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精心整理精心整理各位家长：从本学期的第二单元起，孩子开始接触英语的序数词。之前孩子接触的数词都是基数词，现阶段可能会有一些混淆与不熟练。本学期必须掌握的序数词为【第1-第12】，其中【第1、2、3】尤其重要，必须会背会默。不过在今后的各种练习题中，可能会出现12以外的序数词，为了方便孩子查阅使用，我整理了1-100的序数词，并列出对应基数词。怕有误会，再说明一次：并不需要100个序数词全背出或默出，有要求的只有前12，其他的只要用时查看即可（但是对之后的构成规律必须有所了解）1-100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-fifth1-100基数词：1one2two3three4four5five6six7seven8eight9nine10ten11eleven12twelve13thirteen14fourteen15fifteen16sixteen17seventeen18eighteen19nineteen20twenty21twenty-one22twenty-two23twenty-three24twenty-four25twenty-five26twenty-six27twenty-seven28twenty-eight29twenty-nine30thirty31thirty-one32thirty-two33thirty-three34thirty-four35thirty-five精心整理精心整理第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64sixty-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-first36thirty-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-one精心整理精心整理第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100onehundredth82eighty-two83eighty-three84eighty-four85eighty-five86eighty-six87eighty-seven88eighty-eight89eighty-nine90ninety91ninety-one92ninety-two93ninety-three94ninety-four95ninety-five96ninety-six97ninety-seven98ninety-eight99ninety-nine100onehundred1－100的序数词分为四个类。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)第十九这一类序数词共有十六个。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、twelth四个词的拼法。精心整理精心整理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－eth。4、第四类：thirty-first(31th)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。