高考二轮复习语法系统讲解三、数词热身练习1._______treeswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2.______ofthestudentsaregirlsinourclass.A.TwothreeB.TwothreesC.TwothirdsD.Secondthree3.----Whenwasheborn?----hewasbornon________.A.secondofOctoberB.theOctoberthreeC.OctoberthesecondD.threeofOctober【考点直击】1、由数词加名词共同作定语或表语的用法。2、hundred/thousand/million/billion的用法。3、“一年半”的两种表示方式。4、分数的表示方式。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。基数词的构成1)1-12有各自独立的形式。2)13-19都是相对应3-9加上teen构成,特殊拼写的词有thirteen,fifteen,eighteen。3)20-90都以-ty结尾,特殊拼写的有twenty,thirty,forty,fifty,eighty。4)21-99,整数十位数+各位数,中间有“-”。5)百位数,由百位数+and+两位数组成。……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)888,888,888,888eighthundredandeighty-eightbillion,eighthundredandeighty-eightmillion,eighthundredandeighty-eightthousand,eighthundredandeighty-eightbillion2、基数词常与名词构成的合成词在句中作定语,中间要用连字符“_”,这个名词只用单数形式.atwohundred–wordreportaseven-dayholidaya3–year–oldgirl基数词的用法1、表示一个具体数字时,hundred,thousand,million,billion一律不用复数;在表示一个不确定数字时则用复数。例如:1)Ourcountryhasapopulationof1,300millionpeople.2)Therearethreethousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless.4)Maizeisthemostimportantfoodcropformillionsofpeopleintheworld.2、在一些表示“一排”或“一组”的词组里;如:Theyarrivedintwosandthrees.他们三三两两的到达了。3、表示“……十”的数词的复数形式可用来表示“几十岁”或年代,例如:1)Heisinhisearlythirties.2)Hediedstillinhisforties.3)Thistookplacein1930s.4、表示时刻用基数词。例如:Wegetupatsix.Theworkersbeginworkateight.(1)表示“几点过几分”,用介词past,但须在半小时以内。例如:tenpastten,aquarterpastnine,halfpasttwelve(2)表示“几点差几分”用介词to,但分数须在半小时以上。例如:twentytonine,fivetoeight,aquartertoten表示“几点几分”还可直接用基数词。例如:sevenfifteen,eleventhirty,ninetwenty注意下列习惯表达方式:halfanhourhalfakiloonehourandahalf=oneandahalfhourstwoandahalfkilos=twokilosandahalfoneortwodays=onedayortwoeightymeterslongonethousandmilesawayfivemetersdeep(wide/tall/high/long)fivemetersindepth/width/height/length序数词的构成1)1-3分别为first,second,third。2)4-19都是在后面加上th,特殊的有fifth,eighth,ninth,twelfth。3)20-90把y变成ie然后加th,如twentieth。4)21-99的序数词变后面的各位数。序数词可以用缩写,如1st,2nd,3rd,4th…序数词的用法(1)序数词主要用作定语,前面要加定冠词,例如:Thefirsttruckiscarryingafoodbaskets.Johnlivesonthefifteenthfloor.(2)序数词有时前面可加不定冠词来表示“再一”,“又一”这样的意思,例如:We'llhavetodoitasecondtime.ShallIaskhimathirdtime?WhenIsatdown,afourthmanrosetospeak.(3)表示年,月,日时,年用基数词表示,日用序数词表示。例如:1949年十月一日读作:October(the)first,nineteenforty-nine2004年九月十日读作:September(the)tenth,twothousandandfour(4)表示分数时,分子用基数词表示,分母用序数词表示。分子大于1时,分母加-s。例如:1/4one-fourth;2/3two-thirds;1/2a(one)half;1/41(one)quarter;3/4three-quarters;*76/92seventy-sixoverninety-two(5)序数词也可以用作副词,Whendidyoufirstseehim?Whichhorsecameinfirst?(6)基数词也能表示顺序,如书刊的页的数目,住所、房间、教室、电话号码等等。PageEight,Room304,ClassSeven,7)倍数表示法主语+谓语+倍数(或分数)+as+adj.+asIhavethreetimesasmanyasyou.我有你三倍那么多。(8)序数词前面一般要加the,但是也有不加的情况,这个时候表示“又一,再一”的意思。Theyhadasecondchildin1988.上面的asecond可以用another代替。(9)在…世纪:inthetwenty-firstcenturyinthenineteenthcentury1.(2004年上海市徐汇区试题)About________studentsinourclasscandescribethatplaceinEnglish.A.three-fifthsB.three-fifthC.third-fiveD.third-fifths答案:A。该题考查的是分数的表示法。分子用基数词表示,分母用序数词表示。分子大于1时,分母应加-s,因此应选A。2.(2004年河北省试题)Nine_______poundsaweek?That’sverygood.A.hundredofB.hundredsofC.hundredsD.hundred答案:D。该题考查的是数词的用法。Ninehundred是一个具体的数量,这是数词不能用复数形式,后面也不能加of。所以应选D。1.ItissaidthatSARShaskilledmorethan________peopleworldwide.A.threehundredsB.threehundreds’C.threehundred’sD.threehundred2.---Howmanyworkersarethereinyourfactory?---Therearetwo__________.A.hundredsB.hundredC.hundredofD.hundredsof3.---Whichisthesmallestnumberofthefour?---_______________.A.Two-thirdsB.AhalfC.AquarterD.Three-fourths4.---Whatdoyouthinkofawar,LiMing?---I’venoidea.Butit’safactthat_______peoplehadtoleavetheirhometownduringtheWaronIraq.A.threethousandsB.thousandofC.thousandsofD.severalthousands5.Weallthinkthatthe_______centurywillbringusmorehopes.A.twenty-firstB.twentieth-firstC.twenty-oneD.twentieth-one6.---Canyouwritethenumbereighty-fivethousand,sixhundredandtwenty-six?---Yes,itis__________.A.856620B.85626C.58662D.586267.WhenwasthePRCfounded?Itwasfoundedon_________.A.July1,1921B.October1,1949C.August1,1927D.May1,19228.Iwas8yearsoldwhenmyfatherwas31.Thisyearmyfatheristwicemyage.HowoldamI?A.21B.22C.23D.249._______ChinesearelookingforwaystolearnEnglishwellbeforeBeijing2008Olympics.A.ThousandB.ThousandsC.ThousandofD.Thousandsof10.Bothofthetworulersarebroken.Iwanttobuya_______one.A.threeB.thirdC.forthD./