。3其余的二位数序数词是以相应的整十基数词加个位序数词。如:fifty-first (第五十一) 。4少数序数词拼法不规则,如: fifth (第五),eighth(第八),ninth(第九), twelfth (第十二)等。注意:1

8、序数词可缩写为阿拉伯数字加序数词最后两个字母。例如:第一: (the) first=1st第二: (the) second=2nd第三: (the) third=3rd第五: (the) fifth=5th第九十七: (the) ninety-seventh=97th第一百零一:(the) one hundred (and)first=101st2编了号的事物要用基数词表示顺序,但是基数词要后置。例如:第一课: Lesson One第三十二页: Page 32第 305 房间: Room 305第 12 路公共汽车: Bus No.12序数词的用法序数词表顺序,主要作定语,其前面须加上定冠词t

9、he,此外,也作主语、宾语、表语和定语 等,这时,被它所修饰的名词往往被省略。如:The first ( person ) to arrive is Kate.例如:The first is bigger than the second.(作主语)第一个比第二个大。Give me the first.(作宾语)把第一个给我。She s oftenthe first to go to school. (作表语)她经常第一个去上学。 We re going to learn the eighth lesson. (作定语)我们将要学习第八课。(三)分数表达法先写基数词表示分子,后写序数词表示分母,

10、如果分子大于 1 时,分母用复数。 如: one-fourth, two-fifths, three-tenths(四) 小数表达法小数点前的整数按基数词的规则表示,小数点写作point, 小数后的数字应按其数字直接表示出来。如:18.38 可写成: eighteen point three eight 。注意:小数在句中常作定语,尤其在比较方式状语从句中被使用。如:This stone is 3.5 times heavier than that one.(五)百分数表达法(根据学生情况选择使用)在数词后加percent。例如: 15%读作: fifteen percent ;60%读作:

11、sixtypercent(六)表示倍数(根据学生情况选择使用)1) 几倍大小(长短,数量) = 几倍(或分数) +the size(length, amount) 。例如: The earth is forty-nine times the size of the moon.地球是月球的49 倍。2) 比 几倍 = 倍数(或分数) +形容词(副词)比较级 +than+ 被比部分。例如: His house is three times bigger than mine. 他的房子比我的房子大三倍。3) 是倍 = 倍数(或分数)+as +形容词 +as +被比部分。例如:This factory

12、 is four times as big as that one.这个工厂是那个工厂的四倍。(七)表示约数(根据学生情况选择使用)1) “多于 ”用 more than 或 over。例如: The street is over(more than) 500 metres long. 这条街有 500 多米长。2) “小于 ”用 less than。例如: Three are less than 30 people in the classroom. 教室里不到三十人。3) “或 以上 ”用 or more。例如: The building can hold 5000 people or m

13、ore.那座建筑物可容纳 5000 人或 5000 人以上。4) “或 以下 ”用 or less。例如: We can finish the work in two weeks or less.我们可以在两周内或不到两周完成这件工作。5) “大约 ”用 about, around, nearly 等。例如: The box weighs about 50 pounds. 这箱子重约50 镑。6) “左右 ”用 or so.如: In the past ten years or so, they have changed a lot. 在过去的十年里,他们改变了许多。(八)年、月、日和时间的表

14、达法1年份用基数词表达,分两位一读,年份前用介词in。例如:1999nineteenninety-nine2000twothousand2001twothousand and one2月份的第一个字母要大写,有些月份名称有缩写形式。例如:一月January(Jan.), 二月February(Feb.),三月March(Mar.),四月( Apr. ) , 五月 May, 六月 June, 七月 July, 八月 August(Aug.) ,九月September(Sep.), 十月October(Oct.),十一月November(Nov.),十二月December(Dec.) 。3日期的表

15、达要用序数词,读时前面要加定冠词the,介词要使用on。例如:在6 月 1 日: on June 1st 读作: on June the first.年、月、日同时表达时,一般应先写月、日、后写年。如:在2001年 5月4日: on May 4 th, 2001 。4年代用基数词的复数表示。例如: 20 世纪 90 年代: nineteen nineties; 21 世纪 20 年代: twentytwenties5时间表达法:时间可用顺读法或倒读法两种方式表达。例如:5:00 five (o clock)6:18 six eighteen 或 eighteen past six12: 15

16、twelve fifteen或 fifteen (a quarter) past twelve4: 30 four thirty 或 half past four6: 45 six forty-fiveaquarter to seven注意:1)表示整点时间, 直接用基数词表达,后边可接o clock也(可不加 )。表达 “几点几分 ”时,绝不能用oclock。2)表达 “ 15分 ”或 “ 45分 ”时,常用 quarter(刻)。3)在倒读法中,如果钟点不过半,须用“分钟数 +past+钟点数 ”的形式;如果钟点过半,则用 “差多少分钟数 +to+ 全钟点(下个钟点数) ”的形式。两组与数

17、词有关的介词短语: in+ 定冠词 the+数词的复数形式,表示年代。如:in the 1870s 或1870 s in+ 物主代词 +数词的复数形式,表示某人的年龄。如:in one sthirties 。有时在物主代词后面可加上形容词early 或 late 使其含义更确切些。如: The young man is at most in his early thirties.注意:带有数词的名词作定语的表达:a seven-year-old boy , ahundred-metre race数词专项练习 (一 )() 1. Lincoln was born on _.A. February

18、 12, 1809B. 1809, February 12C. 1809, 12 FebruaryD. February 1809,12() 2. A _ boy can sing the English song very well.A. ten-year-oldB. ten years oldC. ten-year-old() 3. An hour later, _ minister was sent to see themen.D. fifth years old box by those twoA. twoB. the secondC. the twoD. second() 4. Ab

19、raham Lincoln was _ President of the United StatesA. 16B. the 16C. 16thD. the 16 th() 5. Do you think there is any room for us _ ?A. twoB. the twoC. secondD. the second() 6. -How many students are there in your class?- _.A. Twenty nineB. Thirty and twoC. Forty-fiveD. fifties() 7. Which number is wro

20、ng? _.A. NinetyB. NinteenC. NinthD. Nineteenth() 8. The People s Liberation Army was founded _.A. on August 1, 1927B. in 1927, 1 AugustC. on August 1 st, 1927D. in August 1, 1927() 9. The number 4,123 is read _.A. four thousand one hundred and twenty-three B.four thousand and one hundred twenty-thre

21、eC. four thousand and a hundred and twenty-threeD. four thousands a hundred and twenty-three() 10. The old professor still works hard though he is _.A. in his sixtyB. in his sixtiesC. in sixtiesD. in the sixty数词专项练习 (二 )()76. Tuesday is the _ day of a week in English.A. firstB. fifthC. thirdD. fourt

22、h()77. There are _ seasons in a year in our country.A. twoB. fourC. secondD. fourth()78. The game of _ Olympics will be held in Beijing in 2008.A. 29 B. the 29th C. the 29 D. 29th()79. Most of the stars are much more bigger than the sun. But they are _light years away from us.A. thousandB. thousands

23、C. thousand ofD. thousands of()80. _ of the surface( 表面 ) of the earth is covered with water.A. First thirdB. Two thirdsC. One threeD. Two three()81. There are _ people in my family. We live on the _ floorin a tall building.A. five, sixB. fifth, sixthC. fifth, sixD. five, sixth()82. Boys and girls,

24、we are going to learn _ today.A. Four LessonB. the fourth lessonC. the Lesson FourD. the Four Lesson()83. My lovely daughter is _.A. eight years old B. eight-year-old C. eight year old D. eight-years-old()84. The flood happened _.A. in the summer of 1998 B. in the summer of 1998sC. in 1998 of the su

25、mmer D. in 1998s of the summer()85. February 28 should be read as _.A. February of the 28thB . February of 28C. 28 of FebruaryD. the 28th of February()86. - How soon will you finish your work?- In about _.A. one and a half monthB. one month and a halfC. one and half a monthD. a month and half()87. W

26、e will have a _ holiday. What about going to Suzhou?A. five daysB. five dayC. five-dayD. five-days()88. We are sure the _ century will bring us more hopes.A. twentieth-firstB. twentieth-oneC. twenty-oneD. twenty-first()89. - What is 1/2 and 1/3?- It s _.A. 2/5B. 1/5C. 5/6D. 4/6()90. At the age of _,

27、 he had his own lab.A. thirtyB. thirtieth C. the thirtiethD. the thirty()91. Five times five is _.A. fiveB. zeroC. tenD. twenty-five()92. _are in the army. A. Two their sonsB. Their two sonsC. Their sons two D. Two sons their()93. My sister is a student of _.A. the First ClassB. Class OneC. One Clas

28、sD. Class First()94. The boy can count from one to _.A. hundred B. a hundred C. one hundreds D. hundreds ( )95. Their house is about _ as big as ours.A. times threeB. three timeC. time three D. three times()96. - Would you like some fruit, madam?- Oh, yes. _, please.A. 5 kilo bananas B. 5 kilos of bananas C. 5 kilo of bananas D. 5 kilos

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