初中英语语法数词.docx

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-threethirty-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 hundred 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 six 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)熟记特殊词。常见的序数词：1st2nd3rd4th5th6th7th8th9th10th11th12thfirstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfth13th14th15th16th17th18th19ththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth20th30th40th50th60th70th80th90th100thtwentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetiethone 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1000thone thousandth, 1000000th one millionth., 第703the seven hundred and third, 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：1/5one fifth ; 2/3 two thirds ; 4/7 four sevenths ; 1/2 a half ; 1/4a quarter ; 3/4 three quarters ; 50% fifty hundredths ( fifty 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 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