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1、（一）数词表示数目多少或顺序多少的词叫数词。（二）数词的分类(一)基数词在英语中表示数目的词称为基数词。1.基数词的构成(1)1-20one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty(2)21-99先说“几十”,再说“几”,中间加连字符23→twenty-three,34→thirty-four,45→forty—
2、five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one(3)101—999先说“几百”,再加and,再加末两位数或末位数;586→fivehundredandeighty-six,803→eighthundredandthree(4)l,000以上,先从右往左数,每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“,”前为billion(美式)或thousand,million(英
3、式),然后一节一节地表示。1,001→onethousandandone9,785→ninethousand,sevenhundredandeighty-five18,423→eighteenthousand,fourhundredandtwenty-three6,260,309→sixmilliontwohundredandsixtythousandthreehundredandnine750,000,000,000→sevenhundredandfifty,billion(美式)sevenhundredandfiftyt
4、housandmillion(英式)2.基数词的用法(1)作主语e.g.FourOfthemcomefromParis.(2)作宾语e.g.一Howmanybookswouldyoulike?一Iwouldliketwo.(3)作表语e.g.Sevenminustwoisfive.(4)作定语e.g.Therearethreepeopleinmyfamily·(5)作同位语e.g.Youtwowillgoswimmingwithus.(6)表具体数字时,hundred,thousand,million用单数。e.g.Ther
5、earesixhundredstudentsinourgrade.(7)表不确定的数字时,数词用复数。若带名词,再加ofhundredsof(数百,成百上千的),thousandsof(数干,成千上万的),millionsof(数百万)e.g,Theyarrivedintwosandthrees.他们三三两两地来了。(8)表示“…十”的数词的复数可以表示人的岁数或年代。e.g.Heisinhisearlythirties.他有三十来岁(31—34岁):Thistookplaceinthe1930s.这事发生在二十世纪三十年代
6、;(9)表示时刻e.g.IwatchCCTVNewsatseveno’clockeveryevening.(二)序数词在英语中表示顺序、次序的词称为序数词。1,序数词的构成(1)一般在基数词后加the.g.four→fourth,thirteen→thirteenth(2)不规则变化one→first,two→second,three→third,five→fifth,eight→eighth,nine→ninth,twelve--twelfth(3)以y结尾的十位整数,变y为ie再加thtwenty→twentieth,f
7、orty→fortieth,ninety→ninetieth(4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。twenty-first,twohundredandforty-fifth2.序数词的用法(1)序数词作定语时,一般要与定冠词或物主代词连用。e.g.Tomistheirsecondson.Heisthefirstonetocomehere.(2)序数词有时可与不定冠词连用,表示数量上"又—",“再一”e.g:Hetriedasecondtime.他又试了—次.Shalll
8、askhimathirdtime?还要我再问他—次吗?我已问了他两次)(3)序数词的缩写形式为:阿拉伯数字加上这个词的末尾两个字母。1st2nd,3rd,4th,20th,21st,22nd,23rd(4表示年、月、日时,年用基数词,日用序数词。2005年8月15日:(英)15,8,200
