英语基数词与序数词对比表1 one一；1st first第一2 two二；2nd second第二3 three十；3rd third第三4 four四；4th fourth第四5 five五；5th fifth第五6 six六；6th sixth第六7 seven七；7th seventh第七8 eight八；8th eighth第八9 nine九；9th ninth第九10 ten十；10th tenth第十11 eleven十一；11th eleventh第十一12 twelve十二；12th twelfth第十二(twelve变ve为f加th)13 thirteen十三；13th thirteenth第十三14 fourteen十四；14th fourteenth第十四15 fifteen十五；15th fifteenth第十五16 sixteen十六；16th sixteenth第十六17 seventeen十七；17th seventeenth第十七18 eighteen十八；18th eighteenth第十八19 nineteen十九；19th nineteenth第十九20 twenty二十；20th twentieth第二十(twenty变y为ie加th)21 twenty-one二十一；21st twenty-first第二十一23 twenty-three二十三；23rd twenty-third第二十三25 twenty-five二十五；25th twenty-fifth第二十五27 twenty-seven二十七；27th twenty-seventh第二十七29 twenty-nine二十九；29th twenty-ninth第二十九30 thirty三十；30th thirtieth第三十32 thirty-two三十二；32nd thirty-second第三十二34 thirty-four三十四；34th thirty-fourth第三十四36 thirty-six三十六；36th thirty-sixth第三十六38 thirty-eight三十八；38th thirty-eighth第三十八40 forty四十；40th fortieth第四十50 fifty五十；50th fiftieth第五十60 sixty六十；60th sixtieth第六十70 seventy七十；70th seventieth第七十80 eighty八十；80th eightieth第八十90 ninety九十；90th ninetieth第九十100 one hundred一百；100th（one）hundredth第一百101 one hundred and one一百零一；101st（one）hundredth and first第一百零一321 three hundred and twenty-one三百二十一；321st three hundred and twenty-first第三百二十一999 nine hundred and ninety-nine九百九十九；999th nine hundred and ninety-nineth第九百九十九1，000 one thousand一千；1,000th (one)thousandth第一千1，001 one thousand and one一千零一；1,001st (one)thousand and first第一千零一4，321 four thousand hundred and twenty-one四千三百二十一；4,321st four thousand hundred and twenty-first第四千三百二十一9，999 nine thousand nine hundred and ninety-nine九千九百九十九；9,999th nine thousand nine hundred and ninety-nineth第九千九百九十九10，000 ten thousand一万；10,000th ten thousandth第一万10，001 ten thousand and one一万零一；10,001st ten thousand and first第一万零一54，321 fifty-four thousand three hundred and twenty-one五万四千三百二十一；54,321st fifty-four thousand three hundred and twenty-first第五万四千三百二十一99，999九万九千九百九十九99，999th ninety-nine thousand nine hundred and ninety-ninth第九万九千九百九十九100，000 one hundred thousand十万100，000th one hundred thousandth第十万100，001 one hundred thousand and one十万零一100，001st one hundred thousand and first第十万零一654，321 six hundred and fifty-four thousand three hundred and twenty-one六十五万四千三百二十一654，321st six hundred and fifty-four thousand three hundred and twenty-first第六十五万四千三百二十一999，999 nine hundred and ninety-nine thousand nine hundred and ninety-nine九十九万九千九百九十九999，999th nine hundred and ninety-nine thousand nine hundred and ninth第九十九万九千九百九十九1，000，000 one million一百万1，000，000th one millionth第一百万1，000，001 one million and one一百万零一1，000，001st one million and first第一百万零一7，654，321 seven million six hundred and fifty-four thousand three hundred and twenty-one 七百六十五万四千三百二十一7，654，321st seven million six hundred and fifty-four thousand three hundred and twenty-first第七百六十五万四千三百二十一9，999，999 nine million nine hundred and ninety-nine thousand nine hundred and ninety-nine九百九十九万九千九百九十九9，999，999th nine million nine hundred and ninety-nine thousand nine hundred and ninety-ninth第九百九十九万九千九百九十九10，000，000 ten million一千万10，000，000 ten millionth第一千万10，000，001 ten million and one一千万零一10，000，001st ten million and first第一千万零一87，654，321 eighty-seven million six hundred and fifty-four thousand three hundred and twenty-one八千七百六十五万四千三百二十一87，654，321st eighty-seven million six hundred and fifty-four thousand three hundred and twenty-first第八千七百六十五万四千三百二十一99，999，999 ninety-nine million nine hundred and ninety-nine thousand nine hundred and ninety-nine九千九百九十九万九千九百九十九99，999，999th ninety-nine million nine hundred and ninety-nine thousand nine hundred and ninety-nineth第九千九百九十九万九千九百九十九100，000，000 one hundred millon一亿100，000，000th one hundred millonth第一亿100，000，001 one hundred millon and one一亿零一100，000，001st one hundred millon and first第一亿零一987，654，321 nine hundred and eighty-seven million six hundred and fifty-four thousand three hundred and twenty-one九亿八千七百六十五万四千三百二十一987，654，321st nine hundred and eighty-seven million six hundred and fifty-four thousand three hundred and twenty-first第九亿八千七百六十五万四千三百二十一1，000，000，000 one billion十亿1，000，000，000th one billionth第十亿（一）基数词：表示数目的词为基数词，它的构成如下表：（二）序数词：表示顺序的数词为序数词，它的构成如下表：基数词变序数词口诀英语中基数词变为序数词时，一般在基数词后加词尾-th，但有几个词变化特殊，只要记住下面这个口诀，这些问题即可迎刃而解。

一、二、三，单独记；八去t，九除e， ve要用f替，整十基数变序数，先把ty变成tie；要是遇到两位数，十位基数个位序，th最后加上去。

解析口诀：one→first，two→second，three→third这三个词变化特殊，要单独记；eight→eighth，nine→ninth，八去t，九去e后再加-th；five→fifth，twelve→twelfth，五、十二把ve换成f再加-th；twenty→twentieth，thirty→thirtieth...整十先把词尾y改为ie再加-th。