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数词1.基数词的读法和写法.个位和十位之间加连字符“-”,十或个位与前面的数词之间加and;每隔三位加一个单位数词,从后向前数,分别为thousand(千),million(百万),billion(十亿),每个单位数词之间加一个逗号.2.hundred,thousand,million,billion的用法.(1).当hundred,thousand,million,billion前面有基数词表示具体的数量或与several,some,any等连用时,要用单数.Therearetwothousandworkersinthiscompany.(2).当表示笼统.不具体的数量时,用复数,其后加介词of.例如:★Therearehundredsofbirdsonthelake.★Wecanseemillionsofstarsintheskyatnight.1.第一.第二.第三为特殊形式.firstsecondthird2.第四至第十九,由相应的基数词加th构成.例如:fourth;seventeenth,但注意第五.第八.第九.第十二的变化:five---fiftheight---eighthnine---ninthtwelve--twelfth3.20,30,40……90的序数词由相应的基数词变y为i再加eth构成.例如:twenty---twentiethninety---ninetieth4.21---99等数,十位数用基数词,个位数用序数词,而且十位与个位之间加连字符“-”.例如:twenty-one----twenty-firsttwenty-five---twenty-fifth5.序数词前一般加the,如果跟形容词要用最高级．但表示“再一,又一”时要加a.例如:★BeijingisthesecondlargestcityinChina.★Theninthlessonishardtolearn.★Wouldyoulikeasecondtry?1.分数表示法先分子，后分母。分子用基数词，分母用序数词。分子大于1时，分母序数词用复数.注意：中间不用连字符不可不记1/2onesecond1/3onethird2/3twothirds1/4onequarter3/4threequarters3/5threefifths2.分数的用法当分数+of+名词/代词时,谓语动词要根据名词/代词的单复数,或可.不可数名词来决定.例如:★Onethirdofthestudentsinourclassareboystudents.★Twofifthsofthelandiscoveredbywater.倍数表示法a.主语+谓语+倍数(或分数)+as+adj.+asIhavethreetimesasmanyasyou.我有你三倍那么多b.主语+谓语+倍数(分数)+形容词(副词)比较级+than…Thisfishis3timesheavierthanthatofthatone.小数：小数点读point,0读o或zero,小数点后的数字按个位基数词依读出即可。0.5zeropointfive,3.145threepointonefourfive百分数：百分数由基数词+percent来表示.3%threepercent56%fifty-sixpercent1.数字表示的年份通常分成两半来说.例如:1985nineteeneighty-five1900nineteenhundred2007twohundredandseven2.月.日的表示.月在前,日在后,日要用序数词或读序数词.例如:May23读作May(the)twenty-third或thetwenty-thirdofMay.1.用基数词,按顺序读.例如:6:00sixo’clock3:45threeforty-five2.在半小时内,包括半小时(半小时用half表示;一刻钟用aquarter表示),可以用介词past.分钟数+past+钟点数6:15aquarterpastsix12:30halfpasttwelve2.在半小时以上,不包括半小时,可以用介词to表示,to之前为分钟数,之后为下一个钟点数,表示“差几分到几点”.例如:7:45aquartertoeight10:50tentoeleven1.用序数词表示:the+序数词+名词.例如:thefifthpagethetwelfthlessontheSecondWorldWar2.用基数词表示:名词+基数词(首字母大写).Room202Lesson5theNo.2Middleschool1.数词前加every,表示“每一段时间或每隔一段……”.例如:Igohometoseemyparentseverytwomonths.2.表示年代或岁数时,用逢十的基数词的复数形式.inone’s+数词复数在某人几十多岁inthe1960s.二十世纪六十年代Inherfifty在她五十多岁3.用序数词表示世纪。Inthetwentiethcentury在20世纪Inthetwenty-firstcentury在21世纪3.复合数词短语作定语时,书写时要用连字符,单位用单数.★Shelikestowatchhereleven-year-oldsonplayingsoccer.★Weusuallyhaveseven-dayholidayonNationalDay.4.半数词的表示:halfanhour半小时twoandahalfhours两个半小时twohoursandahalf两个半小时1.Look！Thereare_________(million)ofstarsinthesky.2.＿＿＿＿＿（2／3）ofthestudentsaregirlsinourclass．3.Septemberisthe__________(nine)monthoftheyear4.Marchthe______(eight)isWomen’sDay．millionsTwothirdsnintheighth5.Annreceivedalotofpresentsonher________(twelve)birthday.Thetwelve-year-oldgirlfeltveryhappy．6.Thereare_______(四十)studentsinourclass,twentyboysandtwentygirls．7.MyfatherhasbeentoBeijing_____(two),whataboutyourfather?8.Atthebeginningofthe_____________(twenty)century,theworld'spopulationwasabout1,700million．twelfthfortytwicetwentieth1.Whichisthesmallestnumberofthefour?A.AhalfB.AquarterC.Two-thirdsD.Three-fourths♣2.Thequestionistooeasy,evena____boycananswerit.A.12-year-oldB.12-years-oldC.12yearoldD.12yearsold3.ItissaidthatSARShaskilledmorethan______peopleintheworld.A.threehundredsB.threehundreds’C.threehundred'sD.threehundredAD4.Wecansee______starsatnightifitdoesn'train.A.thousandB.thousandsC.thousandsofD.thousandof5.Wearethirsty.Pleasegiveme_________.A.twocupsofteaB.twocupsteaC.twocupofteasD.twocupsofteasCA6.I'mafraidwehavetoget_______forthemeeting.A.twentymorechairsB.moretwentychairsC.twohundredschairsD.twentyonechairs7.WhenisChristmasDay,doyouknow?___________.A.October1stB.June1stC.November25thD.December25th(A)(D)8.Whatwasthedateyesterday?Itwas_________.A.FridayB.afinedayC.July1stD.20039.Therearetallbuildingson______sideofthestreet.A.everyB.eitherC.bothD.all10.Ifyoulikethechicken,youcanhaveas_________asyoucan.A.muchB.manyC.moreD.littleCBA11.Thenumber2,146isreadas_____.A.twothousandsandahundredandfortyandsix.B.twothousandandahundredandforty-six.C.twothousand,onehundredandforty-six.D.twothousands,onehundred,forty-six.C12.Excuseme,howdoesthisnumber20,135read?Itreads___________.A.twentythousandsonehundredandthirtyfiveB.twentythousandonehundredthirtyfiveC.twentythousand,onehundredandthirty-fiveD.twentythousands,onehundredandthirty-five13.Inourclass______ofthestudentsaregirls.A.threefifthsB.threefifthC.thirdfiveD.thirdfifthsCA14.Nine___poundsaweek?That’sverygood.A.hundredofB.hundredsofC.hundredsD.hundred.15.______peoplecometoJilintovisitMountChangbaieveryyear.A.ThousandsofB.ThousandofC.ThousandsD.Thousand16.Thecomputerwascheap.Ispentonlytwo_____Yuanonit.A.thousandsB.thousandC.thousandsofD.thousandofDAB17.About_____oftheworkersintheclothesfactoryarewomen.A.thirdfifthsB.thirdfifthC.threefifthsD.threefifth18.It’sabout______kilometresfromNanningtoBeijing.A.twothousand,fivehundredandsixtyB.twothousand,fivehundredsandsixtyC.twothousands,fivehundredandsixtyD.twothousands.fivehundredsandsixtyCA19.Everyyear,______fishesarekilledbythepollutedwater.A.millionofB.millionsofC.twomillionsofD.twomillions20.Theboytoldtheoldwoman,“Thetrainwillarriveattwotot