九年级英语数词用法知多少

数词用法知多少
近几年的中考中，经常有涉及数词方面的知识,也是学生经常出错的地方。

本文就数词的用法作一归纳,供大家在复习中参考。

一、除了从1-12个基本数词（基数词）用不同的词表达外，从13-19
后都有-teen后缀。

如：
one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen，fourteen，fifteen，sixteen，seventeen，eighteen，nineteen
二、从20至90之间表整十的数词都跟后缀-ty。

如：
twenty，thirty，forty，fifty，sixty，eighty，ninety
表示“几使几”用整十加个位数构成，中间用连字符“-”。

如：twenty-one，thirty-two，forty-three，fifty-four，ninety-six
三、表示几百，几千，几百万，十亿用数词1-9加hundred，
thousand，million，billion构成。

如：
four hundred，five thousand，seven million，nine billion
注意：几百几十之间一般用and连接。

如：
three hundred and forty- nine，six hundred and seven
四、表示不确定的“数百”，“数百万”，“数千”，“数十亿”时，用
“hundreds”，“thousands”，“millions”，“billions”加“of”构成。

如：
There are hundreds of teachers in our school.
Thousands of students are studying in our school.
The mountain is covered with billions of trees.
五、表示顺序的词（序数词）除1-3外，其余的后面都有后缀-th。

如：
first，second，third，fourth，fifth，ninth，eleventh，twelfth 六、整十的序数词后面是由基数词变y为i，再加eth构成。

如：twenty→twentieth，eighty→eightieth，ninety→ninetieth
其余的整数加个位数构成的词，只变个位数为序数词即可。

如：twenty-nine→twenty-ninth，forty-five→forty-fifth，fifty-six→fifty-sixth，sixty-seven→sixty-seventh，ninety-seven→ninety-seventh
七、序数词前一般加定冠词the，但有时加不定冠词表示“又一”，
“再一”等。

如：
I have tried twice. I want to try a third time.
He has failed three times. He will try a fourth time.
八、数词与名词连用时，如几号，几班，几年级，房间号及邮编号
码时，首字母都大写。

如：
Number One，Class Three，Grade Two，Room 218，Zip Code 257091
九、表示倍数的大小时，两倍用twice表达，三倍以上用数词加
times表达。

如：
My school is twice as large as theirs.
Five times seven is 35.
十、分数的表达：分子基数词，分母序数词，分子大于1，分母加s。

如：
1/4→one fourth，3/4→three fourths（three quarters），1/5→one fifth，4/5 →four fifths
十一、小数的表达，小数点读作point，其余的按基数词读出。

如：
0.2 →zero point two，5.79 →five point seven nine
十二、百分数的表达，百分号读作percent。

如：
10%→ten percent，16%→sixteen percent，0.7% →point seven percent, 89%→eighty-nine percent
十三、数词算式表达：+→plus，－→minus，×→multiplied ÷→divided。

如：
5+7→five plus seven，9－3→nine minus three，8×9→eight multiplied by nine，64÷8→sixty divided by eight，6：5 →the ratio of six to five，42→four squared，33→three-cubed，54→the fourth power of five
十四、与数有关的几个常用单词及词组。

如：
half 一半，a dozen 一打，dozens of 几十，a score 二十，scores of 许多，several（a few），几个，数个
巩固训练
1.About ________ of the workers are young man.
A. third fifths
B. three fifths
C. three fives D three fifth
2. The computer of this kind can work _______ than that kind.
A. hundreds of times faster
B. hundred of times faster
C. hundred times faster
D. a hundred time faster
2.Two ____________ died of flu last year.
A. hundred old people
B. hundreds of old people
C. hundreds of people
D. hundreds old people
3.He graduated in _________ of __________ centrury.
A. the sixtieth; twenty
B. sixty; the twentieth
C. the sixties; the twentieth
D. sixty; twenty
4.The two great men wrote those letters in __________.
A. 1870’s
B. 1870s
C. the 1870’s
D. the 1870
5.I wonder if I can ask him ____________ time.
A. four
B. fourth
C. the fourth
D. a fourth 答案: 1---5 B A A C D。