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小学英语复习指导:基数词和序数词
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。
23→twenty-three,34→thirty-four,45→forty—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“,”,先进个“,”前为thousand。第二个“,”前为million,第三个“,”前为billion
1,001→onethousandandone
18,423→eighteenthousand,fourhundredandtwenty-three
6,260,309→sixmilliontwohundredandsixtythousandthreehundredandnine
750,000,000,000→sevenhundredandfiftybillion
序数词
(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,twohundredandforty-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。