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语法专项训练(五)数词,英语数词即表示数目多少或顺序先后的词.数词有两种:基数词和序数词.表示数量多少的叫基数词,表示次序的叫序数词.注意以下数词的拼写:,one,thefirst；two,thesecond；three,thethird；four,thefourth；five,thefifth；nine,theninth；twelve,thetwelfth；fifteen,thefifteenth；nineteen,thenineteenth；twenty,thetwentieth；twentyone,thetwentyfirst；thirty,thethirtieth；forty,thefortieth；eighty,theeightieth；ninetynine,theninetyninth；etc.,考点一基数词1基数词的形式基数词中112是独立单词,1319的基数词以后缀-teen结尾,2090八个整十位数数词以后缀-ty结尾.表示其他两位数词,十位与个位之间用连字符“-”:,twenty-three,seventy-five,etc.百位数与十位数之间,英式英语用and连接,美式英语一般不用:threehundredandsixty-fivedays；eighthundredandtwenty-twostudents,etc.2基数词的用法,3.基数词的复数形式(1)表示确切数字时,ten,hundred,thousand,million只用单数形式,不能加-s.(2)dozen(十二),score(二十),head(一头)等表示确切数字时不用复数形式,但在表示不确切数字时要用复数:,twodozenbottlesofbeer；dozensoftimes；fourscoreandsixyears；scoresofstudents(3)表示“几十”的数词的复数形式可用来表示人的岁数或年代.Shediedinherforties.Thisstorytookplaceinthe1950s.,考点二序数词1序数词的形式,2.序数词的基本用法,考点三倍数1倍数既可以表示增加,也可以表示减少,分数也在此列；表示增加、减少时包括基数,相当于“乘、除”.(1)通常说“增加了X倍”,不包括基数,纯增加；若是“增加到X倍”或“是原来的X倍”,则包括基数.,Themachineimprovestheworkingconditionsandraisesefficiencyfourtimes.这种机器改善了工作条件,提高了4倍的工作效率.,(2)分数的构成:基数词序数词；基数词(分子)大于1时,序数词(分母)用复数.onethird1/3,onefifth1/5,onetwentieth1/20,twofifths2/5,threesevenths3/7,fiveninths5/92倍数比较的表示法,.单句填空用括号里适当的单词或短语完成下面的句子1Ittookusquitealongtimetogettotheamusementpark.Itwas_(athree-hours,athree-hour)journey.,athree-hour,解析:考查“不定冠词基数词连字符单数名词”的用法.连字符连接的词作定语且其中的名词用单数.,2Itisreportedthatthefloodshaveleftabout_(twothousand,twothousands)peoplehomeless.解析:hundred,thousand,million等前面有具体的数字表达具体的数量时,这些词不用复数,后面不加of；运用复数时,后面加of则表达“概数”.,twothousand,3Several_(million,millions)peopleintheworldaresendinginformationbye-maileveryday.,million,4Hehasread_(hundred,hundreds)ofbooksinhislife.解析:hundred前面没有具体数字,后of应用复数,表示“概数”.,hundreds,5_(Twofifth,Twofifths)ofthelandinthatdistrict_(is,are)coveredwithtreesandgrass.解析:考查分数表达.分子大于1时,分母要加s.分数表示整体的一部分,谓语用单数.,Twofifths,is,6Hedidit_(one-thirdtime,one-thirdthetime)ittookme.解析:考查倍数the名词.,one-thirdthetime,7LouiseBrown,the_(worldstest-tubefirstbaby,worldsfirsttest-tubebaby)is70yearsoldnow.,worldsfirsttest-tubebaby,8Ihear_(quiteafew,quitealittle)boysinyourschoollikeplayingfootballintheirsparetime,thoughotherspreferbasketball.解析:根据后面的“boys”是可数名词,few修饰可数名词,故填quiteafew.,quiteafew,9Itisnotrareinthe_(90,90s)thatpeopleintheir_(fifty,fifties)aregoingtouniversityforfurthereducation.解析:前者指年代,用“the基数词的复数”；后者指年龄,用“ones基数词的复数”.,90s,fifties,10Shewenttothebookstoreandbought_(dozensofbooks,dozenbooks)解析:dozen意为“一打,十二个”,与数词连用时要用单数,与of连用时要用复数形式.dozensof意为“若干,许许多多”.,dozensofbooks,.语篇填空根据括号内的汉语提示用适当的数词完成下面的短文.Haveyoueverseen1._(一个)chimpanzee(黑猩猩)inazoo？Ifnot,betterrunandseeone.Why？Becausetheyreindangerandtheremaysoonbenoneleft.,a/one,Chimpanzeeswereoncefoundin2._(许多)Africancountries.But,lastweekaUnitedNationsreportsaidthattheyaredisappearingfromsomecountriesfast.InSenegal,forexample,many/agreatnumberof,thereareonly3._(二百)left.Thereusedtobe4._(几千)Chimpanzeesarealsoindangerinotherpartsoftheworld.Chimpanzeesareakindofgreatape.Therearethreeotherkindsofgreatape:gorillas,twohundred,severalthousand,gibbonsandorangutans,whichareallindanger.Thereareabout5._(四十万)greatapesintheworld.“Theyallfaceextinction,somesoon,otherswithin6._(五十五年),”,fourhundredthousand,fifty-fiveyears,saysKlausTopers,headoftheUNEnvironmentprogramme.“Over7._(百分之九十六)ofgreatapesDNAislikeours.Ifwelosethem,wewilldestroyapartofourselves,”saysKlaus.,ninety-sixpercent,Whyarechimpanzeesindangerandhowcanwesavethem？Thatsbecauseofhumans.Wearekillingthemanddestroyingtheforestswheretheylive.AccordingtotheUNreport8._(数千计的)chimpanzeesdieeachyearbecauseofhumans.,thousandsof,Somepeoplekillthemformoney.But9._(三分之二)ofthemdieafterhumanscutdowntheforestswheretheylive,whichmeansgreatapeshavenoplacetoliveandnofoodtoeat.,two-thirds,Lastweek,scientistsfrom10._(四分之三的)thecountriesoftheworldmetinParis,France,andmadeareporttellingcountrieshowtoprotectapes.,threefourths/quartersof,本部分内容讲解结束,按ESC键退出全屏播放,
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