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1、数词,Numerals,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。,什么叫数词?,2,1 基数词（ cardinal number）,1 one two three 4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten,11 12 13 14 15 16 17 18 19,eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen,20 30 40 50 60 70 80 90 100,tw
2、enty thirty forty fifty sixty seventy eighty ninety one hundred,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 + teen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 5
3、0fifty 60-sixty 70-seventy 80-eighty 90ninety 4）2199， 两位数，十位与个位之间有 “-”。 21 twenty-one 55 fifty-five 99 ninety-nine 5）101999，三位数，百位与十位/个位之间加and。 101 one hundred and one 840 eight hundred and forty 693 six hundred and ninety-three,5,29,7,hundred,and,基数词三位数 的构成,6,twenty-nine,729,hundred,and,seven,03,5,
4、hundred,and,再来一个,7,three,503,hundred,and,five,基数词三位数 的构成,8,hundred,and,百位数,十/个位数,four hundred and thirty-two,one hundred and seventy,eight hundred and sixty-five,one hundred and nine,109,432,170,865,作业,339,126,203,451,704,178,926,854,703,151,309,326,703,651,307,428,注： 1、1000以上几个的词，每三位数加一个逗号，第一个逗号前的数
5、为thousand，第二个逗号前的数为million（百万）, 第三个逗号前的数为billion（十亿），第四个逗号前的数为trillion（万亿） 888, 888，888，888，888 eight hundred and eighty-eight trillion, eight hundred and eighty-eight billion, eight hundred and eighty-eight million, eight hundred and eighty-eight thousand, eight hundred and eighty-eight,trillion tr
6、ljn 万亿 billion bljn 十亿 million mljn 百万 thousand aznd 千hundred hndrd 百,29,431,500,7,6,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 千 百万 十亿,基数词的构成,12,基数词的构成,6 500 431 729 six billion,five hundred million,four hundred and thirty-one thousand, seven hu
7、ndred and twenty-nine,four thousand, three hundred and twenty-one,seven million,six hundred and fifty four thousand, three hundred and twenty-one,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,1.
8、 hundred thousand (表示具体数字) million billion 2. hundreds thousands (表示概数) millions billions,三.基数词的用法,数词 (several)+,+ of,the/some / many/these/those hundreds of,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), thousands of(数千), millions of(数百万)+ 名词复数。 1) Our country has a po
9、pulation of 1,300 million people. 2) There are several thousand students in our school. 3) After the war, thousands of people became homeless.,作业,7046534210,178346790,1254321307,4283216547,6704653421,817034679,3120432130,9428320654,warming up 1. _ tress were planted on the mountain last year. A. Tho
10、usands of B. Thousand of C. Five thousand of D. Five thousands. 2_ of the students are girls in our class ATwo three BTwo threes CTwo thirds DSecond three 3.-When was he born? -He was born on _. A. second of October B. the October three C. October the second D. three of October,18,1. If a = 3, b=4,
11、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 about five _ students are able to surf the Internet . A. hunderd of B. hunderds of C. hundred,3. _ sheep were killed in the accident. A. Thousand of B. Thousand C. Thousands o
12、f 4. There are over nine _ workers in the factory, but _ of young people hope to work in it. A. hundred 0f; hundreds B. hundred; hundreds C. hundreds; hundred,5. people in the world are sending information by e-mail every day. A.Several million B.Many millions C.Several millions D.Many million,A,1 基
13、数词（ cardinal number）,序数词的构成,1) 13, first, second, third 。 2) 419, 相应基数词+th, fourth,fifth,sixth,seventh,eighth,ninth,tenth,eleventh,twelfth,thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth. 3) 2090, y变成ie +th, twentieth,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eighti
14、eth,ninetieth。 4) 2199, 只把个位的基数词变成序数词 如twenty-first,ninety-ninth 5) 序数词缩写-数字最后两字母 如1st, 2nd, 3rd ,4th,基变序,有规律,词尾加上“th”， 一、二、三，特殊记，结尾字母t,d,d 八去“t”，九去“e”，“f”要用ve替 见“y”变成“i”和“e”，词尾加上“th”， 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),24,一.基数词、序数词,first,second,third,fourth,fifth,sixth,eighth,ninth,twelft
15、h,twentieth,twenty-first,fortieth,one hundredth,one hundred and fifth,one hundred and twenty-ninth,nineteenth,练习,704653,11712,125,4280,16670465342,8170346791,4453216,94128654,作业,7046534210,178346790,1254321307,4283216547,6704653421,817034679,3120432130,9428320654,one oclock,ten past two,half past three,twenty to five,a quarter past five,a quarter to seven,seven fifty,表示在几点钟用介词 at,数词的表示法 时间,1. Its already 7:40 now. When will the film start? _. We still have five minutes. A. A quarter to seven B. A quarter to eight C. Seven past forty-five, 月日年 在1998年1
