1、英语语法体系数词（num.)数词的定义表示数目多少或者顺序多少的词，叫做数词，数词分为基数词和序数词基数词：表示数字或者数量多少，如：one,two,three,four序数词：表示顺序，“第”，如：first,second,third,fourth基数词的基本构成1-911-19整十几十几oneeleventen-twotwelvetwentytwenty-twothreethirteenthirtythirty-threefourfourteenfortyforty-fourfivefifteenfiftyfifty-fivesixsixteensixtysixty-sixsevensev
2、enteenseventyseventy-seveneighteighteeneightyeighty-eightninenineteenninetyninety-nine基数词的基本构成英语是千分位制，所以没有万、十万、千万、亿的概念100-百-hundred1,000-千-thousand1,000,000-百万-million1,000,000,0000-十亿-billion基数词的读法1、在读三位数或三位数以上的基数词十，需在十位数前（若十位数是“0”，在个位数前）加连词and。342-three hundred and forty-two1,342-one thousand,thre
3、e hundred and forty-two402-four hundred and two基数词的读法2、阿拉伯数字每三位数就需用一个“,”隔开，从后往前数。英语中没有“万”和“亿”，如何表达相关数字？1万可以用10千来表示，即10,000（ten thousand）100,000,000 可以写成 a hundred million25,485 可以写成 twenty-five thousand,four hundred and eighty-fivehundred,thousand,million与billion的用法1、与具体数词one,two或several,some,many 等
4、连用时，要用单数形式six hundred people600个人three thousand students3,000个学生many million books几百万本书hundred,thousand,million与billion的用法2、与of连用时，要用复数形式，但前面不能再加数词hundreds of people 成百上千的人thousands of students 成千上万的学生millions of books 数以千计的书序数词的基本构成第一至第十第十一至第二十第二十一至第三十第整十至第一百firsteleventhtwenty-firsttenthsecondtwel
5、fth twelvetwenty-secondtwentieththirdthirteenthtwenty-thirdthirtiethfourthfourteenthtwenty-fourthfortiethfifthfifteenthtwenty-fifthfiftiethsixthsixteenthtwenty-sixthsixtiethseventhseventeenthtwenty-seventhseventietheightheighteenthtwenty-eightheightiethninthnineteenthtwenty-ninthninetiethtenthtwenti
6、eth twentythirtieth thirtyhundredth数词的表达1、时间的表达 整点：seven oclock（7点）半点：half past seven（7点半）几点过几分：five past seven（7点零5分）九点过六分：six past nine差几分几点：five to seven（6点55分）8点55分：five to nine、7点40分：twenty to eight十五分钟：quarter数词的表达2、日期的表达年份用基数词，日期用序数词1985年5月1日写作：May 1(st),1985 读作：May the first,nineteen eighty-
7、five 写作：1(st)May,1985读作：the first of May,nineteen eighty-five数词的表达3、年代的表达in the 1930s读作：in the thirties of the twentieth century/in the nineteen thirties数词的表达4、年龄的表达at the age of eighteight years oldeight-year-oldin ones+整十基数词的复数形式，表示“在某人几十多岁时”。如：in his seventies 在他70多岁时数词的表达5、分数的表达分子用基数词，分母用序数词；当分子
8、大于1时，分母要用复数形式。one third 三分之一 one fourthone sixthtwo thirds 三分之二two fifthsthree seventhsa/one quarter 四分之一three quarters 四分之三three and one fourth 三又四分之一数词的表达8、倍数的表达表示两倍用twice，表示三火三以上的倍数用“基数词+times”。The room is twice as big as that one.这个房间是那个房间的两倍大。This tree is three times as tall as that one.这棵树是那棵树
9、的三倍高。数词的表达9、序数词前用the与a/an的区别“the+序数词”表示“第几”“a/an+序数词”表示“又一，再一”The apple is very sweet,and I would like a second one.苹果很甜，我想再吃一个。I ate two apples,and the second one is sweeter.我吃了两个苹果，第二个更甜。数词的表达10、another+基数词/基数词+more，表示“再，还”My father will stay in Shanghai for another two weeks.我爸爸将在上海再待两周。I need two more chairs.我还需要两把椅子。
