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数词用法知多少近几年的中考中,经常有涉及数词方面的知识,也是学生经常出错的地方。本文就数词的用法作一归纳,供大家在复习中参考。一、除了从1-12个基本数词(基数词)用不同的词表达外,从13-19后都有-teen后缀。如:one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen二、从20至90之间表整十的数词都跟后缀-ty。如:twenty,thirty,forty,fifty,sixty,eighty,ninety表示“几使几”用整十加个位数构成,中间用连字符“-”。如:twenty-one,thirty-two,forty-three,fifty-four,ninety-six三、表示几百,几千,几百万,十亿用数词1-9加hundred,thousand,million,billion构成。如:fourhundred,fivethousand,sevenmillion,ninebillion注意:几百几十之间一般用and连接。如:threehundredandforty-nine,sixhundredandseven四、表示不确定的“数百”,“数百万”,“数千”,“数十亿”时,用“hundreds”,“thousands”,“millions”,“billions”加“of”构成。如:Therearehundredsofteachersinourschool.Thousandsofstudentsarestudyinginourschool.4\nThemountainiscoveredwithbillionsoftrees.一、表示顺序的词(序数词)除1-3外,其余的后面都有后缀-th。如:first,second,third,fourth,fifth,ninth,eleventh,twelfth二、整十的序数词后面是由基数词变y为i,再加eth构成。如:twenty→twentieth,eighty→eightieth,ninety→ninetieth其余的整数加个位数构成的词,只变个位数为序数词即可。如:twenty-nine→twenty-ninth,forty-five→forty-fifth,fifty-six→fifty-sixth,sixty-seven→sixty-seventh,ninety-seven→ninety-seventh三、序数词前一般加定冠词the,但有时加不定冠词表示“又一”,“再一”等。如:Ihavetriedtwice.Iwanttotryathirdtime.Hehasfailedthreetimes.Hewilltryafourthtime.四、数词与名词连用时,如几号,几班,几年级,房间号及邮编号码时,首字母都大写。如:NumberOne,ClassThree,GradeTwo,Room218,ZipCode257091五、表示倍数的大小时,两倍用twice表达,三倍以上用数词加times表达。如:Myschoolistwiceaslargeastheirs.Fivetimessevenis35.4\n十、分数的表达:分子基数词,分母序数词,分子大于1,分母加s。如:1/4→onefourth,3/4→threefourths(threequarters),1/5→onefifth,4/5→fourfifths十一、小数的表达,小数点读作point,其余的按基数词读出。如:0.2→zeropointtwo,5.79→fivepointsevennine十二、百分数的表达,百分号读作percent。如:10%→tenpercent,16%→sixteenpercent,0.7%→pointsevenpercent,89%→eighty-ninepercent十三、数词算式表达:+→plus,-→minus,×→multiplied÷→divided。如:5+7→fiveplusseven,9-3→nineminusthree,8×9→eightmultipliedbynine,64÷8→sixtydividedbyeight,6:5→theratioofsixtofive,42→foursquared,33→three-cubed,54→thefourthpoweroffive十四、与数有关的几个常用单词及词组。如:half一半,adozen一打,dozensof几十,ascore二十,scoresof许多,several(afew),几个,数个巩固训练1.About________oftheworkersareyoungman.A.thirdfifthsB.threefifthsC.threefivesDthreefifth4\n2.Thecomputerofthiskindcanwork_______thanthatkind.A.hundredsoftimesfasterB.hundredoftimesfasterC.hundredtimesfasterD.ahundredtimefaster1.Two____________diedofflulastyear.A.hundredoldpeopleB.hundredsofoldpeopleC.hundredsofpeopleD.hundredsoldpeople2.Hegraduatedin_________of__________centrury.A.thesixtieth;twentyB.sixty;thetwentiethC.thesixties;thetwentiethD.sixty;twenty3.Thetwogreatmenwrotethoselettersin__________.A.1870’sB.1870sC.the1870’sD.the18704.IwonderifIcanaskhim____________time.A.fourB.fourthC.thefourthD.afourth答案:1---5BAACD4