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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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