数词分为基数词和序数词。用于表示事物数目的词称为基数词，表示事物顺序的词称为序数词。

　　1.基数词(1000以内的基数词的读法)

　　365-three hundred and sixty-five

　　505-five hundred and five

　　2.基数词变序数词的方法：

　　 基变序，有规律；词尾要加th。

　　 一二三，特殊记；词尾分别tdd。

　　 八去t ，九去e ；ve则以f替。

　　 ty 则变作 ti ; 后面还有一个e。

　　 要是遇到几十几；只将个位变成序。

　　eg. one-first two-second three-third

　　eight-eighth nine-ninth twelve-twelfth

　　twenty-twentieth

　　twenty-one --twenty-first

　　3.数词的应用：

　　A、时刻表达法：

　　a. 整点：基数词 + o'clock

　　eg. It's eight o'clock now.

　　b. 几点几分：

　　 1．直接表达法：先小时后分

　　 eg. 3:25 three twenty-five

　　 2.间接表达法：先分后小时

　　1)(<30分钟)用past ：分钟past 小时

　　eg. 3:25 twenty-five (minutes) past three

　　2) (>30分钟)用to：(60-分钟数) to (小时数+1)

　　 eg. 3:35 twenty-five (minutes) to four

　　3) 30分钟 = half 15分钟 = a quarter

　　eg. 3:30 three thirty = half past three

　　 3:15 three fifteen = a quarter past three.

　　 3:45 three forty-five = a quarter to four

　　B、日期表达法：月日，年（或日月年）

　　1949年10月1日 :

　　October1st , nineteen forty-nine

　　=the first of October, nineteen forty-nine

　　2000年: the year two thousand

　　=twenty hundred

　　2001年: twenty o one

　　3月1日: March the first = the first of March

　　C、表编号：

　　第207房间：Room 207

　　第五课： Lesson 5 = the fifth lesson

　　D、序数词与不定冠词(a; an)连用表"又一；再一"

　　eg. You've done it three times. Why not try a fourth time?

　　E、分数的表达：分子（基数）、分母（序数）

　　eg. one third 三分之一 two thirds 三分之二

　　注意：1.分子超过1时，分母加s

　　2.含分数的短语作主语由分数后的词决定谓语

　　eg.1)One third of the students are girls.

　　 2)One third of the milk is mine.

　　3.分数的特殊形式

　　1)one third = a third

　　2)one fourth = a quarter

　　 three fourths = three quarters

　　3)one second = a half

　　F、一些数词的复数 + of表约数：

　　hundreds of ; thousands of ; millions of

　　练 习

　　( )1.If you go out at night, you'll be able to see ____ starts.

　　A. thousands of B. thousand of

　　C. nine thousands of D. thousands

　　( )2.Monday is ___ day of the week.

　　A. first B. the first

　　C. the second D. second

　　( )3.You've done it twice. Why not try ____ time?

　　A. third B. the third C. a third D. once

　　( )4.Which is the____ month? It's September.

　　A. nine B. nineth C. ninth D. ninety

　　( )5.December is ___ of the year.

　　A. the twelfth months B. the twelfth month

　　C. the twelveth months D. twelve months

　　( )6.There are ___ floors in the building and he lives on the ____ floor.

　　A. eighteen, fifteen B. eighteenth, fifteenth

　　C. eighteen, fiveteen D. eighteen, fifteenth

　　( )7.I was born ___, 1982.

　　A. on June 2rd B. in June 2nd

　　C. on June two D. on June 2

　　( )8.It's ____ from our home to the zoo.

　　A. two and a half hours' walk

　　B. a half and two hours walk

　　C. two hours and a half hour's walk

　　D. two and a half hour's walk

　　( )9.What time is it now? It's ___ to six.

　　A. quarter B. a quarter C. quarto C. a quarto

　　( )10.Will you be back in ____ ?

　　A. one or two minutes B. one minute or two

　　C. two minutes or one D. two or one minute

　　( )11.Mary's uncle went to France ____.

　　A. in his thirties B. on his thirties

　　C. at his thirties D. about his thirties

　　( )12.The headmaster wrote a ___ report.

　　A. two thousand words B.two-thousand-words

　　C. two-thousand words D. two-thousand-word

　　( )13.____of the apples in the fruit bowl are soft and sweet.

　　A. Two-third B. Second-third

　　C. Two-thirds D. Second-thirds

　　( )14.We have learned about ____ these days.

　　A. several hundreds English words

　　B. hundreds of English words

　　C. hundred of English words

　　D. several hundred English word

　　( )15.A UN report says that the word population will pass six billion by the end of ____ century.

　　A. twentieth B. twenty

　　C. the twentieth D. the twentyth