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1、数词复习,数 词,基数词,序数词,数量,顺序,一.基数词、序数词,first,second,third,fourth,fifth,sixth,eighth,ninth,twelfth,twentieth,twenty-first,fortieth,one hundredth,one hundred and fifth,one hundred and twenty-ninth,nineteenth,基数词的构成,1）112, 独立成词。 one two three four five six seven eight nine ten eleven twelve 2）13-19, 由39 + te
2、en构成。 14fourteen 16-sixteen 17-seventeen 19nineteen 特殊拼写: 13 thirteen 15-fifteen 18eighteen 3）2090, 以-ty结尾。 20twenty 30-thirty 40forty 50fifty 80-eighty 60-sixty 70-seventy 90ninety 4）2199， 两位数，十位与个位之间有 “”。 21 twentyone 55 fiftyfive 99 ninetynine 5）101999，三位数，百位与十位/个位之间加and。 101 one hundred and one
3、840 eight hundred and forty 693 six hundred and ninety-three,29,431,500,7,6,thousand,hundred,million,billion,and,6) 1，000以上数目,从右向左每三位用“，” 分开,分别读为thousand , million, billion,基数词的构成,four thousand three hundred and twenty-one,seven million,six hundred and fifty four thousand three hundred and twenty-on
4、e,7,654,321,1,987,654,321,4321,4,321,one billion nine hundred and eighty-seven million,six hundred and fifty-four thousand three hundred and twenty-one,序数词的构成,1) 13, first, second, third 。 2) 419, 相应基数词+th, 特殊拼写:fifth, eighth, ninth, twelfth。 3) 2090, y变成ie +th,如twentieth。 4) 2199, 只把个位的基数词变成序数词 如tw
5、enty-first。 5) 序数词缩写-数字最后两字母 如1st, 2nd, 3rd ,4th,基变序,有规律, 一、二、三，特殊记，面目全非要注意， 加th从4起， 八少“t”，九去“e”， “ve”要用“f”替，(five, twelve) 见“y”变成“i”和“e”，词尾加上“th”， (twenty, thirty,ninety) 若是遇到几十几，只变个位就可以。 序数词缩写记清楚,数字后跟两字母。,(序数词构成规律),基数词的用法,1、表示具体数目,hundred, thousand, million不用复数 表示不确定数目,用复数。即hundreds of(数百),thousan
6、ds of(数千), millions of(数百万)+ 名词复数, 可以用many/several修饰，但不能与具体数目连用。,1. hundred thousand (表示具体数字) million billion 2. hundreds thousands (表示概数) millions billions,数词 (several)+,+ of,some / many hundreds of,1) Our country has a population of 1,300 million people. 2) There are three thousand students in our
7、 school. 3) After the war, thousands of people became homeless. 4) Several / Many thousands of trees must be planted every year.,1. If a = 3, b=4, whats the answer to the problem, a+2ab+1=? the answer is_. A. twenty eight B. twenty-eighth C. twenty-eight 2. In our school several _ students are able
8、to search the Internet . A. hunderd of B. hunderds of C. hundred,3. Many _ sheep were killed in the accident. A. thousands of B. thousand C. thousands 4. There are over nine _ workers in the factory, but _ of young people hope to work in it. A. hundred; hundreds B. hundreds; hundreds C. hundreds; hu
9、ndred,2、 “几十”的复数形式可以表示： 几十多岁 - in + ones + 数词复数 年 代 - in + the +数词复数 1) He died in his forties四十多岁 2) In the nineties, most people go to work by bike. 90年代,表示“在世纪”, 用序数词。 在20世纪 写作：in 20th century 读作：in the twentieth century,1. There will be more chances in _ century than in _ century. A. twenty-one,
10、 twenty B. twenty-first, twentieth C. the twenty-first, the twentieth 2. The city changed a lot _. A. in 1980s B. in the 1980s C. in the 1980,3. He graduated in _ of _ century. A. the sixtieth; twenty B. sixty; the twentieth C. the sixties; the twentieth 4. He got the prize _. A. in his fifties B. i
11、n fifties C. in his fifty,3、“基数词+名词” 的合成形容词作定语，中间有连字符“”,当中的名词用单数。 a 3 year old girl a seven-day holiday 4、表计量- “基数词+度量单位+形容词” The classroom is 7 meters long, 6 meters wide and 3 meters high.,5、表示时刻 (介词用at) 1)顺读法-先时后分, “几点几分” 9:30 nine thirty 6:21 six twenty-one,3) 15分钟：a quarter 30分钟：a half 9:15 a q
12、uarter past nine 12:30 half past twelve,2)逆读法-先分后时 表示“几点过几分”，半小时以内，介词用past 分钟数+past +钟点数 10:10 ten past ten 8:20 twenty past eight,表示“几点差几分”，半小时以上，介词用to 60减原分钟+ to + (下一个)钟点数 9:50 ten to ten 7:40 twenty to eight,one oclock,ten past two,half past three,twenty to five,a quarter past five,a quarter to
13、seven,seven fifty,表示在几点钟用介词 at,1 5,分子 基数词 分母 序数词,one fifth,2 7,分子 1 分母 + s,two sevenths,1 4,分子 a 分母 quarter,a quarter,3 4,three quarters,1 2,a half,1 3,three and one third,3,基数词 + and + 分数,6.分数百分数,80 %,基数词 + percent,eighty percent,half / (百)分数 + of + 可数名词复数 谓语动词用复数 half / (百)分数 + of + 不可数名词 谓语动词用单数,
14、3.78,three point seven eight,1. _ of the students _ boys in Class A. Two three; are B. Two thirds; are C. Two thirds; is 2. _ of her money _ spent on clothes. A. Two three; are B. Two thirds; is C. Two third; is 3. _ the teachers in our school is about one hundred, and _ of them are women teachers.
15、A. The number of; two third B. The number of ; two thirds C. A number of; two thirds,一个半小时 两个半小时,two and a half hours = two hours and a half,one and a half hours = one hour and a half,7. 半的表示法,1. The boy always stays there for _. A. one and half hour B. one and a half hour C. one and a half hours 2.
16、 The old man drank_ beer. A. two bottles and a half B. two and a half bottle C. two bottle and a half,一倍 once，两倍 twice， 三倍 three times (三倍或以上 基数词times),8. 倍数,This box is five times as big as that one. =This box is four times bigger than that one., A + be + 倍数 + as +adj.原+ as +B. A是B的 倍 C + be + 倍数 + adj.比+ than +D. C比D 倍,
