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中考英语专题复习之数词1.基数词和序数词的变化基数词:表示事物的多少序数词：表示事物的顺序①基数词变序数词遵循下列原则:a.序数词在相应的基数词词尾加th;b.整十数的序数词是先将y变为i,再加eth;c.两位或两位以上的基数词变为序数词时，仅将个位变为序数词即可。②基数词变序数词口诀:基变序,有规律,末尾加上th;一二三，特殊记，八加h,九去e,ve要用f替；以y结尾变ie,后跟th莫忘记；若想表示几十几，只变个位就可以。one-firstfive-fifthnine-ninththirteen-thirteenthseventeen-seventeenththirty-thirtiethtwo-secondsix-sixthten-tenthfourteen-fourteentheighteen-eighteenthforty-fortieththree-thirdseven-seventheleven-eleventhfifteen-fifteenthnineteen-nineteenthfifty-fiftiethfour-fourtheight-eighthtwelve-twelfthsixteen-sixteenthtwenty-twentiethsixty-sixtiethseventy-seventieth,eighty-eightieth,ninety-ninetieth,ninety-three---ninety-third,hundred-hundredth③基数词20~90是在十位数词后面加-ty构成.基数词21~99是在十位数词后面加上个位数词构成,中间加上连字符“-”.④三位数：基数词+hundredand＋末尾两位数⑤多位数从右向左每隔三位数加一个逗号，依次是thousand,million,billion。10，000可写成tenthousand，100,000,000可写成ahundredmillion，35,845可写成thirty-fivethousandeighthundredandforty-five2.基数词和序数词的用法a.序数词前通常用定冠词the;b.序数词前若有限定词，则不在加the;c.序数词若出现不定冠词a/an,则表示又一，再一，内含顺序性。We’llgooveritasecondtime.We’vetireditthreetimes.Mustwetryitafourthtime?d.ofthe+基数词，表示范围。Sheisthemostbeautifulgirlofthethree.Jimisthetallerofthetwo.3.年龄、长、宽、高等的表示方法:基数词+量词（meter/kilometer/kilo/year）+形容词（long/wide/deep/old）4.分数的表达:分子用基数词,分母用序数词；若分子大于1,分母要加s。a.三又四分之二threeandtwofourthsb.quarter,half(onefourth=aquarter,threefourths=threequarters,ahalf=onesecond)c.当分数/百分数+of+名词作主语时，谓语的数由分数后面的名词决定。d.当halfof+名词作主语时，谓语的数由分数后面的名词决定。5.年份、日期、编号的表达a.年份表达为“月日，年”，月要大写，日要用序数词，年要用基数词。June1st,2016b.编号表示法（名词+基数词=the+序数词+名词）第一课LessonOne=thefirstlesson,第二页PageTwo=thesecondpage,八年级二班ClassTwo,GradeEight6.概数与具体的数字a.具体的数字:基数词+hundred/thousand/million/billion(无论基数词是多少，hundred/thousand/million/billion一律用原形)；b.概数：表示成百上千的，数以百计的，用hundred/thousand/million/billion先加s,再加of.c.基数词+hundred(s)of是错误的7.时间表达法(past过，to差)：a.整点(基数词+o’clock)b.顺读法，先点后分：几点过几分（前半小时用“分钟数+past+已过钟点数”）c.倒读法，先分后点：几点差几分后半小时用(60-分钟数)+to+下一个钟点数d.正好半点用“halfpast+已过钟点数”；一刻钟用“quarter”8:30halfpasteight;9:15aquarterpastnine;9:45aquartertoten.8.百分数的表示(基数词+percent)分数/百分数+of+名词作主语时，谓语的数由分数后面的名词决定。9.小数的表示:小数点前的整数按基数词的规则表示,小数点写作point,小数点后的数字应按数字顺序直接表示出来。18.38可写成eighteenpointthreeeight.10.复合形容词(基数词-量词-形容词)作定语，一旦用了连字符，量词必须用单数形式。基数词-量词-形容词=可简写成“基数词-量词”=基数词+量词复数的所有格形式Ihaveaneight-year-olddaughter.=Ihaveaneight-yeardaughter.=Ihaveaneightyears’daughter.11.(1)in+the+数词的复数形式，表示年代。inthe1970s/1970’s(2)in+物主代词+数词的复数形式，表示某人的年龄。inone’sthirties在某人三十多岁的时候有时在物主代词后面可加上形容词early或late使其含义更确切一些。Theyoungmanisinhisearlythirties.12.表示每隔…（every+基数词+量词）everyfouryears每四年（每隔三年）13.另几…,再几…:基数词+more+名词=another+基数词+名词,表示再原来的基础上再增加几个(twomorehours=anothertwohours)1.Boysandgirls,pleaseturntoPageandlookatthepicture.（2015呼和浩特）A.Fifth;fiveB.Five;fiveC.Fifth;fifthD.Five;fifth2.Ittookpeoplethreemonthstobuildthisgreatbuilding.（2015安顺）A.twohundredsB.hundredofC.hundredsofD.twohundredof3.Tony’smumlooksyoungandbeautiful.It’shardtoimaginesheisalreadyinher.（2015苏州）A.fiftiesB.fiftyC.fiftiethsD.fiftieth4.---Whichclasswonthematchintheend?---I’mnotquitesure.Perhapsdid.A.ClassThirdB.ThirdClassC.ClassThreeD.ThreeClass5.---Watercoversmostpartsoftheearth.---Yes,aboutoftheearthiscoveredwithwater.A.onefourthB.halfC.threefouthsD.twothirds6.“Iwantmyleg!Iwanttojump,”agirlcriedinthehospital.A.5-year-oldB.5-years-oldsC.5yearoldD.5-year-old7.---HasMarybeenback?---Notyet.ShewillcomebacktheeveningofJune.A.at,firstB.to,thietiethC.on,thetwelfthD.on,thenineteen8.Aboutofthestudentsinourclasswereborninthe.A.two-thirds,1990sB.two-thirds,1990C.two-third,1990sD.secondthirds,1990s9.Tomorrowistheboy’sbirthday.A.seventhB.sevenC.seventeenD.seven’s10.TheworkistoodifficultforMrZhutofinishinaweek.Heneedsdays.A.moretwoB.twomoreC.twoanotherD.anothermore11.Theoldmanbegantolearntodriveacarattheageof.A.sixtyB.thesixtiethC.sixyearsoldD.sixties12.MyuncleboughtmeaniPhoneformybirthday.A.twelveB.twelfthC.thetwelveD.thetwelfth13.“Whattimedoyouusuallygetup,John?”“Iusuallygetupat.”A.halfpastsixB.halftosixC.halfaftersixD.sixhalf14.Pleaseturnto.Let’sreadthetextaloud.A.PageTwoB.thepagetwoC.secondpageD.pagesecond15.Weallthinkthatthecenturywillbringusmorehope.A.twenty-firstB.twentieth-firstC.twenty-oneD.twentieth-one16.Myfatherwillhaveaholidaynextmonth.He’lltakemetoclimbthemountain.A.tendaysB.tenday’sC.ten-daysD.tendays’17.Bothofthetworulesarebroken.Iwanttobuyone.A.athreeB.athirdC.aforthD.theforth18.Aboutofthesurfaceoftheearthcoveredwithwater.A.threequarter,isB.threequarters,hasC.threequarters,isD.threequarter,are