1、,数词和量词,表示数目多少或顺序多少的词叫数词，数词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。 1.1 基数词写法和读法： 345 three hundred and forty-five,1. 基数词,1.2 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 , hundreds of, hundreds upon hundreds of, thousands of, tens of thousands of, millions of,b. 在一些表示“一排“或“一组“的词组里； The
2、y arrived in twos and threes.,数词的基本用法 It is not rare in _ that people in _ fifties are going to university for further education. A. 90s, the B. the 90s, / C. 90s, their D. the 90s, their,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；,C. 表示“年代“，用 in +the +数词复数；
3、This took place in the 1930s. 十八世纪三十年代 1730s/1730s the seventeen thirties 二十世纪六十年代1960s/1960s the nineteen sixties 八十年代初期the early eighties 九十年代末期the late nineties 二十世纪六十年代中期the mid 1960s (1960s)/the mid nineteen sixties,D. 表示年岁 He is in his early twenties. He died in his forties. She was by now in
4、his late thirties.,序 数 词,序数词的形式（P126）注：序数词在使用时，通常前面要加定冠词 the；但是如果序数词前出现不定冠词a或an时，则表示“再”，“又”。,Well go over it a second time我们得再念第二遍。Weve tried it three timesMust we try it a fourth time? 我们已经试过三遍了，还必须试一次（第四次）吗？,Both of the two rulers are broken. I want to buy a _one.A. three B. third C. forth D. /,B,
5、你还愿意再次来北京吗？ Would you like to come to Beijing a second time? 吃了两块蛋糕后，他又吃了一块。 After eating two cakes,he ate a third one.,分 数 词 及 其 他,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，其它情况下序数词都要用复数形式。,3/4 three fourths或 three quarters1/3 one third或a third24/25 twenty-four over twenty-five 22/9 twenty-one ove
6、r nine 33/89 thirty-three over eighty-nine,3 1/4 three and one fourth或 three and one quarter1/2 a half 1/4 one quarter或a quarter 1 1/2 one and a half1 1/4 one and a quarter,2. 当分数后面接名词时，如果分数表示的值大于1，名词用复数；小于1，名词用单数。 1 1/2 hours 一个半小时（读作 one and a half hours） 2 3/4 meters 二又四分之三米（读作two and three-fourt
7、hs meters）4/5 meter 五分之四米5/6 inch 六分之五英寸,数词的基本用法_ 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,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。,倍数的表达,Your library is twice bigger than ours. This car runs thr
8、ee times faster than that truck. Asia is four times as large as Europe. The plane flew ten times as high as the kite. My new glasses cost me half as much as the lost pair. If you give me a cookie, I will have twice as many as you.,This street is three times the length of that street There are five t
9、imes more books in our library than in yours We have produced twice more grain this year than we did last year After the technique was introduced，the factory produced twice as many tractors in 1988 as the year before There is three times as much water in this pot as in that one,倍数的表达,Your library is
10、 twice bigger than ours. This car runs three times faster than that truck. 倍数+形容词（或副词）的比较级+than,倍数的表达,Asia is four times as large as Europe. The plane flew ten times as high as the kite. My new glasses cost me half as much as the lost pair. If you give me a cookie, I will have twice as many as you.
11、倍数+as+形容词或副词（或 many / much） +as,This street is three times the length of that street 倍数+the size（length，height）of There are five times more books in our library than in yours We have produced twice more grain this year than we did last year 倍数+more+名词（可数，不可数）+than,After the technique was introduced，
12、the factory produced twice as many tractors in 1988 as the year before There is three times as much water in this pot as in that one 倍数+as many（或much）+名词 +as,总 结,倍数+形容词（或副词）的比较级+than 倍数+as+形容词或副词（或 many / much） +as 倍数+the size（length，height）of 倍数+more+名词（可数，不可数）+than 倍数+as many（或much）+名词 +as,倍数的其他表达
13、方式,“ times+that+of+被比对象 ”。如： In this workshop， the output of July was 4.5 times that of January. 这个车间7月份的产量是1月份的4.5倍。,“times+what+从句”。如： The production is now three times what it was ten years ago. 现在的产量比十年前增加了两倍。,倍数/百分数（percent）+compared with/up on +被比对象。如： Our factory s output of TV sets in the fi
14、rst six months of this year was 10% up compared with last year. 今年头六个月我们厂电视机的产量与去年相比增加了10%. The industrial output of last year in our factory was 35% up on that of 2001. 我们厂去年的工业产量比2001年增加了35%.,用double表示倍数 1. double用作形容词，表示“两倍的”。如： The production is now double what it was ten years ago. 现在的产量是十年前的两倍
15、。,double用作动词，表示“是的两倍。如： The output has been doubled in the past six years. 在过去六年中产量已经翻了一番。 This brought a steady rise in the grain yield. In 2002 it nearly doubled that of 1980. 这使粮食产量不断增长，到2002年产量已经比1980年翻了一番。,数量表示法,表示长、宽、高、面积等，用基数词+单位词（meter，foot，inch，kilogram等）+ 形容词（long，wide，high等）表示，或者用基数词+单位词
16、+ in + 名词（length， width， height， weight等）表示。,Two meters long Two meters in length Three feet high Three feet in height Four inches wide Four inches in width This box is 2 kilograms in weight.,exercises,1. Americans eat _ vegetable per person today as they did in 1910. A. more than twice B. as twice
17、as many C. twice as many as D. twice as much,D,2. Paper produced every year is _ the worlds production of vehicles. A. the three weight of B. three times the weight of C. as three times heavy as D. three times as heavier as,B,3.With the help of the German experts， the factory produced _ cars in 1993
18、 as the year before. A. as twice many B. as many twice C. twice as many D. twice many as,C,5. After the new technique was introduced， the factory produced _ tractors in 1988 as the year before. A. as twice many B. as many as C. as twice as many D. twice as many,D,4. This ship measures _ that one. A. as twice as long B. as twice long as C. twice long as D. twice as long as,D,
