语法专项突破专题四数词考点一基数词(表数量)数字基数词形式例词0~12各自独立zero0;one1;nine9;twelve1213~193~9+重读teen结尾特殊:thirteen13;fifteen15;eighteen18一般:fourteen14;sixteen1620~90整位数以ty结尾twenty20;thirty30;forty40;fifty50;eighty80两位数(几十几)整位数个位数thirtyfive35三位数(几百几)...hundred+and+两位数sixhundredandsixtysix666多位数从右向左数起,每隔三位数加一个逗号,依次读作thousand(千)、million(百万)、billion(十亿),逗号中间按三位数读89,696,787,656eightyninebillion,sixhundredandninetysixmillion,sevenhundredandeightyseventhousand,sixhundredandfiftysix考点二序数词(表顺序)数字序数词变化规则例词1、2、3不规则变化first,second,third4~19基数词尾加th特殊:fifth第五;eighth第八;ninth第九;twelfth第十二;一般:fourth第四;nineteenth第十九20~90整位数ty变为tie再加thtwenty→twentieth;ninety→ninetieth两位数或多位数(整数除外)只变个位数(hundred,thousand等只在词尾加th)twentythird第23;onehundredandfifty-ninth第159;hundredth第100【提醒】(1)序数词要加定冠词the,但若序数词前有形容词性物主代词或名词所有格时省略the。Thisisourfirstlesson.这是我们的第一节课。(2)序数词前加a/an表示“又一,再一”。EventhoughtheBrownshave3children,theystillwantafourthone.尽管布朗夫妇已有3个孩子,可他们还想再要一个。考点三分数1.分数的表达(1)分子用基数词,分母用序数词;如果分子大于1,分母要用复数形式。3/4threefourths4/5fourfifths(2)在英语中,“四分之一”常表示为aquarter;“四分之三”表示为threequarters;“二分之一”表示为ahalf。(3)百分数的表达方式是:基数词+percent。Fortypercentofthestudentsinourclassarefromcities.我们班有40%的学生来自城市。2.分数的用法“分数+of+限定词+名词复数”作主语时,谓语动词应用复数形式;“分数+of+限定词+不可数名词/名词单数”作主语时,谓语动词应用单数形式。但“分数+of+限定词+population”作主语时,谓语动词应用复数形式,此时population意为people。OnehalfofthestudentsarefromChinainthisschool.这所学校一半学生来自中国。Twothirdsofhermoneyisspentonclothes.她把三分之二的钱花在了衣服上。ThreefourthofthepopulationinSingaporeareChinese.新加坡四分之三的人是中国人。11.(2012湖南郴州中考,34)Lastyear,onehundredEnglishteacherstookpartinthe______EnglishSummerTraining.A.twomonthB.twomonthsC.twomonths2.(2012湖南郴州中考,29)—LiJiachengplanstogive______ofhismoneytothecharity.—Really?Whatakindmanheis!A.onethirdB.onethreeC.onethirds3.(2012四川广安中考,26)—Guang'anisabeautifulcity,isn'tit?—Yes.Thereareabouttwo______visitorshereeveryweek.A.thousandsofB.thousandsC.thousand4.(2012四川南充中考,30)Ithink______shouldnotbeallowedtodrive.A.sixteenyearsoldB.sixteenyearoldC.sixteenyearolds5.(2012广东佛山中考,34)ThreestudentsranfasterthanLilyintherace.Lilywas______.A.thefourthB.fourC.thethird6.(2011湖北恩施中考,32)Hewrotehis______novelwhenhewas______.A.five;fiftiesB.fifth;fiftyC.fifth;fiftieth7.(2012四川自贡中考,23)—IhearyourfriendisvisitingSanyaagain.Isitthesecondtimeforhim?—Yes,andhewillcomefor______timenextspring.A.athirdB.asecondC.thethird8.(2012福建宁德中考,34)—Excuseme,whichisthewaytothemuseum?—Sorry,Idon'tknow.Thisismy______timehere.A.firstB.secondC.third9.(2012福建南平中考,27)ThankstoProjectHope,______childrenhavebetterlives.A.thousandsofB.thousandsC.thousand10.TheworkistoodifficultforMrZhutofinishinaweek.Heneeds______days.A.moretwoB.twomoreC.twoanother11....