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1、数词,基数词序数词,一、基数词,1)53 2199 的两位数,在十位数和个位数之间加连字符构成 2) 325 101999 的三位数由 hundred 加 and 再加两位数 或末位数 3)五千个学生 基数词 hundred, thousand , million, billion表示确 切数目时 不能加s; 但是:在表示不确切数目时,要用复数形式,如: hundreds of / thousands of students,fifty-three,three hundred and twenty-five,five thousand students,巧记基数词,基数词不难记,找清规律很容易
2、,十二以内词各异; 十三数到十九数去,后加-teen莫忘记。 二十 三十至九十,整十之后有-ty; 要说“几十几”,中间“-”号别丢弃, hundred是“一百”,请你记住莫大意。,二、序数词,2、序数词 1)他跑步得了第一。 He was the first in the race. 序数词一般由基数词后 + th构成,前面一般加定冠词the 2)第二十 the twent 以ty结尾的基数词构成序数词时,先把y改成i,再加eth 3)第93 第149 “二十”以上的多位数,个位数用序数词,其余仍用基数词。 4)不规则的序数词有以下几个: first, second, third, fift
3、h, eighth, ninth, twelfth,ieth,y,ninety-third,one hundred and forty-ninth,三、其他几种数词,1)分数由基数词和序数词合成 1/3 2/3 分子大于1时,分母的序数词要用复数形式。 1又 2/3 1/2 1/4 3/4 注意: 一年半,基数词/序数词,a third,two thirds,one and two-thirds,one (a) half,one (a) quarter / one (a) fourth,three quarters,a year and a halfone and a half years,2
4、.小数,点读point;“零”读o或zero;小数点后的数字按个位基数词依次读出。如: 0. 62-,zero point six two,3.百分数,由percent表示:29% -29 percent,四、数词在句中的作用 1、主语: Two of them are teachers. The third is green. 2、定语: There are fifty students in our class. They live on the third floor. 3、宾语: Give me two. Give me the second. 4、表语: Im eighteen no
5、w. You are the first to speak at the meeting. 5、同位语: You may leave it to us two. 6、状语: This room is one-sixth larger than that one.,五、时刻表示法 1、钟点 1) 10:20ten twenty / 8:36eight thirty-six 正读法按时间表上的数字读;先读钟点数,后读分钟数 2)表示几点过几分在半小时以内(包括半小时),用介词 past,时钟数在介词的后面,采用倒读法。如: 9:30 7:05 3)表示几点差几分,用介词to,多用在半小时以上(不包
6、括半 小时),也用倒读法。如: 8:50 11:45 4)表示整点 8:00eight(oclock) 5)表示在某个钟点,用介词at。如: They begin to work at half past seven.,half past nine,five past seven,ten to nine,a quarter to twelve,六、时间表示法 2、日期 1)年代用基数词,在某年要用介词in。如: He was born in 1983. (1983读成nineteen eighty-three) 2)月份首字母要大写,在某月也用介词in,如果有年代出现, 在月份名后加年代,中间
7、用逗号。如: It happened in January, 1999. (这事发生在1999年1月。) 3)日期用序数词(序数词前加the),在某日用介词on。如: on the first ;on the eighteenth 美国说法:顺序为先月后日。如: May 4(th)(五月四日 读成 May the fourth) 4) 年月日同时出现时,年代位于最后,其前加逗号。如: Mary was born on January lst, 1990. 5) 表示“在几十年代”用 in + the + 逢十的数词复数。如: in the 1990s / 90s / nineties,牛刀小试
8、1. Five hundred yuan a month _ enough to live on. a. is b. are c. is being d. has been2. _ of the buildings were ruined. a. Three fourth b. Three four c. Three-fourths d. Three-four3. The Olympic Games are held _. a. every four years b. every four year c. every fourth years d. every four-years4. As he is not in good health, he goes to his factory only _ just to learn something about the production. a. once a week b. one week c. one time a week d. one a week,Thank you!,