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数词【分析解读】数词为中考考点,但是考频不高主要考点为基数词、序数词分数以及hunfred/thousand/million的用法这些用法具有固定性,所以才用的记忆方法比较好【知识方法】基数词的用法序数词的用法年代表达法日期表达法分数的表答法小数的表达法百分数的表达法倍数的表达法知识清单数词英语数词表示数目或者顺序,可分为基数词和序数词基数词表示数量,序数词表示顺序知识梳理:提纲挈领抓住重点和难点!.基数词的构成注意
(1)基数词『12是独立单词,需逐个记忆
(2)基数词13T9是在个位数词的词干后加-teen构成,其中thirteenfifteeneighteen变化不规则
(3)基数词20-90的整十数除twentythirtyfortyfiftyeighty为特殊形式外是在个位数词后面加-ty构成基数词21-99的非整十数是在十位数词后面加上个位数词构成,中间加上连字符如21twenty-one.基数词的读法⑴在读三位数或三位数以上的基数词时,需在十位数之前(若十位数是“0”,在个位前)加连词and304-threehundredandfour1342-onethousandthreehundredandforty-two
(2)阿拉伯数字每三位数就需用一个逗号隔开,从后往前数;所用的英语单词为thousand(千),million(百万),billion(十亿),英语中没有“万”和“亿”,在表示“万”和“亿”时要按十进位法来推算1万可用10千来表示,即10000100000000可写成ahundredmillion35845可写成thirty-fivethousandeighthundred.基数词的基本用法.hundredthousandmillion与billion的用法
(1)与具体数词onetwo…或severalsomemany等车用时,要用单数形式fivehundredpeople500人twothousandbooks2000本书manymilliontrees几百万棵树
(2)与of连用时,要用复数形式,但前面不能再加数词hundredsofpeople成百上千的人thousandsoffactories成千上万的工厂millionsofbirds数以百万计的鸟儿hundredsoftrees几百棵树
二、序数词的构成序数词一般是以与之相应的基数词尾加-th构成,例如fourthtenth但以下的这些基数词变为序数词时有特别之处.onefirsttwosecondthreethirdfivefifthniceninthtwelvetwelfth.以ty结尾的单词,要先变y为I在加-eth.例如thirtythirtiethfiftyfiftieth.以onetwothree等结尾的多位数词,要将各位数变成序数词例如twenty-onetwenty-firstonehundredandoneonehundredandfirst注意序数词前常用定冠词,有时还可以用不定冠词a/an则表示“又一”的意思例如MrBrownhasasecondcar.布朗先生另外还有一辆车Hehastriedasecondtime.他又尝试了一1次
三、数词的应用.时刻的表示小时、点钟、分钟、秒钟要用基数词
①“几点钟”用基数词加oclockoclock可省略如:5点钟—fiveoclock.
②”几点过几分”,W30分钟”用介词past如705—fivepastseven;715—fifteenaquarterpastseven;730—halfpastseven
③“差几分几点”用介词“to”如740—twentytoeight;745—fifteenaquartertoeighto
④日常生活中的时间读法常常简化,直接按基数词的顺序读如705-sevenofive;715-sevenfifteerio.年月日的表示年份用基数词,如1999年一nineteenninety-nine;1900年一nineteenhundred;2000—twothousand;1905-nineteenofive;年用基数词,日用序数词如1998年6月8日写作June81998;读作Junetheeighthnineteenninety-eight或theeighthofJunenineteenninety-eight.世纪、年代表示法在90年代inthenineties在19世纪inthenineteenthcentury在18世纪30年代in1730s或1730s.编号的表示©LessonOne=thefirstlesson第一课;
②BusNo.3=theNo.3bus3路公共汽车;
③表示住所时不用“No.”如302房间一Room302读作roomthreeotwo;
④如果编号的数词比较长,一般用基数词如Page457第457页;
⑤电话号码,用基数词,如3855633—threeeightfivefivedoublefivesixthreethreedoublethreeo.分数的表达分子用基数词,分母用序数词,分子大于T分母则加“s”$□1/3onethird2/3twothirds;另外1/2aonehalf;1/4onefourth或aonequarter;3/4threefourths或threequartersohalfasecond;aquarterofasecond四分之一秒.表示有小数的词用基数词fivepointfive5twelvepointonethreefive.表示百分数5%fivepercentpercent
0.8%zeropointeightpercentpercent..表示有小数的词用基数词
5.5fivepointfive
12.135twelvepointonethreefive
9.其他用法1基数词+单数名词+形容词构成合成形容词如一个五岁的男孩afive-year-oldboy;一座800米长的桥an800-metre-longbridge;女子400米接力girls400-metrerelayrace2具体数词+metres/kilometres/kiloslong/high/tall/deep/away等如长江长6300公里TheChangjiangRiveris6300kilometreslong.3表示〃几十岁〃用序数词,eg.在他三十几岁时inhisthirties4倍数的表达一倍用once两倍用twice两倍以上用基数词+times如5倍fivetimeso例如HeisastallaboyasI.HeisaheadtallerthanI.HeistwoyearsolderthanIChinaisfourtimesaslargeasEurope.Iamtwiceasoldasyou.=1amtwiceolderthanMybooksaretwiceasmanyasyours.Whichisthesmallestnumberofthefour解析
1.基数词hundredthousandmillionbi析ion等前有具体数字时,它们后面不能加s若这些词后面有介词of(几百,成百上千)thousandsof(几千数千个)millionsofbillionsof前不可用数词修饰但可用manysomeseveral等修饰故选答案D..答案Bo此题主要考查序数词的运用.答案C此题主要考查英语中的分数表示法英语中表示分数时,分母用序数词,分子用基数词当分子大于1时,表示分母的序数词后要加s..答案Ao此题主要考查基数词的编号在通常情况下,名词编号有这几种表示法lo事物名词+基数词,且每个单词的首字母都要大写如LessonEleven;2定冠词+基数词+事物名词如No.6MiddleSchool练习与巩固:熟能生巧取得好成绩!选择填空ofpeopleintheworldaresendinginformationbyE-maileverday.A.ManymillionB.SeveralmillionC.SeveralmillionsD.ManymillionsAboutofthesurfaceoftheearthcoveredwithwater.A.threequarterisB.threequartershasC.threequartersisD.threequarterareItwilltaketimetofinishthework.A.oneandahalfyearsB.ayearandhalfC.oneandahalfyearsD.ayearandhalfsHowlongwillyourstayhere、For.A.oneandtwodaysB.oneandtwodayC.adayortwoD.oneortwodayWhenhemovedtoGermanyinhewasalreadyin.A.thefifties;hissixtiesB.fifties;hissixtiesC.thefifties;hissixtyD.fifty;sixtyMybrotherlivesinonfloor.A.sixRoom;secondB.Roomsix;thesecondC.Roomsix;twofloorD.theroomsix;thesecondDecemberismonthoftheyear.A.twelveB.twelfthC.thetwelfthD.thetwelveThistookplaceinthe.A.1940B.1940sC.1940esD.1940thItisonlyfrommyhometothetrainstation.A.tenminuteswalkB.ten-minuteswalkC.tenminutesswalkD.tenminuteswalk
10.ThereareinthisbuildingIliveon.A.ninefloorstheninthfloorB.ninefloortheninthfloorC.ninefloorninefloorsD.ninthfloortheninthfloor
11.ThewaterbehindtheThreeGorgesDams(三峡大坝)shouldbehigherthandownstream(下游)sixty-fivemetersixty-fifthmeterC.sixty-fivemetersD.sixty-fifthmeters
12.Therearedaysinayear.A.threehundredsixty-fiveB.threehundredandsixty-fiveC.threehundredandsixty-fiveD.twohundredsandsixty-five
13.HowmanyteachersarethereinyourschoolA.Hundreds
14.ThereareA.thousandbutrmnotsure.B.HundredC.HundredsofD.OnehundreddoctorsandnursesworkinghardinthatB.twothousandC.twothousandshospital.D.twothousandsof
15.WhatsonefourthandahalfdoyouknowYesitsA.twosixthsB.threefourthsC.onethreeD.threesixth
16.NowchildrenturntopageandlookatthepictureinLessonTwo.A.twentiethoneB.twentyoneC.twentiethfirstD.twentyfirst
17.Bothofthetworulersarebroken.Iwanttobuyaone.A.threeB.thirdC.forthD./
18.Decemberisthemonthinyear.A.twentyB.twelveC.twentiethD.twelfth
19.WhatisthedatetodayIt,sA.ThursdayB.JunethesixteenthC.thebestdayD.Junefifteen
20.SheknowsalotaboutChinaasshehasbeentoChinaA.fortheforthtimeB.fourtimesC.afourthtimeD.forfourtimes1-5CCACA6-10BCBDA11-15CCCDA16-20DBDBB1-911-19整十几十几oneelevententwotwelvetwentytwenty-twothreethirteenthirtythirty-threefourfourteenfortyforty-fourfivefifteenfiftyfifty-fivesixsixteensixtysixty-sixsevenseventeenseventyseventy-seveneighteighteeneightyeighty-eightninenineteenninetyninety-nine基本概念基本用法例句从句子成分上分析,基数词在句Fourofthemwenttothefactory他们中的4个人去了工厂(主语)基数词(表示事物数量)中可用作主语、语)宾语、表语等Iwanttwo.我想要两个(宾Myclassmateiseighteen.我的同班同学18岁了(表语)表示“年、月、日”的时间TheaccidenthappenedonMay表小编rTodaywearegoingtostudy5课HelivesinRoom
801.他住在801房间表示时间,几点钟几点过几分It,stwooclock.现在是两点钟用于四则运算Oneplustwoisthree.1加2等于3Fivetimessixisthirty.5乘以6等于30表示百分数Thirtypercentofthemiswater.它们当中的30%是水。