1、数词(一)分类:数词有基数词和序数词两种。可以作句子的主语、宾语、表语和定语。1、基数词:表示数目的词叫基数词。常用的基数词有:123456789101112onetwothreefourfivesixseveneightnineteneleventwelve13141516171819thirteenfourteenfifteensixteenseventeeneighteennineteen2030405060708090100twentythirtyfortyfiftysixtyseventyeightyninetyone(a) hundred23355691101twenty-thre
2、ethirty-fivefifty-sixninety-oneone hundred and one注:(1)百位与十位之间要加 and;百位为 0 的话,就加在百位和个位之间。108one hundred and eight, 146one hundred and forty-six, 500five hundred , 1001one thousand and one, 1813one thousand eight hundred and thirteen.一千: 1000one(a)thousand, 一万: 10,000ten thousand,十万: 100,000one hundr
3、ed thousand , 百万: 1,000,000one million,千万: 10,000,000ten million, 亿: 100,000,000one hundred million,(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。3,456,789three million four hundred and fifty- six thousand seven hundred and eighty-nine6,004,001 si
4、x million four thousand and one(3) hundred、 thousand、 million 表示确切的数时,不加 s。如:five hundred(五百),加S 时表示不确定的数,后面必须要有 of ,前面可以加上 some, many, several 等词,翻译为:“成上” 。hundreds of(成百上千的 ), thousands of(成千上万的), millions of(成百万的)2、序数词:表示顺序的数词叫序数词。 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
5、)熟记特殊词。常见的序数词:1st2nd3rd4th5th6th7th8th9th10th11th12thfirstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfth13th14th15th16th17th18th19ththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth20th30th40th50th60th70th80th90th100thtwentieththirtiethfortiethfiftiethsixtieths
6、eventietheightiethninetiethone undredth21st22nd23rd35th101sttwenty-firsttwenty-secondtwenty-thirdthirty-fifthone hundred and first口诀: 基变序,有规律,词尾加上-th,一,二,三,特殊记,词尾字母 t,d,d八去 t,九除 e,ve 要用 f 替,ty 将 y 变成 tie 若是碰到几十几,前用基来后用序1000th one thousandth, 1000000th one millionth., 第 703the seven hundred and third
7、, 第 5480the five thousand four hundred and eightieth.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)序数词前要加定冠词 the. 如:Im 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 two thirds ; 4/7 four sevenths ; 1/2 a half ; 1/4 a quarter ; 3/4 three quarters ; 50% fifty hundredths ( fifty
8、 per cent).(二) 、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: Dec.1st 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 No.13 Bus Number Thirteen; P.5 Page Five; Tel.No.7658659 Telephone Number seven-six-five-eight-six-five-nine5、小数的读法:5.7 five point seven, 0.16 zero point one six.6、 “半”的表达: 1/2half , 半小时half an hour, 1.5 小时one and a half hours 或one hour and a half.