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1、精选优质文档-倾情为你奉上基数词和序数词详细讲解基数词英语中数词分为两大类:基数词和序数词。、基数词定义:描述事物数量的多少的数词称为基数词。二、基数词的构成 (1)112独立成词。(2)1319,+teen构成。(3)整十的,以ty结尾。(4)2199,两位数,十位与个位之间有“一”。eg:31thirty-one 66 sixty-six 99 ninety-nine (5)101999,三位数,百位与十位/个位之间加andeg:840 eight hundred and forty 693 six hundred and ninety-three 101 one hundred and
2、one(6)1000以上的数目,从后向前数,每三位用“,”隔开,从后往前分隔号读thousand,million,billion。8, 300, 531, 628l l lbillion million thousand三.基数词的用法1、表示具体数目,hundred,thousand,million不用复数;表示不确定数目,用复数。 hundreds of(数百),thousands of(数千),million of (数百万)+名词复数,但不能与具体数目连用。eg:There are three thousand students in our school.eg:After the w
3、ar,millions of people became homeless.2、“几十”的复数形式可以表示:(1)在某人几十多in+ones+数词复数在几十年代in+the+年份复数eg: in his forties.在他40岁时.(2)In the 1990s(在二十世纪90年代)3、“基数词+名词”的合成形容词作定语,中间带有连字符“”,当中的名词用单数。eg :a 3-year-old girl a ten-day holiday4、表计量“基数词+度量单位+形容词”eg:The classroom is 8 meters long,7 meters wide and 4 meters
4、 high.序数词一、序数词定义:序数词是指表示顺序的数词.二、序数词的构成(1)13,特殊记, first,second,third.(2)419,相应基数词尾+th,特殊拼写fifth,eighth,ninth,twelfth。(3)2090整十的,y变成ie+th,eg:twentieth。(4)2199,只把个位的基数词变成序数词,eg:21 twentyfirst,59 fifty-ninth(5)序数词缩写数字+最后两字母eg:1st,2nd,3rd,4th.三、序数词构成规律基变序,有规律,词尾加上th,1,2,3,特殊记,词尾字母t,d,d,5和12好兄弟,ve要用f代替,8加
5、h,9去e,见y把y变ie,若是遇到几十几,只变个位就可以。四、序数词的用法。(1)序数词作定语,前面要加the;eg:I live on the third floor.She is my first pen friend.(2)有时a/an,“再一”,“又一”eg:Well learn a second language next year.Weve done three times,we want to try it a fourth time.五、编号表示法编号在前,名词在后,用序数词,前面有the。eg:第一课 the first lesson名词在前编号在后,用基数词,注意首字母大写。eg:第一课lesson One房间号码和电话号码要一个一个分别读。第305房间 Room 305第3路公共汽车 Bus No.39六、分数表示法分子用基数词,分母用序数词。分子大于一,分母+s1/4 one fourth a(one)quarter3/4 three fourths three quarter2/3 two thirds1/2 a(one)half 专心-专注-专业
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