英文基数词序数词的表达和用法课件.ppt

数词,Numerals,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?,2,1基数词（cardinalnumber）,1onetwothree4four5five6six7seven8eight9nine10ten,111213141516171819,eleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteen,2030405060708090100,twentythirtyfortyfiftysixtyseventyeightyninetyonehundred,基数词的构成,1）112,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13-19,由39+teen构成。14fourteen16-sixteen17-seventeen19nineteen特殊拼写:13thirteen15-fifteen18eighteen3）2090,以-ty结尾。20twenty30-thirty40forty50fifty60-sixty70-seventy80-eighty90ninety4）2199，两位数，十位与个位之间有“-”。21twenty-one55fifty-five99ninety-nine5）101999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three,5,29,7,hundred,and,基数词三位数的构成,6,twenty-nine,729,hundred,and,seven,03,5,hundred,and,再来一个,7,three,503,hundred,and,five,基数词三位数的构成,8,hundred,and,百位数,十/个位数,fourhundredandthirty-two,onehundredandseventy,eighthundredandsixty-five,onehundredandnine,109,432,170,865,作业,339,126,203,451,704,178,926,854,703,151,309,326,703,651,307,428,注：1、1000以上几个的词，每三位数加一个逗号，第一个逗号前的数为thousand，第二个逗号前的数为million（百万）,第三个逗号前的数为billion（十亿），第四个逗号前的数为trillion（万亿）888,888，888，888，888eighthundredandeighty-eighttrillion,eighthundredandeighty-eightbillion,eighthundredandeighty-eightmillion,eighthundredandeighty-eightthousand,eighthundredandeighty-eight,trilliontrljn万亿billionbljn十亿millionmljn百万thousandaznd千hundredhndrd百,29,431,500,7,6,thousand,hundred,million,billion,and,6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,million,billion千百万十亿,基数词的构成,12,基数词的构成,6500431729sixbillion,fivehundredmillion,fourhundredandthirty-onethousand,sevenhundredandtwenty-nine,fourthousand,threehundredandtwenty-one,sevenmillion,sixhundredandfiftyfourthousand,threehundredandtwenty-one,7,654,321,1,987,654,321,4321,4,321,onebillion,ninehundredandeighty-sevenmillion,sixhundredandfifty-fourthousand,threehundredandtwenty-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)+,+of,the/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.,作业,7046534210,178346790,1254321307,4283216547,6704653421,817034679,3120432130,9428320654,warmingup1._tresswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2_ofthestudentsaregirlsinourclassATwothreeBTwothreesCTwothirdsDSecondthree3.-Whenwasheborn?-Hewasbornon_.A.secondofOctoberB.theOctoberthreeC.OctoberthesecondD.threeofOctober,18,1.Ifa=3,b=4,whatstheanswertotheproblem,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.Manymillion,A,1基数词（cardinalnumber）,序数词的构成,1)13,first,second,third。2)419,相应基数词+th,fourth,fifth,sixth,seventh,eighth,ninth,tenth,eleventh,twelfth,thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth.3)2090,y变成ie+th,twentieth,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth。4)2199,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,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”要用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),24,一.基数词、序数词,first,second,third,fourth,fifth,sixth,eighth,ninth,twelfth,twentieth,twenty-first,fortieth,onehundredth,onehundredandfifth,onehundredandtwenty-ninth,nineteenth,练习,704653,11712,125,4280,16670465342,8170346791,4453216,94128654,作业,7046534210,178346790,1254321307,4283216547,6704653421,817034679,3120432130,9428320654,2019/12/15,28,可编辑,oneoclock,tenpasttwo,halfpastthree,twentytofive,aquarterpastfive,aquartertoseven,sevenfifty,表示在几点钟用介词at,数词的表示法时间,1.Itsalready7:40now.Whenwillthefilmstart?_.Westillhavefiveminutes.A.AquartertosevenB.AquartertoeightC.Sevenpastforty-five,月日年在1998年10月1日,数词的表示法年月日,onOctorberthefirst,nineteenninety-eight,onAugusttheninth,inMay,twothousandandten,天日用on年月用in,onOct.1st,1998,月日在8月9日月年在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/1990s,在他50多岁时,inhisfifties,数词的表示法1.年代世纪,inthe,inones+整十基数词复数在某人几十岁时,nineteen,nineties,2、“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。a3yearoldgirlaseven-dayholiday,3、表计量-“基数词+度量单位+形容词”Theclassroomis7meterslong,6meterswideand3metershigh.,34,1.Therewillbemorechancesin_centurythanin_century.A.twenty-one,twentyB.twenty-first,twentiethC.thetwenty-first,thetwentieth2.Thecitychangedalot_.A.in1980sB.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-long,be+数词+度量词+形容词,15,分子基数词分母序数词,onefifth,27,分子1分母+s,twosevenths,14,分子a分母quarter,aquarter,34,threequarters,12,ahalf,13,threeandonethird,3,基数词+and+分数,数词的表示法分数百分数,80%,基数词+percent,eightypercent,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,SeventypercentofstudentsinourclassaregirlsOverseventypercentoftheearthssurfaceiscoveredwithwater,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=twohoursandahalf,oneandahalfhours=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.,A+be+倍数+as+adj.原+as+B.A是B的倍A+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!Iveneverseensuchathingbefore.Itisitislong.A.halfnotaswideasB.widenotashalfasC.nothalfaswideasD.aswideasnothalf,sixtimesheavierthan,seventimesasheavyas,C,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;thesecond,A,(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+511Sixplusfiveiseleven或Sixandfiveiseleven.11-65Elevenminussixisfive.或Sixfromelevenisfive.4520Fourmultipliedbyfiveistwenty.或Fourtimesfiveistwenty.2045Twentydividedbyfourisfive.或Fourintotwentygoesfive.3Threesquaredisnine.2Twocubediseight.,加减乘除式的表达方法,2,3,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,(1)序数词作定语，前面要加the；ThefirsttruckiscarryingafoodbasketJohnlivesonthefifteenthfloorSheismyfirstEnglishteacher.(2)有时加a/an，“再一”，“又一”的意思WellhavetodoitasecondtimeShallIaskhimathirdtime？WhenIsatdown，afourthmanrosetospeakTheyhadasecondchildin1988,序数词的用法,49,选择填空。1Marchis_monthofayearAathreeBthethirdCathird2Wewillhaveameetingat8:05_AfivetoeightB.eighttofiveCeightofive3Eightpluseightis_.AsixteenBsixty-fourCone4Heisan_boyAeightyearsBeight-year-oldCeight-years-old5Wewillhavea_walkAtenminutesBtenminutesCten-minutes,Bthethird,Ceightofive,Asixteen,Beight-year-old,Btenminutes,6Thewallis_.AfourmeterslongBfourmeterlongCfour-meterlong7Whatsthedatetoday?Its_AMarchthe