1.基数词用于表示事物的数量，在表示基数词时，要特别注意hundred, thousand, million, billion等几个词的用法：若其前用了基数词，则不论其面是否有of，都必须用单数形式(此时若带of则通常表示特定范围中的一部分)；若泛指数百、数千、数百万等，则用 hundreds of, thousands of, millions of 等这样的结构。如：
Two hundred of the students are needed to plant trees this morning.
今天中午需要200个学生去植树。
Hundreds of people attended the famous director’s farewell concert.
好几百人出席了这位著名指挥家的告别音乐会。
Thousands upon thousands of English words come from foreign tongues.
成千上万英语单词来自外来语。
2. 基数词的复数用法
逢整“十”的基数词的复数形式可用于表示某人的大约年岁和世纪中的年代。如：
The war broke out in the nineties.
这次战争爆发于90年代。
Karl Mark began to learn the Russian language in his fiftieth.
马克思五十多岁开始学俄语。
3. 序数词的用法
序数词用于表示事物的顺序，一般由与之相应的基数词加th构成(但有特殊形式需特别记忆)；序数词主要用作定语，前面一般要加定冠词(或物主代词)。如：
Their second son is a doctor.
他们的二儿子是个博士。
The hundredth cave that George has discovered in his lifetime is near the Alps.
乔治一生中找到的第一百个山洞在阿尔卑斯山附近。
注：序数词前有时可用不定冠词，表示“每一，又一”。如：
We’ll have to do it a second time.
我们将再做一遍。
基变序口诀 ：基变序有规律 ，
词尾加上-ed(fourth,sixth)
一、二、三，特殊记，
结尾字母t,d,d(first,second,third)
八去t,九去e,(eighth,ninth) ；
ve要用 f替;(fifth,twelfth) ；
ty将y改成i, th前面有个e；
若是碰到几十几，
只变个位就可以。
或记忆为：一、二、三，特殊记，
词尾字母t,d,d ，
八加h,九减e,逢十改y为ie ，
f要把ve替，还有th莫忘记。
基数词序数词练习题I. Choose the best answer
( )1. Please turn to ______.
A. Page 11 B. the 11 st page
C. page 11 D. page the 11 th
( )2. At night we can see ______ stars in the sky.
A. thousands and thousands of
B. thousand and thousands of
C. a thousand and thousands
D. thousand and thousand
( )3. There are some _____ in our classroom.
A. hundred of books
B. the hundreds of books
C. hundreds of books
D. hundred of book
( )4. I have been to the village _____
A. a hundred time
B. hundred times
C. hundreds of times
D. hundred of times
( )5. There are ____ students in our school.
A. four—hundred and forty—five
B. four hundred and forty—five
C. four hundreds and forty—five
D. four hundred and forty five
( )6. The teacher told me to go over _____ lessons.
A. thirst three
B. the three first
C. three the first
D. the first three
( )7. May is ____ of a year.
A. the fifth months
B. the fifth month
C. the five months
D. the five month
( )8. We live in ______.
A. the twenty-first century
B. the century twenty-one
C. century twenty-one
D. the century twenty-first
( )9. He said he was going to be free in _____
A. one and a half hour
B. one hour and half
C. one and half hours
D. an hour and a half
( )10. ---How many English books are there on the table?
---There is only _____English book on it.
A. a B. an C. one D. the
( )11. Mr Smith stayed in _____ last night.
A. Room 403 B. the Room 403
C. the 403 room D. 403 the room
( )12. The road is _____
A. two thousand and five hundred metres long
B. two thousands metres long
C. long one thousand five hundred metre
D. a thousand and five hundreds metres long
( )13. He joined the army on _____ of May 1980.
A. 1 st B. the 1 C. first D. the first
( )14. Is Sunday the ____ day of the week?
A. a B. one C. once D. first
( )15. March the _____ is Women’s Day.
A. eighth B. ninth C. tenth D. eight
( )16. September is the _____month of the year.
A. nineth B. ninth
C. nine D. the twelveth
( )17. December the ____ is Christmas.
A. twenty-five B. twenty-fifth
C. twentieth-five D. twenty-five
( )18. Another way of saying Lesson 12 is ______
A. Lesson ten-two
B. Lesson Ten-second
C. the Twelfth Lesson
D. Twelfth lesson
II. Complete the sentences according to the numerals: (用past或 to的句型)
1.What time is it ? (8:30)
It’s ______________________
2. What is it ? (9:15)
It’s _______________________
3. What time is it ? (7;45)
It’s ________________________
4. What was the date ? (1893年1月26日)
It ______________________
III. Translate the following into English:
1. 电话号码8485308 ________________
2. 第六十四中学 ___________________
3. 成千上万的儿童 _________________
4. 两个月半 _______________________
5. 45路公共汽车 ________________
6. 三分之一 _______________________
7. 五分之四 __________________
8. 第501房间 _____________________
9. 第二层 ________________________
10. 第三次 ______________________
11. 第五册 _______________________
12. 两周半 ____________________
13. 他每天早上总是第一个到校。
_____________________________
14. 第三天早上玛丽没有迟到。
______________________________
15. 这本书我昨晚读了20页。
_______________________________.
16. 最近的医院离他们学校约4—5公里。
____________________________
17. 在二十世纪三十年代 ____________
18. 中华路21号__________________
答案I. 选择题
1—5. AACCB 6—10. DBADC 11—15. DADDA 16—18. BBC
II. 完成句子：
1. It’s half past eight.
2. It’s a quarter past nine.
3. It’s a quarter to eight.
4. It was January twenty-sixth eighteen ninety-three.
III. 翻译短语和句子：
1. Telephone number/ Tel. No. eight four eight five three o eight
2. No. Sixty-four Middle School
3. thousands of children
4. half and two months/ two months and a half
5. No. 45 bus/ Bus 45
6. one third
7. four fifths
8. Room 501
9. the second floor
10. the third time
11. Book V
12. half and two weeks/ two weeks and a half
13. He is always the first to get to school every morning.
14. The third day Mary wasn’t late
15. I read so pages of the book yesterday evening.
16. The nearest hospital is about four to five kilometers from their school.
17. in the 1930s
18. 2 Zhonghua Road
