高中英语语法复习--数词

1、数词,一、数词的分类:,主要分为基数词和序数词 表示数目多少的数词叫基数词 表示顺序的数词叫序数词,一 基数词、序数词：,二 分数、小数、百分数：,基数词在表示确切的数字时，不能使用dozen(12)、score(20)、hundred、thousand、million 、billion的复数形式；但是，当基数词表示不确切数字，如成百、成千上万，三三两两时，基数词则以复数形式出现。 two dozen eggs, three score of girls/three score days, six thousand hundreds of , dozens of , thousands of,

2、 tens of thousands of, millions of,基数词一般是单数形式，但下列情况，常用复数： a. 与of 短语连用，表示概数，不能与具体数目连 用，如scores of people 指许多人； b.在一些表示一排或一组的词组里； 如：They arrived in twos and threes. 他们三三两两的到达了。 c. 表示几十岁；in ones thirties d. 表示年代，用 in +the +数词复数；in the 1980s e. 在乘法运算的一种表示法里， 如：3 x 5 = 15 Three fives is (are) fifteen.,基数

3、词的句法功能,基数词在句中可作主语、宾语、定语、表语、同位语。 The two happily opened the box 两个人高兴地打开了盒子。（作主语） I need three altogether 我总共需要三个。（作宾语） Four students are playing volleyball outside 四个学生在外面打排球。（作定语） We are sixteen我们是16个人。（作表语） They three tried to finish the task before sunset 他们三个人尽力想在日落前完成任务。（作同位语）,序数词的句法功能,序数词在句中可作

4、主语、宾语、定语和表语。 The second is what I really need 第二个是我真正需要的。（作主语） He choose the second 他挑选了第二个。（作宾语） We are to carry out the first plan 我们将执行第一个计划。（作定语） She is the second in our class 在我们班她是第二名。（作表语）,序号表示法,（1）单纯的序号，可在基数词前加number,简写为No.。 如：No.1 第一号 （2）事物名词的序号表达法有所不同： 对于一些小序号可用序数词也可用基数词表达，形式分别为：the + 序数词

5、 + 名词 / 名词 + 基数词。 如：第一次世界大战可以表示为 the First World War = World War One, Lesson 8 = the eighth lesson 对于一些大序号我们通常只用一种表达法， 即名词 + 数词。 如：501号房间表示为 Room 501, 538路公共汽车表示为 Bus 538。 可用a / the + number + 基数词 + 名词。 如：a No.5 bus一辆五路公共汽车， the No.8 bus那辆8路公共汽车。,分数表示法,分数是由基数词和序数词一起来表示的。 基数词作分子，序数词作分母，除了分子是“1”以外，其它情

6、况下序数词都要用复数形式。 3/4 three fourths或three quarters 1/3 one third或a third 24/25 twenty-four twenty-fifths 3 1/4 three and one fourth或 three and one quarter 1/2 a half 1/4 one quarter或a quarter 1 1/2 one and a half 百分数用基数percent表示 50 fifty percent3 three percent 分数和百分数后面不能直接接名词或代词，而用以下形式：分数/百分数 of + the /

7、these/those/my+ 名词 / 代词, 其谓语动词与of后的名词在人称和数上保持一致，如： Two-thirds of the money was spent on food. Seventy percent of the earth surface is covered by water. One third of the students are from the town.,分数的其它表达形式：,分子与分母之间加in, 分子在前，分母在后，分子分母都用基数词。 如：one in ten 十分之一， five in eight八分之五。 分子与分母之间加out of , 分子在前

8、，分母在后，分子分母都用基数词。 如：one out of ten十分之一， five out of eight八分之五,小数表示法,小数用基数词来表示，以小数点为界，小数点左首的数字为一个单位，表示整数，数字合起来读；小数点右首的数字为一个单位，表示小数，数字分开来读；小数点读作 point，o读作 zero或o，整数部分为零时，可以省略不读. 0.4 zero point four或point four 零点四 10.23 ten point two three 十点二三 25.67 twenty-five point six seven 二十五点六七 l.03 one point o t

9、hree 一点零三,倍数的表达方式,once, twice, three times, four times （1）倍数用在as + 形容词 / 副词（原级）+ as结构之前。 They have three times as many cows as we do. （2）倍数放在形容词或副词的比较级之前或by + 倍数用在比较级之后。如：This rope is four times longer than that one. They produced more products in 2001 than those in 2000 by twice. The production of

10、grain has been increased by four times this year. （3）倍数用在表示度量名词前，其基本结构为： 倍数 + the +size/length/weight + of + 表示比较对象的名词， This room is three times the size of that one.,大约数的表示方法,（1）用dozen、score、hundred、thousand、million等数词的复数后加of短语来表示几十、几百、上千、成千上万等大约数概念。 （2）用less than、under、below、almost、nearly、up to 等来

11、表示小于或接近某数目。 He is good at English, so he can finish the paper in less than two hours. （3）用more than、over、above、beyond、or more等来表示超过或多于某个数目。如： Peking University has a history of more than 100 years. （4）用or、or so、about、around、some、more or less等表示在某一数目左右。 About 50 people were present at that time. （5）用

12、to、from to、between and表示介于两数词。如： His salary rises from 20 dollars a week to 35 dollars a week.,加减乘除表示法,1. “加”用plus，and或add表示； “等于”用is，make，equal等词表示。 2+3=? 可表示为：How much is two plus three? 2+3=5 可以用以下5种方式表达： Two plus three is five Two and three is equal to five Two and three make five Two added to t

13、hree equals five If we add two to/and three, we get five,2. 减用 minus或 take from表示 106?How much is ten minus six? 10-6=4 十减去六等于四 Ten minus six is four Take six from ten and the remainder is four. Six (taken) from ten is four,3. “乘”用time（动词）或multiply表示 3X4? How much is three times four? 3X4=12 Three t

14、imes four is/are twelve Three fours is/are twelve Multiply three by four，and we get twelve Three multiplied by four makes twelve 三乘以四等于十二,4. “除”用divide的过去分词形式表示 164=? How much is sixteen divided by four? 1644 Sixteen divided by four is four Sixteen divided by four equals/gives/makes four If you divi

15、de 16 by 4, you get 4. 十六除以四等于四。,数词考点及复习要点 虽然数词并不是近几年的考查重点，但我们在复习时还是需要搞清楚以下几个概念： 1、数词的基本用法及比较； 2、数词的位置； 3、倍数词的表达习惯； 4、在习惯用语中数词的用法；,数词的基本用法 考题点击1 It is not rare in _ that people in _ fifties are going to university for further education. (99上海) A. 90s, theB. the 90s, / C. 90s, theirD. the 90s, their,

16、D,表示“几十岁”；用 in ones + 数词复数，如： He began to work in his teens. 表示年代，用 in +the +数词复数；,数词的基本用法 考题点击2 _ of the land in that district _ covered with trees and grass. ( 2000上海) A. Two fifth, isB. Two fifth, are C. Two fifths, isD. Two fifths, are,C,分数和百分数作主语时，关键是看其后的名词来决定其谓语动词的数。该题中的是不可数名词，所以动词需用单数。,数词的基本用

17、法 考题点击3 Americans eat _ vegetables per person today as they did in 1910. (2002上海春) A. more than twice B. as twice as many C. twice as many as D. more than twice as many,D,倍数表示法：主+谓+倍数(或分数)+ as + adj. (+ n.) + asI have three times as many as you.,4._ people in the world are sending information by E-m

18、ail every day. A.Several million B.Many millions C.Several millions D.Many million 5. The number of people invited _ fifty, but a number of them _ absent for different reasons. A.were ; was B.was ; was C.was ; were D.were ; were,A,C,6. Shortly after the accident, two _ police were sent to the sport

19、to keep order. A. dozens of B. dozens C. dozen D. dozen of 7. _ of the land in that district_ covered with trees and grass. A. Two fifth; is B. Two fifth; are C. Two fifths; is D. Two fifths; are 8. It is said that the mountain is about _ high, through which the peasants dug a hole _ deep. A. 400 foot/six hundreds metres B. 400 foots/six hundred metres C. 400 feets/six - hundred - metre D. 400 feet/six- hundred metres,C,C,D,9. _ cave that George has discovered in his lifetime is near the Alps. A. The hundredth B. The hundred C. Hundredth D. A hundredth 10. The hero of the story is an art