数词课件.ppt

数词复习2热身练习1._______tresswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2．______ofthestudentsaregirlsinourclass．A．TwothreeB．TwothreesC．TwothirdsD．Secondthree3.----Whenwasheborn?----hewasbornon________.A.secondofOctoberB.theOctoberthreeC.OctoberthesecondD.threeofOctober3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。4数词的构成5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—fifty80---eighty60---sixty70---seventy90—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-three629,43150076,,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71.—Ifa=3,b=4,what’stheanswertotheproblem,a+2ab+1=?—theansweris___.A.twentyeightB.twenty-eighthC.twenty-eight2.Inourschoolseveral__studentsareabletosearchtheInternet.A.hunderdofB.hunderdsofC.hundred3.Many__sheepwerekilledintheaccident.A.thousandsofB.thousandC.thousands4.Thereareovernine__workersinthefactory,but__ofyoungpeoplehopetoworkinit.A.hundred;hundredsB.hundreds;hundredsC.hundreds;hundred序数词的构成1)1－3,first,second,third。2)4－19,相应基数词+th,特殊拼写:fifth,eighth,ninth,twelfth。3)20－90,y变成ie+th,如twentieth。4)21－99,只把个位的基数词变成序数词如twenty-first。5)序数词缩写----数字＋最后两字母如1st,2nd,3rd,4th…10基变序,有规律,一、二、三，特殊记，面目全非要注意，加th从4起，八少“t”，九去“e”，“ve”要用“f”替，(five,twelve)见“y”变成“i”和“e”，词尾加上“th”，(twenty,thirty,……ninety)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,可以用many/several修饰，但不能与具体数目连用。1)Ourcountryhasapopulationof1,300millionpeople.2)Therearethreethousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless.4)Several/Manythousandsoftreesmustbeplantedeveryyear.122、“几十”的复数形式可以表示：在某人几十岁时----in+one’s+整十基数词复数年代----in+the+数词复数1)Hediedinhisforties．四十多岁2)Inthenineties,mostpeoplegotoworkbybike.90年代3、“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-dayholiday4、表计量--“基数词+度量单位+形容词”Theclassroomis7meterslong,6meterswideand3metershigh.131.Thewinneris___.Heisan___boy.A.eight-year-old;eightyearsoldB.eightyearsold;eight-year-oldC.eight-yearsold;eight-year-old2.HecametoChina____.A.attheageof20B.whenheis20C.atageof203.Hegraduatedin__of__century.A.thesixtieth;twentyB.sixty;thetwentiethC.thesixties;thetwentieth4.Hegottheprize__.A.inhisfiftiesB.infiftiesC.inhisfifty5、表示时刻(介词用at)1)顺读法----先时后分,“几点几分”9:30ninethirty6:21sixtwenty-one3)15分钟：aquarter30分钟：ahalf9:15aquarterpastnine12:30halfpasttwelve表示“整点”时，在基数词后加o’clock;9:00o’clock2)逆读法----先分后时表示“几点过几分”，半小时以内，介词用past分钟数+past+钟点数10:10tenpastten8:20twentypasteight表示“几点差几分”，半小时以上，介词用to60减原分钟+to+(下一个)钟点数9:50tentoten7:40twentytoeight16(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17编号表示法编号在前，名词在后，用序数词，前面有the编号在后，名词在前，用基数词，注意首字母大写房间号码和电话号码要一个一个分别读TheFirstLesson（在句子中不大写）LessonOnethethirty-secondpagePage32/PageThirty-twoRoom305BusNo.12=theNo.12bus第一课第32页第305房间第12路公共汽车1815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+分数分数百分数80%基数词+percenteightypercenthalf/(百)分数+of+可数名词复数谓语动词用复数half/(百)分数+of+不可数名词谓语动词用单数3.78threepointseveneightdiscount用于表示“打折”。如：打六折fourdiscount1.__ofthestudents__boysinClassA.Twothree;areB.Twothirds;areC.Twothirds;is2.__ofhermoney__spentonclothes.A.Twothree;areB.Twothirds;isC.Twothird;is3.__theteachersinourschoolisaboutonehundred,and__ofthemarewomenteachers.A.Thenumberof;twothirdB.Thenumberof;twothirdsC.Anumberof;twothirds一个半小时两个半小时twoandahalfhours=twohoursandahalfoneandahalfhours=onehourandahalf半的表示法1.Theboyalwaysstaystherefor__.A.oneandhalfhourB.oneandahalfhourC.oneandahalfhours2.Theoldmandrank__beer.A.twobottlesandahalfB.twoandahalfbottleC.twobottleandahalf1999nineteenninety-nine2008twothousandandeight1949年10月1日读作:October(the)first,nineteenforty-nine(月-日，年)thefirstofOctober,nineteenforty-nine（日-月，年）写作:October1st,1999(日用缩写，月-日-年)October1,1999(日用数字)1stOctober,1999日-月，年年份、日期表达法年用基数词表示,两位一读,介词用in日用序数词表示,介词用on231.Theaccidenthappenedon___.A.April5,2001B.2001,April5C.April2001,52.Iwasborn___.A.inMarch8,1993B.onJuly9,1994C.onMay,199520世纪90年代inthe1990s数词的表示法—年代世纪inthenineteennineties表示“在…世纪”,用序数词。在20世纪写作：in20thcentury读作：inthetwentiethcentury1.Therewillbemorechancesin__centurythanin__century.A.twenty-one,twentyB.twenty-first,twentiethC.thetwenty-first,thetwentieth2.Thecitychangedalot___.A.in1980sB.inthe1980sC.inthe19803.Hegraduatedin__of__century.A.thesixtieth;twentyB.sixty;thetwentiethC.thesixties;thetwentieth4.Hegottheprize__.A.inhisfiftiesB.infiftiesC.inhisfifty表示“大约、接近”，常用nearly,about,some,almost,around等。about700peoplesomefiftyyearsago表示“