1、基数词的构成及用法构成一、基数词的构成 1 1-12 的表述 1-12 各有各的形式，即one，two ，three，four，five，six，seven，eight，nine ，ten ，eleven ，twelve。 2 13-19 的表述 13-19 的数字皆以 -teenti：n结尾，其中，fourteen，sixteen，seventeen，eighteen 和 nineteen 分别由 four，six，seven，eight ，nine加后缀-teen 变成的，eighteen 中只保留一个 t。thirteen，fifteen 分别由 three 和 five 转花而来。 3
2、 20-90 数字的表达 20-90 的数字皆以 -ty 结尾，其中，sixty ，seventy ，eighty，ninety 分别由 six,seven,eight 和 nine 加后缀 ty 构成，eighty 中只保留一个 t。其他同上。4 20-99 之间的数字的表达 20-99 之间的数词须在十位和个位之间加连字符“-”，如twenty-five。 5百位以上的数字的表达以及读在表达百位以上的数字时，必须在百位，十位和个位之间加 and，在读音时也应读上 and，如：104 可表达为 one hundred and four，486 读作 four hundred and eigh
3、ty-six。 6 “万”的表达.英语中没有万和亿单词，只有百（ hundred），千（thousand），百万（million），十亿（billion）。英语中表示“万”时，用 10 千。如：forty thousand 四万。表示“亿”时需用百万来表示。如：two hundred million 两亿。 7 7.1， 000 以上的数字，从后向前数。每三位数加“，”。第一个“，”前为 thousand,第二个“，”前为 million,第三个“，”前为 billion.3,333,333,333 读为 three billion,three hundred and thirty-three
4、 million, three hundred and thirty-three thousand,three hundred and thirty 8.hundred,thousand,million 前有若有具体数字时，要用单数形式，但如果他们后面有 of ,则要用复数形式。同时，前面不能再加具体的数目。二、基数词的用法 (1) 基数词在句中主要用作主语、宾语、定语、表语、同位语，例如：Thirty of them are Party members.（主语） - How many would you like？ -Three ， please（作宾语） The nine boys are
5、 from Tianjin.（定语） Six plus four is ten.（表语） We four will go with you.（同位语） (2) 表示一个具体数字时，hundred, thousand, million 不用复数；表示一个不确定数字时则用复数。例如： Our country has a population of 1,300 million people. There are three thousand students in our school. After the war, thousands of people became homeless. Maiz
6、e is the most important food crop for millions of people in the world. They arrived in twos and threes (3) 表示“十”的数词的复数形式可用来表示人的岁数或年代， 例如： He is in his early thirties He died still in his forties This took place in 1930s (4) 表示时刻用基数词。例如：We get up at six. The workers begin work at eight. 表示“几点过几分，用 pa
7、st,但须在半小时以内。例如： ten past ten, a quarter past nine, 表示“几点差几分用 to, 但分数须在半小时以上。例如：twenty to nine a quarter to ten 表示几点几分 用基数词。例如：seven fifteen, eleven thirty, nine twenty 序数词的构成及用法 一、序数词的构成 1 第一，第二，第三分别为 first,second,third. 2 第四到第十九都有相应的基数词加 the 构成，有几个特殊，即 fifth,eighth,ninth,twelfth. 3第几十把 y 改为 i 加 eth
8、 twentieth,ninetieth 4 序数词之前要加定冠词或代词。但序数词表名词时，可不用冠词。Who won first? 序数词表“再一”，“又一”时不用定冠词，只需在前面加a He failed once .Then he tried a second time. 5 序数词的缩写形式是在数字后面直接加上序数词最后两个字母构成。1st,2nd,3rd,4th,21st,22nd,34th 6 100 以上的序数词的表示方法 第 100 为 100th (读作 one hundredth),101st 读作one hundred and first,其他的依次类推 二. 序数词的用
9、法 （1 ）序数词主要用作定语，前面要加定冠词， 例如： The first truck is carrying a foot baskets John lives on the fifteenth floor（2 ）序数词有时前面可加不定冠词 a 来表示再，又这样的意思， 例如： Well have to do it a second time Shall I ask him a third time？ When I sat down，a fourth man rose to speak （3 ）注意不规则形式： one-first, two-second, three-third, fiv
10、e-fifth, eight-eighth, nine-ninth, twelve-twelfth。 （4）表示年，月，日时， 年用基数词表示，日用序数词表示。 例如： 1949 年十月一日读作: October (the) first, nineteen sixty 2004 年九月十日读作：September (the) tenth, two thousand and four （5 ） 表示分数时，分子用基数词表示，分母用序数词表示。分子大于 1 时，分母加-s 。 例如： three fourths, one second, two fifths （6 ）序数词缩写形式： first1
11、st second2nd third3rd fourth4th twenty-second22nd 分数的表示法 1 分数的表示法：分子用基数词，分母用序数词，当分子大与一时，分母用复数形式。2|3 two thirds 3|5 three fifths 2 整数与分数之间用 and 连接。 One /an hour and a half 3 分数的用法结构为“分数+of+the+名词”表示“。的几分之几”，当其作主语时，谓语动词的单复数取决于短语中名词的复数1. About _ students in our class can describe that place in English.
12、 2.A. three-fifths B. three-fifth C. third-five D. third-fifths 2. Nine _ pounds a week?Thats very good. A. hundred of B. hundreds of C. hundreds D. hundred 3. We often have sports after class, and I like to play _ basketball. A. a B. an C. the D. 不填 【中考演练】 一. .单项填空 1. This morning I had _ egg and a
13、 bottle of milk for my breakfast. A. an B. a C. the D./ 2. -Whats the matter with you? -I caught _ bad cold and had to stay in _. A. a;/ B. a; the C. a; a D. the; the 3. -Have you seen _ pen? I left it here this morning. -Is it _ black one? I think I saw it somewhere.A. a; the B. the; the C. the; a
14、D. a; a 4. _ sun is shining brightly. A. A B. An C. The D. / 5. There is _ “h” in the word hour. A. a B. the C. an D./ 6. Did you enjoy your stay in Xian? Yes. I had _ wonderful time. A. a B. an C. the D. / 7. _ sun is bigger than _ earth. A. A; the B. A; an C. The; an D. The; the 8. There is _ appl
15、e and some pears on the table. A. the B./ C. a D. an 9. David has _ cat. Its very nice. A. a B. an C. the D./ 10.Im reading _ novel. It is _ interesting story. A. a; an B. a; a C. the; the D. /; an 11. It is said that SARS has killed more than _ people worldwide. A. three hundreds B. three hundreds
16、C. three hundreds D. three hundred 12. -How many workers are there in your factory? -There are two _. A. hundreds B. hundred C. hundred of D. hundreds of 13. -Which is the smallest number of the four? -_. A. Two-thirds B. A half C. A quarter D. Three-fourths14. -What do you think of a war, Li Ming?
17、-Iveno idea. But its a fact that _ people had to leave their hometown during the War on Iraq. A. three thousands B. thousand of C. thousands of D. several thousands 15. We all think that the _ century will bring us more hopes. A. twenty-first B. twentieth-first C. twenty-one D. twentieth-one 16. -Ca
18、n you write the number eighty-five thousand, six hundred and twenty-six? -Yes, it is _. A. 856620 B. 85626 C. 58662 D. 58626 17. When was the PRC founded? It was founded on _. A. July 1, 1921 B. October 1, 1949 C. August 1, 1927 D. May 1, 1922 18. I was 8 years old when my father was 31. This year m
19、y father is twice my age. How old am I?A. 21 B. 22 C. 23 D. 24 19. _ Chinese are looking for ways to learn English well before Beijing 2008 Olympics. A. Thousand B. Thousands C. Thousand of D. Thousands of 20. Both of the two rulers are broken. I want to buy a _one. A. three B. third C. forth D. / 数
20、词跟踪练习1. There are _ days in a year.A. three hundreds and sixty-fiveB. three hundred and sixty fiveC. three hundred and sixty-fiveD. three hundreds and sixty-five2.The volunteers sent _ books to a mountain village school on Childrens Day.A. two hundreds of B. two hundred of C. two hundreds D. two hun
21、dred3.I went to college in _ and began to work in _.A. the 1990s; twentyB. the 1980s, twentiethC. 1980; my twentiesD. 1980s, my twenties4.Audrey Hepburn passed away peacefully in her_ (sixty).5. The earthquake happened on the _(20) of April.6. December is the _(twelve) month of a year.7.We had a big
22、 family celebration on my grandpas _(ninety)birthday.8. On January 9th this year, London Underground celebrate its _(one hundred and fifty) birthday.9.Two thirds of the water_(be)polluted.10.Two thirds of students _(like)football.11. About _of the students in Grade Nine this year were born in the_.A
23、. three five; 1996. B. three fifths; 1990s C. third fifth; 1997. D. third fifths; 1990s 12. There are days, in a week and Tuesday is _ day of the week.A. seven ,third B. seven ,the thirdC. seventh ,three D. the seventh, three 13. Please turn to Page _ and look at the _ picture in this unit.A. twenti
24、eth; one B. Twenty; oneC. twentieth; first D. Twenty; first14. - How was your weekend?- Great! It was my grandfathers _ birthday. We enjoyed ourselves.A. seventy B. seventiethC. the seventieth D. seventeenth15. The chairperson received about three _ applications to join the Bird watching Club.A.hund
25、red B. hundreds ofC. hundred of D. hundreds16. He wrote his _ novel when he was _.A. five; fifties B. fifth; fiftyC. fifth; fiftieth17. _ visitors come to Xingyi during May Day holidays every year. A. Thousands of B. Two thousands C. Thousand of D. Thousand18. About _of the students in Grade Nine th
26、is year were born in the_.A. three five; 1996. B. three fifths; 1990s C. third fifth; 1997. D. third fifths; 1990s用所给词的适当形式填空1 They live on the _(five) floor.2 On my sisters _(nine) birthday, I gave her a useful book.3 _ (hundred) of people come here to read books on weekends.4 About two _(thousand)
27、 trees have been planted along the river.5. Three _ (four) of the students in our class like basketball.6 Fathers Day is on the _(three) Sunday of June.7 They live on the _ (twentysix) floor of the tall building.8 In the _ (eight) picture, you can see many young trees.9 He left his parents when he was _ (seven) years old.10 Its the _ (thirty) song that he has written.11 My _ (one) name is Linda. What about yours?12 She became very famous in her _ (forty)13. Three quarters of fruit juice _(eat) by him just now.
