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数词

年级初二学科英语

内容标题数词

编稿老师刘虹

【本讲教育信息】

一. 教学内容:

数词

表示数字、数目和顺序次第的词叫数词。如one,first…数词分为基数词和序数词。基数词是表示数目多少的数词,如one,two等。序数词是表示顺序次第的数词,如first,second 等。

[教学过程]

一. 基数词

(一)基数词1-12是独立的单词。

例:one/two/three/four/five/six/seven/eight/nine/ten/eleven/twelve

(二)13-19基本上是在3-9后加-teen构成。但13,15,18有点特殊。

例:thirteen/fourteen/fifteen/sixteen/seventeen/eighteen/nineteen

(三)20-90的整十位数是在3-9后加-ty构成,但20,30,40,50有点特殊。

例:twenty/thirty/forty/fifty/sixty/seventy/eighty/ninety

(四)“几十几”是由十位数词加连字符“-”加个位数合成。

例:twenty-one/twenty-two

(五)英语中无“万”的单位,但有“百”、“千”、“百万”。表达方式如下:one hundred 一百one thousand 一千ten thousand 一万

one hundred thousand 十万one million 一百万

ten million 一千万

(六)三位数数词要在百位和十位之间加and.

例:365 three hundred and sixty-five

(七)1000以上的数字要先把数字分段,从后向前数每三位数空1/4格,倒数第一个空格前的数位为千(thousand),第二个空格前的数位为百万(million)。

例:47 635 848 forty-seven million six hundred and thirty-five thousand eight hundred and forty-eight.

注意:如果hundred,thousand,million前面有具体的数字,要用单数形式,但如果它们后面有of,则要用复数形式,且它们前面不可以再有表示具体数目的数词,表示“数百个”,“成千上万”。

例:three hundred students / hundred s of students

five thousand stars/thousand s of stars

二. 序数词

(一)序数词除了first,second,third有各自的形式外,其余的都是基数词上加-th构成,但以-y结尾的基数词要变y为ie再加th,以-ve结尾要变ve为f再加th。以-t结尾直接加-h。十位以上的基数词变成序数词时,只把个位数变成序数词即可,十位不变。变化口诀:8去t,9去e,ve变f,y变ie。

(二)序数词的缩写形式是由阿拉伯数字加上序数词的最后的两个字母构成。

例:1st/2nd/3rd/…

(三)部分基数词与序数词对照:

one—first two—second three—third four—fourth five—fifth six—sixth seven—seventh eight—eighth nine—ninth ten—tenth eleven—eleventh twelve—twelfth twenty—twentieth thirty—thirtieth forty—fortieth fifty—fiftieth sixty—sixtieth seventy—seventieth eighty—eightieth ninety—ninetieth twenty-one—twenty-first

thirty-seven—thirty-seventh one hundred—one hundredth

three thousand and one—three thousand and first

(四)序数词前若无物主代词或名词所有格,则要在序数词前加定冠词the;若表示“另一个”则加不定冠词a或an。

例:The Yellow River is the second longer river in China

三. 数词的用法

(一)数词在句中可以做主语、宾语、定语、表语、同位语。

例:The eighth of March is Women’s Day. (主语)

The two girls are sisters. (定语)

We three will go there tomorrow. (同位语)

I like the third better.(宾语)

(二)数词用来表示世纪、年代、日期

例:二十一世纪:the 21st century(用序数词表达)

九十年代:the nineties(用the加整十位的基数词复数表达)

20世纪90年代:1990s或1990’s (nineteen nineties)

1999年:nineteen ninety-nine (分二位读)

2000年:two thousand

1999年12月25日:December(the )twenty-fifth, nineteen ninety-nine

(三)时刻表示法

9:43 nine forty-three (时刻常用基数词读出)

整点:7:00 seven o’clock (o’clock可以省略)

表示“几点过几分”可用“分钟+past+小时”,但分钟必须在半小时以内,即小于30分钟。15分钟可用a quarter 表示,半小时可用half来表示。

例:ten past two, a quarter past nine, half past eight

表示“差几分几点”可用“分钟+to+小时”,同样分钟必须在半小时以内,即小于30分

钟。

例:差2分钟2点:two to two即:1:58

(四)各种号码表达法。(注意大写第一个字母且数词在后面)

例:Room 205,Class 5

(五)表示岁数。

例:My sister is sixteen.

(六)分数、小数、百分数的表达法。

分数表示法:分数由基数词和序数词一起构成。分子用基数词,分母用序数词,分子大于一时作为分母的序数词要用复数形式。

例:三分之一one third 十分之七seven tenths

小数表达法:小数点读做point,小数点后的数按单个基数词依次读出。

例:0.45 zero point four five

百分数表达法:由基数词加percent或per cent构成。

例:85% eighty-five per cent 15.23% fifteen point two three percent

【模拟试题】(答题时间:40分钟)

选择填空

1. More than two_______ years ago, people knew little about the universe.

A. thousands

B. thousands of C .thousand of D. thousand

2. Nearly nine _________trees have been planted along the lake since 1998.

A .hundred B. hundred of C. hundreds D. hundreds of

3. ________dollars is a lot of money.

A. Six thousand

B. Six thousands of

C. Six thousands

D. Six thousand of

4. Can you write the number eighty-five thousand six hundred and twenty-six?

A.85662

B.85626

C.58662

D.58626

5. It is over _________years since our Party was founded in 1921.

A. seventy

B. ninety

C. eighty

D. eightieth

6. There are usually ________days in a year.

A. three hundred sixty-five

B. three hundred and sixty-five

C. three hundred sixty five

D. three hundreds and sixty-five

7. I like ____best in this book.

A. Lesson One

B. Lesson First

C. the lesson one

D. first lesson

8. What time is it?

It’s__________.

A. forty-five past four

B. four past forty-five

C. forty-five four

D. fifteen to six

9. September is ___________month of the year.

A. nine B ninth C. the-ninth D. the ninth

10. It takes me ________to finish my homework every day.

A. a half and two hour

B. two hour and a half

C. two and a half hour

D. two and a half hours

11. Tom has collected about _______Chinese stamps.

A. two hundred forty-six

B. two hundred and forty-six

C. two hundred forty six

D. two hundreds and forty-six

12. How far is it from your home to your office?

_________walk.

A. Twenty minutes

B. Twenty minutes’

C. Twenty minute’s

D. Twenty-minutes

13. There are twenty boys in our class .________are from America.

A. Two they

B. The second C .Two of them D. The two of them

14. Mr. Smith has a ____son.

A .ten years old B. ten year old C. ten-years-old D. ten-year-old

15. Before he went to America, Mr. Li had learned __________English words.

A. hundreds of

B. hundred of

C. three hundreds

D. three hundreds of

16. Lucy wrote a __________letter to her mother.

A .six hundred words B. six-hundred words

C. six-hundred-word

D. six-hundred-words

17. Many people in the world speak English as ______ language.

A .the second B. second C. two D. a second

18. What date is it today?

It’s__________.

A .my birthday today. B. a fine day

C. Saturday

D. September 29,2002

19. How often do you go to visit your grandparents?

_________.

A. two time a month

B. twice a month

C. two times month

D. a month twice

20. _________here today.

A. There are only ten of us

B. We are only ten

C. There are only ten us

D. There are only ten

21. My birthday is on December________.

A. five

B. the fifth

C. fifth

D. the five

22. We can see ________stars in the universe at night.

A. millions

B. million

C. million of

D. millions of

23. They go to the cinema _________a month.

A .one B. once C. one time D. a time

24. Miss Gao lives in _________.

A. Room 603

B. the 603

C. 603 room

D. The room 603

25. Three weeks is not enough for me to write the book, I need _________ week.

A other B. the other C. a fourth D. fourth

26. _________of the storybooks on the shelf are interesting.

A. Two-thirds

B. Second-thirds

C. Two-third

D. Second-third

【试题答案】

1~5 DAABC 6~10 BADDD 11~15 BBCDA 16~20 CDDBA 21~25 BDBAC 26 A