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1专题复习---数词表示数目和顺序的词叫数词。数词可以分为基数词和序数词。一、基数词用来表示数目，或者说表示数量的词叫基数词。最基本的基数词如下表所示：1one11eleven100a/onehundred2two12twelve20twenty1,000a/onethousand3three13thirteen30thirty1,000,000a/onemillion4four14fourteen40forty10,000,000tenmillion5five15fifteen50fifty100,000,000a/onehundredmillion6six16sixteen60sixty1,000,000,000a/onebillion7seven17seventeen70seventy8eight18eighteen80eithty9nine19nineteen90ninety10ten说明：1.11-19是由个位数加后缀-teen构成。注意12,13,15,18的拼写。2.20-90（整十）是由个位数加后缀-ty构成。注意20,30,40,50和80的拼写。3.其他非整十的两位数（21-99）是由整十数加连字符“-”，再接个位数构成。Eg.35:thirty-five79:seventy-nine81:eighty-one4.101—999先写百位数，后加and，再写十位数和个位数。（百位与十位之间必须加and）Eg.108:onehundredandeight691:sixhundredandninety-one5.1001及以上数字：数字从右往左看，每隔三位划一逗号，倒数第一个逗号前加thousand,倒数第二个逗号前加million，倒数第三个逗号前加billionEg.1,954:onethousandninehundredandfifty-four712,564,301:sevenhundredandtwelvemillionfivehundredandsixty-fourthousandthreehundredandone812,067,331,991:eighthundredandtwelvebillionsixty-sevenmillionthreehundredandthirty-onethousandninehundredandninety-one6.“hundreds”,“thousands”,”millions”后加of表示大量的不确定的数目：Eg:hundredsofpeople数以百计的人thousandsoftrees成千上万的树而表示确定的大量数目则直接用基数词，其后不加s，也不加of:Eg:twohundredstudents两百个学生fivethousandyears五千年二、序数词序数词用来表示数词的顺序，除特殊情况外，序数词一般都是直接在基数词后直接加后缀-th构成。（见下表）2第一到第十第十一到第十九第二十以上firstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenthtwentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetiethhundredththousandth说明：1.英语表示第一、第二、第三的序数词属于特殊形式：firstsecondthird2.–ve结尾的改为fth3.–ty结尾的改为tieth4.两位数以上的序数词，仅个位数部分用序数词，其余部分仍用基数词。Eg.fifty-first(第五十一)forty-eighth(第四十八)6.使用序数词时一般在前面加定冠词the，如：I’minthethirdgrade.但当名词前有物主代词、指示代词修饰时，the一定要省略。如：inhisthirdyear7.序数词可缩写为阿拉伯数字加序数词最后两个字母。Eg.第一(the)first(1st)第二(the)second(2nd)第三(the)third(3rd)第九十七(the)ninety-seventh(97th)第一百零一(the)onehundredandfirst(101st)8.编了号的事物要用基数词表示顺序，但是基数词要后置。第三十二页：Page32第305房间：Room305第五课：LessonFive第12路公汽：BusNo.12课堂练习：一、写出下列数字1.622.743.274.595.126.137.1138.2759.40310.68011.第8512.第11113.第1814.第4915.888888888816.999999999999二、选择适当的单词填空。1.Iamthe(two;second)childofmyparents’.2.JackisinClass(Eight;Eighth).3.Thereare(fourth;four)floorsinthebuilding.34.Usuallyitisverycoldinthe(one;first)monthhere.5.Amanhas(ten;tenth)fingers.6.Weoftenhave(three;third)mealseveryday.Theyarebreakfast,lunchandsupper.7.Thereare(fifty-two;fifty-second)weeksinayear.8.Todayisthe(two;second)dayofthenewterm.三、用适当的数词填空。1.‘T’istheletterintheword‘Christmas’.2.Teachers’DayisontheofSeptember.3.Women’sDayisontheofMarch.4.Therearedaysinaweek.5.Autumnistheseasonofayear.6.Novemberisthemonthofayear.7.Tomisnineyearsold.Todayishisbirthday.8.Thereareseasonsinayear.9.NewYear’sDayisthedayofayear.10.Therearemonthsinayear.11.ThemonthofayearisMay.12.Thereareminutesinanhour.13.Halfofonehundredis.14.TherearelettersinEnglishalphabet(字母表).15.TherearedaysinFebruary.课后练习：单项选择：1.Helivesin.A.theRoom203B.Room203C.203rdRoomD.203Room2.TherewerepeopleintheparklastSunday.A.thousandsB.thousandofC.thousandD.thousandsof3.---Peter,howoldisyourfatherthisyear?---.Andwejusthadapartyforhisbirthdaylastweekend.A.Fortieth;fortyB.Forty;fortyC.Forty;fortiethD.Fortieth;fortieth4.Therearemonthsinayear.Decemberisthemonthoftheyear.A.twelve;twelveB.twelve;twelfthC.twelfth;twelveD.twelve;twelveth5.WehadlearnedaboutEnglishwordsbytheendoflastterm.A.ninehundredsandforty-fiveB.ninehundredsofandforty-fiveC.ninehundredandforty-fiveD.ninehundredandfourty-five6.Thefarmerkeepscowsonhisfarm.A.hundredB.hundredofC.hundredsD.hundredsof7.visitorscometoChinaeveryyear.A.ThousandsofB.TenthousandsC.TenthousandofD.Thousandof48.---HaveyouseentheCCTVnewsonTV?---Yes,childrenhadagoodfestivalontheChildren’sDay.A.millionsof;sixtyB.tenmillion;sixtyC.millionsof;sixtiethD.tenmillions;sixtieth9.Father’sDayisonSundayofJune.A.threeB.thirdC.thethirdD.thethree10.Thenumber999readsnine.A.hundredsandninetyninthB.hundredsandninety-nineC.hundredninetyandnineD.hundredandninety-nine11.Thewordintheword“possible”is“i”.A.fiveB.secondC.twoD.fifth12.---What’sthepopulationofChina?---It’sabout.A.thirteenbillionB.onebillion,threethousandmillionC.twelvebillion,hundredmillionD.onebillion,threehundredmillion13.---Goodnews!Billwonmedalinthelongjumpjustnow.---Really?That’shisoneatoursportsmeeting.A.a;fourB.an;fourthC.a;fourthD.an;four14.Todayismymother’sbirthday.Iwillbuyheragift.A.fourteenB.fourteenthC.fortyD.fortieth15.Morethantwoyearsago,peopleknewlittleabouttheuniverse.A.thousandsB.thousandC.thousandofD.thousandsof数词的用法：1.分数表达法：基数词做分子，序数词作分母;当分子超过1时，分母要加“s”.Eg:1/5:onefifth2/3:twothirds1/2:one/ahalf1/4:aquarter/onefourth3/4:threequarters/threefourths2.年月日表达法：(1)年份用基数词表达，分两位一读。Eg:1999:nineteenninety-nine2000:twothousand2001:twothousandandone2012:twentytwelve/twothousandandtwelve年份前用介词in,如：在1998年：in1998(2)月份名称的第一个字母都要大写，有些月份名称有缩写形式。一月January(Jan)二月February(Feb)三月March(Mar)四月April(Apr)五月May六月June七月July八月August(Aug)九月September(Sep)十月October(Oct)十一月November(Nov)十二月December(Dec)表示在某个月，用介词in5Eg.inOctoberinJuly2003：在2003年7月(3)日期的表达法，日期前要用介词ononJune1st：在六月1号读作：