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3.数词

发布时间:2013-12-26 12:43:44  

数词

?

基数词

? 序数词

一、基数词

1)53 — fifty-three 21~99 的两位数,在十位数和个位数之间加连字符构成 2) 325 — three hundred and twenty-five 101~999 的三位数由 hundred 加 and 再加两位数 或末位数
3)五千个学生 five thousand students 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

巧记基数词
? ? ? ? ? ? ? ? ? ? ? 基数词不难记, 找清规律很容易, 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 ieth the twent y 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 ninety-third 第149 one hundred and forty-ninth “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, fifth, eighth, ninth, twelfth

三、其他几种数词

1)分数由基数词和序数词合成 基数词/序数词 1/3 a third 2/3 two thirds 分子大于1时,分母的序数词要用复数形式。 one and two-thirds 1又 2/3 one (a) half 1/2 one (a) quarter / one (a) fourth 1/4 three quarters 3/4 注意: 一年半 a year and a half
one and a half years

2.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: I’m eighteen now. 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) 10:20→ten twenty / 8:36→eight 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→ half past nine 7:05→ five past seven 3)表示几点差几分,用介词to,多用在半小时以上(不包括半 小时),也用倒读法。如: 8:50→ ten to nine 11:45→ a quarter to twelve 4)表示整点 8:00→eight(o’clock) 5)表示在某个钟点,用介词at。如: They begin to work at half past seven.

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 / 90’s / nineties

牛刀小试
1. Five hundred yuan a month _____ enough to live on. a. is b. are c. is being d. has been 2. ______ of the buildings were ruined. a. Three fourth b. Three four c. Three-fourths d. Three-four 3. The Olympic Games are held ______. a. every four years b. every four year c. every fourth years d. every four-years 4. 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!


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