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1基数词序数词基数词（0-100）1one2two3three4four5five6six7seven8eight9nine10ten11eleven12twelve13thirteen14fourteen15fifteen16sixteen17seventeen18eighteen19nineteen20twenty21twenty-one22twenty-two23twenty-three24twenty-four25twenty-five26twenty-six27twenty-seven28twenty-eight29twenty-nine30thirty31thirty-one32thirty-two33thirty-three34thirty-four35thirty-five36thirty-six37thirty-seven38thirty-eight39thirty-nine40forty41forty-one42forty-two43forty-three44forty-four45forty-five46forty-six47forty-seven48forty-eight49forty-nine50fifty51fifty-one52fifty-two53fifty-three54fifty-four55fifty-five56fifty-six57fifty-seven58fifty-eight59fifty-nine60sixty61sixty-one62sixty-two63sixty-three64sixty-four65sixty-five66sixty-six67sixty-seven68sixty-eight69sixty-nine70seventy71seventy-one72seventy-two73seventy-three74seventy-four75seventy-five76seventy-six77seventy-seven78seventy-eight79seventy-nine80eighty81eighty-one82eighty-two83eighty-three84eighty-four85eighty-five86eighty-six87eighty-seven88eighty-eight89eighty-nine90ninety91ninety-one92ninety-two93ninety-three94ninety-four95ninety-five96ninety-six97ninety-seven98ninety-eight99ninety-nine100onehundred序数词：第1first第2second第3third第4fourth第5fifth第6sixth第7seventh第8eighth第9ninth第10tenth第11eleventh第12twelfth第13thirteenth第14fourteenth第15fifteenth第16sixteenth第17seventeenth第18eighteenth第19nineteenth第20twentieth第21twenty-first第22twenty-second第23twenty-third第24twenty-fourth第25twenty-fifth第26twenty-sixth第27twenty-seventh第28twenty-eighth第29twenty-ninth第30thirtieth第31thirty-first第32thirty-second第33thirty-third第34thirty-fourth第35thirty-fifth第36thirty-sixth第37thirty-seventh第38thirty-eighth第39thirty-ninth第40fortieth第41forty-first第42forty-second第43forty-third第44forty-fourth第45forty-fifth第46forty-sixth第47forty-seventh第48forty-eighth第49forty-ninth第50fiftieth第51fifty-first第52fifty-second第53fifty-third第54fifty-fourth第55fifty-fifth第56fifty-sixth第57fifty-seventh第58fifty-eighth第59fifty-ninth第60sixtieth第61sixty-first第62sixty-second第63sixty-third第54sixty-fourth第65sixty-fifth第66sixty-sixth第67sixty-seventh第68sixty-eighth第69sixty-ninth第70seventieth第71seventy-first第72seventy-second第73seventy-third第74seventy-fourth第75seventy-fifth第76seventy-sixth第77seventy-seventh第78seventy-eighth第79seventy-ninth第80eightieth第81eighty-first第82eighty-second第83eighty-third第84eighty-fourth第85eighty-fifth第86eighty-sixth第87eighty-seventh第88eighty-eighth第89eighty-ninth第90ninetieth第91ninety-first第92ninety-second第93ninety-third第94ninety-fourth第95ninety-fifth第96ninety-sixth第97ninety-seventh第98ninety-eighth第99ninety-ninth第100onehundredth2序数词下面把1－99的序数词分为四类:1、第一类first(1st)第一second(2nd)第二third(3rd)第三（在括号里的是缩写形式，均在阿拉伯数字后面加上相应序数词的最后两个字母构成，以下各类与此相同。）这类序数词只有三个，在整个序数词里面是特殊的，就和第一类基数词一样，需要逐个地硬记下来2、第二类：fourth(4th)第四fifth(5th)第五sixth(6th)第六seventh(7th)第七eighth(8th)第八ninth(9th)第九tenth(10th)第十eleventh(11th)第十一twelfth(12th)第十二thirteenth(13th)第十三fourteenth(14th)第十四fifteenth(15th)第十五sixteenth(16th)第十六seventeenth(17th)第十七eighteenth(18th)第十八nineteenth(19th)第十九hundredth（100th）第一百这一类序数词共有十七个。均在相应的基数词后面加上后缀－th构成。要注意其中fifth、eighth、ninth、twelfth四个词的拼法3、第三类：twentieth(20th)第二十thirtieth(30th)第三十fortieth(40th)第四十fiftieth(50th)第五十sixtieth(60th)第六十seventieth(70th)第七十eightieth(80th)第八十ninetieth(90th)第九十这一类全是十位整数的序数词，共八个。它们的构成方法是：先将相应的十位整数的基数词词尾－ty中的y改成i，然后在加上后缀－eth4、第四类：thirty-first(31st)第三十一sixty-second(62nd)第六十二eighty-seventh(87th)第八十七ninety-eighth(98th)第九十八这类表示“第几十几”的序数词，跟表示“几十几”的基数词一样简单。在构成方法上均由基数词“几十几”变化而来，十位数不变，仅把个位上的基数词变成序数词就行了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。两位数时则十位数用基数词，个位数用序数词，如：twenty-first。3基数词序数词对照表1onefirst1th2twosecond2nd3threethird3rd4fourfourth4th5fivefifth5th6sixsixth6th7sevenseventh7th8eighteighth8th9nineninth9th10tententh10th11eleveneleventh11th12twelvetwelfth12th13thirteenthirteenth13th14fourteenfourteenth14th15fifteenfifteenth15th16sixteensixteenth16th17seventeenseventeenth17th18eighteeneighteenth18th19nineteennineteenth19th20twentytwentieth20th21twenty-onetwenty-first21st422twenty-twotwenty-second22nd23twenty-threetwenty-third23rd24twenty-fourtwenty-fourth24th25twenty-fivetwenty-fifth25th26twenty-sixtwenty-sixth26th27twenty-seventwenty-seventh27th28twenty-eighttwenty-eighth28th29twenty-ninetwenty-ninth29th30thirtythirtieth30th40fortyfortieth40th50fiftyfiftieth50th60sixtysixtieth60th70seventyseventieth70th80eightyeightieth80th90ninetyninetieth90th100onehundredonehundredth100th基数词和序数词一．表示数目多少的词叫基数词：100以下的基本基数词100以上1-1011-1920-90100a/onehundred;1000a/onethousand;1,000,000a/onemillion;1,000,000,0001one11eleven20twenty2two12twelve30thirty3three13thirteen40forty4four14fourteen50fifty5five15fifteen60sixty6six16sixteen70seventy57seven17seventeen80eightya/onebillion（美）a/onethousandmillion(英)8eight18eightteen90ninety9nine19nineteen10ten二．表示顺序的数次叫序数词：基本序数词的构成1stfirst11theleventh2