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：
练 习
( ) you go out at night, you’ll be able to see ____ starts.
A. thousands of B. thousand of
C. nine thousands of D. thousands
( )ay is ___ day of the week.
A. first B. the first
C. the second D. second
( )’ve done it twice. Why not try ____ time?
A. third B. the third C. a third D. once
( )h is the____ month? It’s September.
A. nine B. nineth C. ninth D. ninety
( )mber is ___ of the year.
A. the twelfth months B. the twelfth month
C. the twelveth months D. twelve months
( )e 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
( )’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
( ) time is it now? It’s ___ to six.
A. quarter B. a quarter C. quarto C. a quarto
( ) you be back in ____ ?
A. one or two minutes B. one minute or two
C. two minutes or one D. two or one minute
