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数词Numerals 2warmingup1._______tresswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2．______ofthestudentsaregirlsinourclass．A．Twothree B．TwothreesC．Twothirds D．Secondthree3.----Whenwasheborn?----Hewasbornon________.A.secondofOctoberB.theOctoberthreeC.OctoberthesecondD.threeofOctober 3表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。什么叫数词? 4基数词的构成1）1－12,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13--19,由3－9+teen构成。14–fourteen16--sixteen17--seventeen19—nineteen特殊拼写:13–thirteen15--fifteen18—eighteen3）20－90,以-ty结尾。20—twenty30---thirty40—forty50—fifty60---sixty70---seventy80---eighty90—ninety4）21－99，两位数，十位与个位之间有“－”。21twenty—one55fifty—five99ninety—nine5）101—999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three 529,43150076,,thousandhundredmillionbillionand6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,million,billion基数词的构成 基数词的构成6500431729sixbillion,fivehundredmillion,fourhundredandthirty-onethousandsevenhundredandtwenty-nine fourthousandthreehundredandtwenty-onesevenmillion,sixhundredandfiftyfourthousandthreehundredandtwenty-one7,654,3211,987,654,32143214,321onebillion,ninehundredandeighty-sevenmillion,sixhundredandfifty-fourthousandthreehundredandtwenty-one 1.hundredthousand(表示具体数字)millionbillion2.hundredsthousands(表示概数)millionsbillions三.基数词的用法数词(several)++ofthe/some/many/these/thosehundredsof 基数词的用法1、表示具体数目,hundred,thousand,million不用复数表示不确定数目,用复数。即hundredsof(数百),thousandsof(数千),millionsof(数百万)+名词复数。1)Ourcountryhasapopulationof1,300millionpeople.2)Thereareseveralthousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless. 1.—Ifa=3,b=4,what’stheanswertotheproblem,a+2ab+1=?—theansweris___.A.twentyeightB.twenty-eighthC.twenty-eight2.Inourschoolaboutfive__studentsareabletosurftheInternet.A.hunderdofB.hunderdsofC.hundred 3.__sheepwerekilledintheaccident.A.ThousandofB.ThousandC.Thousandsof4.Thereareovernine__workersinthefactory,but__ofyoungpeoplehopetoworkinit.A.hundred0f;hundredsB.hundred;hundredsC.hundreds;hundred 5.peopleintheworldaresendinginformationbye-maileveryday.A.SeveralmillionB.ManymillionsC.SeveralmillionsD.ManymillionA 序数词的构成1)1－3,first,second,third。2)4－19,相应基数词+th,fourth,fifth,sixth,seventh,eighth,ninth,tenth,eleventh,twelfth,thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth.3)20－90,y变成ie+th,twentieth,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth。4)21－99,只把个位的基数词变成序数词如twenty-first,ninety-ninth5)序数词缩写----数字＋最后两字母如1st,2nd,3rd,4th… 14基变序,有规律,词尾加上“th”，一、二、三，特殊记，结尾字母t,d,d八去“t”，九去“e”，“f”要把ve替见“y”变成“i”和“e”，词尾加上“th”，若是遇到几十几，只变个位就可以。序数词缩写记清楚,数字后跟两字母。(序数词构成规律) 基数词序数词基数词序数词onetwelvetwotwentythreetwenty-onefourfortyfiveonehundredsixonehundredandfiveeightonehundredandtwenty-nineninenineteen一.基数词、序数词firstsecondthirdfourthfifthsixtheighthninthtwelfthtwentiethtwenty-firstfortiethonehundredthonehundredandfifthonehundredandtwenty-ninthnineteenth 时间类型表示法例读法整点基数词（+o’clock)1:00﹤30分钟分钟+past+小时2:10=30分钟half+past+小时3:30﹥30分钟（60-分钟）+to+（小时+1）4:40分钟逢15即一刻钟aquarter5:156:45简化法按顺序读基数词7:50oneo’clocktenpasttwohalfpastthreetwentytofiveaquarterpastfiveaquartertosevensevenfifty表示在几点钟用介词at数词的表示法—时间 1.—It’salready7:40now.Whenwillthefilmstart?—___.Westillhavefiveminutes.A.AquartertosevenB.AquartertoeightC.Sevenpastforty-five ①月日年在1998年10月1日数词的表示法—年月日onOctorberthefirst,nineteenninety-eight日the+序数词月（首字母大写）月日与年之间用，分开年（两位两位读）onAugusttheninthinMay,twothousandandten天日用on年月用inonOct.1st,1998②月日在8月9日③月年在2010年5月 1.Theaccidenthappenedon___.A.April5,2001B.2001,April5C.April2001,52.Iwasborn___.A.inMarch8,1993B.onJuly9,1994C.onMay,1995 20世纪90年代inthe1990s/1990’s在他50多岁时inhisfifties数词的表示法—1.年代世纪intheinone’s+整十基数词复数在某人几十岁时nineteennineties 212、“基数词+名词”的合成形容词作定语，中间有连字符“－”,当中的名词用单数。a3–year–oldgirlaseven-dayholiday3、表计量--“基数词+度量单位+形容词”Theclassroomis7meterslong,6meterswideand3metershigh. 1.Therewillbemorechancesin__centurythanin__century.A.twenty-one,twentyB.twenty-first,twentiethC.thetwenty-first,thetwentieth2.Thecitychangedalot___.A.in1980'sB.inthe1980sC.inthe1980 3.Hegraduatedin__of__century.A.thesixtieth;twentyB.sixty;thetwentiethC.hissixties;thetwentieth4.Shegottheprize__.A.inherfiftiesB.infiftiesC.inherfifty 5.Thewinneris___.Heisan___boy.A.eight-year-old;eightyearsoldB.eightyearsold;eight-year-oldC.eight-yearsold;eight-year-old6.HecametoChina____.A.attheageof20B.whenheis20C.atageof20 7.Theriverisabout____.A.6,000meterslongB.6,000-meters-longC.6,000-meter-longbe+数词+度量词+形容词 15分子基数词分母序数词onefifth27分子﹥1分母+stwosevenths14分子a分母quarteraquarter34threequarters12ahalf13threeandonethird3基数词+and+分数数词的表示法—分数百分数 80%基数词+percenteightypercent百分数+of+可数名词复数谓语动词用复数百分数+of+不可数名词谓语动词用单数SeventypercentofstudentsinourclassaregirlsOverseventypercentoftheearth'ssurfaceiscoveredwithwater 1.__ofthestudents__boysinClassA.Twothree;areB.Twothirds;areC.Twothirds;is2.__ofhermoney__spentonclothes.A.Twothree;areB.Twothirds;isC.Twothird;is3.__theteachersinourschoolisaboutonehundred,and__ofthemarewomenteachers.A.Thenumberof;twothirdsB.Thenumberof;twothirdC.Anumberof;twothirds 一个半小时两个半小时twoandahalfhours=twohoursandahalfoneandahalfhours=onehourandahalf数词的表示法—半的表示法1.Theboyalwaysstaystherefor__.A.threeandhalfhourB.threehourandahalfC.threeandahalfhours2.Theoldmandrank__beer.A.twobottlesandahalfB.twoandahalfbottleC.twobottleandahalf 一倍once，两倍twice，三倍threetimes(三倍或以上基数词＋times)数词的表示法—倍数Thisboxisfivetimesasbigasthatone.=Thisboxisfourtimesbiggerthanthatone.①A+be+倍数+as+adj.原+as+B.A是B的…倍…②A+be+倍数+adj.比+than+B.A比B……倍 1.Thisbuildingis__thatbuilding.A.threetimeastallasB.twicetallerthanC.threetimesastalleras2.我的箱子比你的重六倍!Myboxis____________________yours.2.Whatatable!I'veneverseensuchathingbefore.Itisitislong.A.halfnotaswideasB.widenotashalfasC.nothalfaswideasD.aswideasnothalfsixtimesheavierthanseventimesasheavyasC 一般编码用名词+基数词207房三年级一班第五部分第一课3号汽车第一中学Room207ClassOneGradeThreePartfive=thefifthpartLessonone=thefirstlessonBusNo.3=theNo.3busNo.1MiddleSchool数词的表示法—编号1.Mymotherlivesatonfloor.A.RoomSix;thesecondB.SixRoom;secondC.Roomsix;twoD.theroomsix;thesecondA (1)小数的读法小数点左边的数通常按基数词读，若为三位以上的数，也可按编码式读法读出，即将数字单个读出；小数点右边的数通常按编码式读法单个读出。如：6.86sixpointeightsix14.15fourteenpointonefive(2)小数中“0”的读法“0”在小数中通常读作nought（英）或zero（美），也可读作字母o。如：0.08（nought）pointnoughteight或（zero）pointzeroeight小数表示法 6+5＝11Sixplusfiveiseleven或Sixandfiveiseleven.11-6＝5Elevenminussixisfive.或Sixfromelevenisfive.4×5＝20Fourmultipliedbyfiveistwenty.或Fourtimesfiveistwenty.20÷4＝5Twentydividedbyfourisfive.或Fourintotwentygoesfive.3Threesquaredisnine.2Twocubediseight.加减乘除式的表达方法23 表示“大约、接近”，常用nearly,about,some,almost,around等。about700peoplesomefiftyyearsago表示“左右”用orsoInthepastfiveyearsorso“少于”用lessthanLessthan30yearsold不到30岁“多于”用morethan,overMorethanayearagoover70yearsago约数表示法 36(1)序数词作定语，前面要加the；Thefirsttruckiscarryingafoodbasket．Johnlivesonthefifteenthfloor．SheismyfirstEnglishteacher.(2)有时加a/an，“再一”，“又一”的意思We‘llhavetodoitasecondtime．ShallIaskhimathirdtime？WhenIsatdown，afourthmanrosetospeak．Theyhadasecondchildin1988序数词的用法 选择填空。 1．Marchis____monthofayear． A．athreeB．thethirdC．athird 2．Wewillhaveameetingat8:05____． A．fivetoeightB.eighttofiveC．eightofive 3．Eightpluseightis____. A．sixteenB．sixty-fourC．one 4．Heisan____boy． A．eightyearsB．eight-year-old C．eight-years-old 5．Wewillhavea___walk． A．tenminutesB．tenminutes' C．ten-minutesB．thethirdC．eightofiveA．sixteenB．eight-year-oldB．tenminutes' 6．Thewallis____. A．fourmeterslongB．fourmeterlongC．four-meterlong7．What'sthedatetoday?It's___． A．MarchtheeightB．Marchtheeighth C．eight，March 8．Ithappenedinthe1040's． A．inthefortiesoftheeleventhcentury． B．inthefortiesofthetenthcentury． C．intheforty9．About_____________oftheearth'ssurfaceiscoveredwithwater. A.three-foursB.three-fourthC.three-fourthsA．fourmeterslongB．MarchtheeighthA．inthefortiesoftheeleventhcentury．C.three-fourths 10.Hewentdowntothevillagewhichwas___milesawayfromthecity. A.threehundredsB.threehundred C.threehundredsofB.threehundred 40Homework1.Grammarfocustextbook(p30)exercise1-22、Workbook(p19)exercise4 THEEND
