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  1.基数词(1000以内的基数词的读法)   (1)1-20:one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen,seventeen,eighteen,nineteen,twenty   2.基数词变序数词的方法:   (1)一般在基数词后加th   eg.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th   twenty→twentieth, forty→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,two hundred and forty-fifth   口诀:   基变序,有规律;词尾要加th。   一二三,特殊记;词尾分别tdd。   八去t ,九去e ;ve则以f替。   ty 则变作 ti ; 后面还有一个e。   3.数词的应用:   A、时间:   a. 整点:基数词 + o’clock   eg. It’s eight o’clock now.   b. 几点几分:   1.直接表达法:先小时后分   eg. 3:25 three twenty-five   2.间接表达法:先分后小时   1)(<30分钟)用past :分钟past 小时   eg. 3:25 twenty-five (minutes) past three   2) (>30分钟)用to:(60-分钟数) to (小时数+1)   eg. 3:35 twenty-five (minutes) to four   3) 30分钟 = half 15分钟 = a quarter   eg. 3:30 three thirty = half past three   3:15 three fifteen = a quarter past three.   3:45 three forty-five = a quarter to four  
   B、日期表达法:月日,年(或日月年)   1949年10月1日 :   October1st , nineteen forty-nine   =the first of October, nineteen forty-nine   2000年: the year two thousand   =twenty hundred   2001年: twenty o one   3月1日: March the first = the first of March   C、表编号:   第207房间:Room 207   第五课: Lesson 5 = the fifth lesson   D、序数词与不定冠词(a; an)连用表“又一;再一”   eg. You’ve done it three times. Why not try a fourth time?   E、分数的表达:分子(基数)、分母(序数)   eg. one third 三分之一 two thirds 三分之二  
   注意:   1.分子超过1时,分母加s   2.含分数的短语作主语由分数后的词决定谓语   eg.1)One third of the students are girls.   2)One third of the milk is mine.   3.分数的特殊形式   1)one third = a third   2)one fourth = a quarter   three fourths = three quarters   3)one second = a half   F、表约数:   表不确定的数字时,数词用复数。   若带名词,再加of   如:hundreds of(数百,成百上千的),thousands of(数干,成千上万的),millions of(数百万的)   G、数学运算的表达   eg.3+5=8 Three plus/and five is eight.   9-2=7 Nine minus two is seven.   6x5=30 Five times six is thirty   8÷2=4 Eight divided by two is four.   
  
  
  
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