四、数词：1、分类：数词有基数词和序数词两种。

英语的数词可以作句子的主语、宾语、表语和定语。

2、基数词：表示数目的词叫基数词。

1thousand ,1000000→one million,→ten million, 0→one hundred million,108→one hundred and eight, 146→one hundred and forty-six, 500→five hundred , 1001→one thousand and one, 1813→one thousand eight hundred and thirteen.2、[注]：(1)百位与十位之间要加and；十万位和万位,亿位和千万位之间通常也要加and。

(2)英语用千、百万等单位计数,大数字从右向左看, 每隔三位划一逗号,倒数第一个逗号之前要用thousand,倒数第二个逗号之前要用million,倒数第三的逗号之前要用billion表示。

(3) hundred、 thousand、 million作数词时,不用复数,前面可以加上one,two, …等其它数词。

用作名词时复数表示“成…上…”,后面必须要有of,前面可以加上some,many,several等词。

如：five hundred(五百), hundredsof(成百上千的), ten thousand(一万), thousands of(成千上万的),millions of(成百万的)3、序数词：表示顺序的数词叫序数词。

1、英语的序数词基本变法：(1) 一般在基数词后加th,(2)-ve结尾的改为-fth,(3)-ty结尾的改为-tieth,(4)熟记特殊词。

2、序数词如下：1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th ※first※second※thirdfourthfifthsixthseventheighthninthtentheleventhtwelfth13th14th15th16th17th18th19ththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth20th30th40th50th60th70th80th90th100thtwentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetiethoneundredth21st22nd23rd35th101sttwenty-firsttwenty-secondtwenty-thirdthirty-fifthone hundred andfirst1000th→one thousandth, 1000000th→one millionth., 第703→the sevenhundred and third,第5480→the five thousand four hundred and eightieth.3、注：(1)两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词。

如：thirty-sixth,(2) 使用序数词时一般加定冠词the. 如：I’m in the third grade.(3) 序数词作“几分之几”讲时,有复数形式。

如：1/5→one fifth ; 2/3→ twothirds ; 4/7→ four sevenths ; 1/2→ a half ; 1/4→a quarter ; 3/4→ three quarters ; 50%→ fifty hundredths ( fifty per cent).4、数词的用法：1、表示年份：2002: twenty thousand and two ; 1976 : nineteen seventy-six.2、表示日期： 12月1日:或the first of December；2002年11月8日: Nov. 8th, 2002.3、表示时刻：5：15→ five fifteen或a quarter past five ; 8：30→ eight thirty或half past eight ; 10：45→ ten forty-five或a quarter to eleven.4、表示编号：Room 105→Room one 0 five; Bus →Bus Number Thirteen; →Page Five;Number seven-six-five-eight-six-five-nine5、小数的读法：→five point seven, →zero point one six.6、“半”的表达： 1/2→half, 半小时→half an hour, 小时→one and a half hours或one hour and a half.7、序数词前面加the时,表示顺序,加a/an时表示“再一、又一”。

如：The third lessonis rather difficult.(第三课相当难)/ Shall we read the text a third time(我们把课文读第三遍,好吗)数词一、基数词的写法和读法Ⅰ. 你能用英语写出下面的数字吗1. 8692. 1043. 1,230, 6184. 6,666,666,666 Ⅱ. 单项选择( ) 1. Last year girls took part in the competition but only few of them succeeded.A. ten millionsB. millions ofC. ten million ofD. ten millions of( ) 2. —Can you write the number one million, seven hundred and fifty-five thousand,six hundred and forty-six— Yes, it is .A. 1,755,646B. 10, 755, 646C. 17,055,646D. 1,705,646二、考查序数词的用法Ⅰ. 根据括号内的汉语提示完成句子，每空词数不限。

1. December is (十二) month of the year.2. Why do it (第二) time Let me give you a hand this time.3. The (第六) question is much more difficult than this one.Ⅱ. 单项选择( ) 1. — How old is your son— . We had a special party for his birthday last Sunday.A. Nine; nineB. Nine; ninthC. ninth; ninthD. Ninth; nine( ) 2. — Although you failed four times, I hope you can have try.— Thank you, I will.A. the fifthB. a fifthC. the fourthD. a fourth【指点迷津】1. 基数词变序数词：一二三要全变，其他-th加后面，8去t，9去e，5和12 ve变f，ty 要变tie。

2. 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 / an，则表示“再一、又一”。

三、考查分数Ⅰ. 写出下列分数。

1. 五分之四2. 二分之一3. 四分之三4. 一个半小时Ⅱ. 单项选择( ) 1. of the students in this school is 2000, and of them are girls.A. The number; first fourthB. The number; one fourthC. A number; one secondD. A number; three quarters( ) 2. is enough for me.A. One and a half hourB. One hour and halfC. One and half hourD. One and a half hours【指点迷津】1. 分数的写法：英语分数不费事，“母序子基”四个字。

分子若是大于一，分母还须加-s。

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。

四、考查年代、几十来岁、年、月、日和时刻的表达法Ⅰ. 单项选择( ) 1. — What is the date today—It’s .A. ThursdayB. June the sixteenthC. the best dayD. Monday( ) 2. — When were you born in Shanghai— .A. In January 1st, 1995B. On January 1st, 1995C. On 1995, January 1stD. In 1st January, 1995( ) 3. He began to work there in his .A. fiftiesB. fiftyC. fiftiethD. the fiftieth( ) 4. It’s ten to ten. We can also read it .A. nine fifteenB. nine fiftyC. ten past tenD. ten tenⅡ. 根据括号内的汉语提示完成句子。

1. My grandpa joined the party (在20世纪30年代).2. Every day he begins to do his homework at (7:10).【指点迷津】1. 英语中年月日的表达法和汉语中的不同，年在后，月日在前，如July 4th, 1973。

还要注意单纯年的表达法：一般分成两半来读，如1998 nineteen ninety-eight，但有一些比较特殊，如2000 two thousand；2008 two thousand and eight等。

2. 时刻的表达法一般有三种：一种是按顺序用基数词读，如：6:15 six fifteen；一种是在半小时以内（包括半小时），用分钟+past+小时，如6:15 fifteen past six；另一种是超过半小时，用（60﹣分钟）+to + (小时+1)，如：6:55 five to seven。