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1、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。1）、 英语中常用的基数词有：123456789101112onetwothreefourfivesixseveneightnineteneleventwelve13141516171819thirteenfourteenfifteensixteenseventeeneighteennineteen2030405060708090100twentythirtyfortyfiftysixtyseventyeightyninetyone(a) hundred2335101
2、twenty-threethirty-fiveone hundred and one1000one(a) thousand, 10000 ten thousand,100000one hundred thousand , 1000000one million,10000000ten million, 100000000one hundred million,108one hundred and eight, 146one hundred and forty-six, 500five hundred , 1001one thousand and one, 1813one thousand eig
3、ht hundred and thirteen. 2)、注意：(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), hun
4、dreds of(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：1st2nd3rd4th5th6th7th8th9th10th11th12thfirstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfth13th14th15th16th1
5、7th18th19ththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth20th30th40th50th60th70th80th90th100thtwentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetiethone hundredth21st22nd23rd 35th 101st twenty-firsttwenty-secondtwenty-thirdthirty-fifthone hundred and first1000th
6、one thousandth, 1000000th one millionth., 第703the seven hundred and third, 第5480the five thousand four hundred and eightieth.3)、注意：(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：Im in the third grade.(3) 序数词作“几分之几”讲时,有复数形式。如：1/5one fifth ; 2/3 two thirds ; 4/7 four sevenths ;
7、1/2 a half ; 1/4a 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: 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 thi
8、rty或half past eight ; 10：45 ten forty-five或a quarter to eleven.4）、表示编号：Room 105Room one 0 five; Bus No.13Bus Number Thirteen; P.5Page Five; Tel.No.7658659Telephone 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. 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 lesson is 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？)
