四、数词:基数词,序数词一、基数词
(1)1-20
one,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。
23twenty-three,34thirty-four,45fortyfive,56fifty-six,67sixty-seven,78seventy-eight,89eighty-nine,91ninety-one
(3)101999先说几百,再加and,再加末两位数或末位数;
586five hundred and eighty-six,803eight hundred and three
(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
1,001one thousand and one
18,423eighteen thousand,four hundred and twenty-three
6,260,309six million two hundred and sixty thousand three hundred and nine
750,000,000,000seven hundred and fifty billion
二、序数词
(1)一般在基数词后加th
eg.fourfourth,thirteenthirteenth
(2)不规则变化
onefirst,twosecond,threethird,fivefifth,eighteighth,nineninth,twelvetwelfth
(3)以y结尾的十位整数,变y为ie再加th
twentytwentieth, fortyfortieth, ninetyninetieth
(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
基数词转为序数词的口诀:
基变序,有规律,词尾加上-th.
一,二,三,特殊记,词尾字母t,d,d.
八去t,九去e, ve要用f替。
ty将y变成i,th前面有个e.
若是碰到几十几,前用基来后用序。
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