数词和量词2.ppt

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；　 They arrived in twos and threes.　 C. 表示年代，用 in +the +数词复数； This took place in the 1930s. 十八世纪三十年代→ 1730’s/1730s the seventeen thirties 二十世纪六十年代→1960’s/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 1960’s??(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 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——”。 We’ll go over it a second time． 我们得再念第二遍。 We’ve tried it three times．Must 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. / 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 quarters 1/3 one third或a third 24/25 twenty-four over twenty-five 22/9 twenty-one over nine 33/89 thirty-three over eighty-nine 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 1 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-fourths meters） 4/5 meter 五分之四米 5/6 inch 六分之五英寸 倍数的表达 Your library is twice bigger than ours. This car runs three 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 t