数词用法知多少.doc

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1、 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, for

2、ty, 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 hu

3、ndred 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, thi

4、rd,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, eightyeightieth, ninetyninetieth 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-ninetwenty-ninth,forty-fiveforty-fifth,fifty-sixfifty-sixth,sixty-sevensixty-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

5、“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. Fi

6、ve 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 percen

7、t, 89%eighty-nine percent十三、数词算式表达:+plus,minus,multiplied divided。如: 5+7five plus seven, 93nine minus three, 89eight multiplied by nine, 648sixty divided by eight, 6:5 the ratio of six to five, 42 four squared, 33three-cubed, 54the 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

8、 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 fifth2. The computer of this kind can work _ than that kind.A. hundreds of times faster B. hundred of times fasterC. hundred times faster D. a hund

9、red time faster2. Two _ died of flu last year.A. hundred old people B. hundreds of old peopleC. hundreds of people D. hundreds old people3. He graduated in _ of _ centrury.A. the sixtieth; twenty B. sixty; the twentiethC. the sixties; the twentieth D. sixty; twenty4. The two great men wrote those letters in _.A. 1870s B. 1870s C. the 1870s D. the 18705. 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 D4

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