1、Lesson 3 基数词 成千 thousands of )7. 表示“人的不确切岁数”，用几十的复数形式；He became a professor in his thirties. （他在三十多岁成为教授。）8. 表示年代时，用几十的复数形式；It was in 1960s. （那是在 20 世纪 60 年代。）二、序数词1、英语的序数词基本变法：(1) 1-19：一般在基数词后加 th特殊情况：one-fi rst ; two-second; three-third; eight-eighth; nine-ninth; -ve 结尾的改 ve 为 f 加 th；（如 five-fifth
2、； twelve-twelfth）(2)两位数（整数），改 y 为-ie ，加 th； (如 twenty-twentieth； thirty-thirtieth)（3）两位数/多位数（非整数），仅个位数部分用序数词。（如：thirty-sixth, fifty-third, one hundred and twenty-first）2.缩写形式：阿拉伯数字 + 序数词末尾两个字母 （只有 1st, 2nd, 3rd 为特殊形式，其他都是阿拉伯数字+ th） 来源:学科网 ZXXKfirst -1st； second-2nd; twentieth -20th; twenty-third -23
3、rd三、基数词/序数词用法辨别1. 基数词也可以表示顺序，要将基数词放在名词之后。来源: 学.科.网the first Lesson - Lesson One / the fifth page - Page 52. (1)序数词前面加 the 时,表示顺序,来源:学& 科&网This is the fourth time I come here. 这是我第四次来这儿。 (2) 加 a/an 时表示“再一、又一”Weve tried it three times. Must we try it a fourth time? 我们已经试过三遍了，还必须再试一次（第四次）吗？四、时间的数词表示法1.
4、 表示时刻（1）整点用“ oclock ”； （5: 00 读作 five oclock 或 five） （2）几点过几分，分钟 + past + 小时； （five past sev en 七点过五分； a quarter past eight 八点过一刻； half past eight 八点半）（3）几点差几分，分钟 + to + 小时；（ten to eight 八点差十分； a quarter to twelve 十二点差一刻（4）直接法：小时 + 分钟；（6: 31 读作 six thirty-one； 10:26 ten twenty-six）2. 表示日期，用 the 加序数词
5、表示，或用缩写形式12 月 1 日: Dec.1st 或 the first of December；2002 年 11 月 8 日: Nov. 8th, 2002.3. 表示年份，用基数词表示2002 读作 twenty thousand and two； 1976 读作 nineteen seventy-six4. 表示年代，用 the + 年代 + s/ s在 20 世纪 30 年代： in the 1930s 或 in the 1930s5. 表示世纪，用 the + 序数词 + century，或者 the + 整百 + s/s20 世纪： the 20th century 或 th
6、e 1900s/ the 1900s 五、分数/小数/百分数表示法1、分数表示法：基数词作分子，序数词作分母；分子是“1”时，序数词用单数；除此之外，序数词用复数1/3：one third / a third； 1/2：a half ； 1/4： one quarter ； 3/4：three fourths/ three quarters ； 1 ：one and a half22. “半”的表达：一半-a half； 半小时 half an hour； 1.5 小时one and a half hours 或 one hour and a half. 3. 当分数后接名词时，如果分数值大于
7、 1，名词用复数；小于 1，名词用单数。one and a half hours 一个半小时； two and three fourths meters 2.75 米3）小数：小数点左边合起来读，小数点右边的数字分开读，小数点读作 point10.25 -ten point two five / 1.03-one point o three4）10.25 -ten point two five / 1.03-one point o three4）百分数：用基数词+ percent 表示50%-fifty percent； 3% - three percent专项练习题1. Excuse me,
8、 how does this number 20,135 read? It reads_.A. twenty thousands one hundred and thirty-five. C. twenty thousand one hundred and thirty five.B. twenty thousand one hundred and thirty-five. D. twenty thousands, one hundred and thirty-five.2. Each year, _ fished are killed by the polluted water and ma
9、ny people are made sick by the polluted air.A. millions of B. million of C. two millions of D. two millions3. During the seven-day May Day holiday _ families went sightseeing.A. thousand B. thousands C. thousands and thousands D. thousands of4. The building has _ floors. They live on the _ floor.A.
10、ninth, last B. nine, nine C. nine, ninth D. nine , tenth5. The beautiful skirts are on show in the shop. Jane likes _.A. the ninth B. the nineth C. nine D. ninth6. December is the _ month of the year.A. twelve B. twelveth C. twelvitth D. twelfth7. I think that the _ century(世纪) will bring us more ho
11、pes.A. twenty-one B. twentiety-first C. twenty-first D. twentieth-one8. Now let me have _. A. the third try B. a third try C. third try D. this third try9. My sister is a student of _. A. the First Class B. Class One C. One Class D. Class First10. Shakespeare was born in _.A. 1660s B. 1660s C. The 1
12、660 D. The 1660s11. He became a super star _.A. In his thirty B. In his thirties C. At his thirty D. At his thirties12. _ of the students play QQ farm games on the Internet.A. 70 percent of B. 70 percent C. 70 percent of D. 70 percents13. The Olympic Games are held _.A. Every four years B. Every four year C. Every fourth years D.Every four-years14. Nowadays _ of business letters are written in English.A. Two third B. Two thirds C. Two three D. Second three
