序数词

序数词OrdinalNumber定义•序数词是指表示顺序的数词。•在汉语中表示为“第几”•要与基数词区别开来（表示数目的词称为基数词。）序数词一般是由基数词后加-th变化而来。four（四）---fourth(4th)第四six（六）---sixth(6th)第六seven（七）---seventh(7th)第七ten（十）---tenth(10th)第十eleven（十一）---eleventh(11th)第十一thirteen（十三）---thirteenth(13th)第十三fourteen（十四）---fourteenth(14th)第十四fifteen（十五）---fifteenth(15th)第十五sixteen（十六）---sixteenth(16th)第十六seventeen（十七）---seventeenth(17th)第十七eighteen（十八）---eighteenth(18th)第十八nineteen（十九）---nineteenth(19th)第十九特殊的基数词:•one(一)-----first(第一)•two(二)---second(第二)•three(三)----third(第三)five(五)--fifth(第五)twelve(十二)--twelfth(第十二)eight(八)----eighth(第八)nine(九)----ninth(第九)整十的序数词把y变成i加-eth1twenty(二十)----twentieth(第二十)2thirty(三十)----thirtieth(第三十)3forty(四十)----fortieth(第四十)4fifty(五十)-----fiftieth(第五十)5你能写出sixtyseventyeightyninety的序数词吗？你对了吗？•1.Sixty----sixtieth•2.seventy---seventieth•3.eighty----eightieth•4.ninety----ninetieth几十几的序数词，十位数不变，个位数变成序数词。•1.twenty-one21(二十一)•twenty-first21st(第二十一)•2.thirty-two32(三十二)•thirty-second32nd(第三十二)•3.ninety-nine99(九十九)•ninety-ninth99th(第九十九)•4.请写出66834855的序数词。你做对了吗？•sixty-six-----sisty-sixth•eighty-three----eighty-third•forty-eight-----forty-eighth•fifty-five----fifty-fifth基数词变序数词的口诀基变序，有规律词尾加上th，(fourth,sixth)一、二、三，特殊记八去t，九去e(eighth,ninth)ve要用f替(fifth,twelfth)ty将y改成i(twenty----twentieth)th前面有个e(fifty---fiftieth)若要碰到几十几前用基来后用序(twenty-four--twenty-fourth)序数词的缩写形式有时，序数词可以用缩写形式来表示。主要缩写形式有：first——1stsecond——2ndthird——3rdfourth——4thtwentieth——20thtwenty-third——23rd其中lst，2nd，3rd为特殊形式，其它的都在阿拉伯数字后加上th。Exercise•一、写出下列基数词的序数词。seven－two－sixteen－one－three－eight－nine－twelve－twenty－five－thirty－fifty—twenty-two—thirty-five－twenty-eight—twenty-four－thirty-one－twenty-nine－•二、写出下列序数词的缩写形式或完整形式。•first－nineteenth－twenty-eighth－eleventh-twelfth-3rd－20th－80th－29th－2nd—•三、根据句子意思填空。1.Children’sDay（儿童节）isontheofJune（六月）.2.Teacher’sDay(教师节)isontheofSeptember（九月）.3.TheMid-autumnFestivalison(八月十五)inlunarcalendar.5.Nationaldayison(十月一日).firsttenththefifteenthofAugustthefirstofOctober•1.Mayis____ofayear.A.thefifthmonthsB.thefifthmonthC.thefivemonthsD.thefivemonth•2.Welivein______.A.thetwenty-firstcenturyB.thecenturytwenty-oneC.centurytwenty-oneD.thecenturytwenty-first•3.Hejoinedinthearmyon______ofMay1980.A.1B.the1C.firstD.thefirstBAD四、选择填空题•4.IsSundaythe____dayoftheweek?A.aB.oneC.onceD.first•5.March_____isWomen’sDay.A.eighthB.ninthC.tenthD.eight•6.Septemberisthe_____monthoftheyear.A.ninethB.ninthC.nineD.thetwelfth•7.December____isChristmas.A.twenty-fiveB.twenty-fifthC.twentieth-fiveD.twenty-five•8.AnotherwayofsayingLesson12is__________.A.Lessonten-twoB.LessonTen-secondC.theTwelfthLessonD.TwelfthlessonDABBCHomework1.默写序数词1-20。2.默写序数词23,34,39,20,30,40,50,60,70,80,90。