初三英语下学期数词

数词的用法及练习英语复习考点揭密1.掌握数词的定义及分类；2.掌握基数词的构成及用法；3.掌握序数词的构成及特殊形式的序数词，了解并能够运用数词的其他用法。数词(基数词)表示数量的多少

(序数词)表示人和事物的顺序数词就是表示事物的数量和顺序的词,分基数词和序数词两种。基数词(cardinalnumbers)的构成及用法:1.1~12的基数词是独立单词,无规律可循。eleventwelve2.13~19的基数词一般在3~9对应的基数词后加-teen构成，注意：thirteenfifteeneighteen3.20~90八个整十位数以后缀-ty结尾。注意：

twenty(20)thirty(30)forty(40)eighty(80)4.“几十几“的基数词由十位数和个位数中间加连字符“-”构成：twenty-nineninety-seven5.百位数和十位数之间，在英国英语要用“and”连接，在美国一般不用。

threehundredandfivefourhundredandforty-five

6.英语中“万”及以上的表示法：53,461fifty-threethousand,sixhundredandforty-one30,045,310thirtymillionandforty-fivethousand,threehundredandten

7.hundred,thousand,million,billion前有确切数词时，遵循“两个无”原则，即无“s”，无“of”。threehundredpeopleninemillionbooks8.但hundred,thousand,million,billion前无确切数词时，则遵循“两个有”原则，即有“s”和“of”。manythousands

oftreesmillions

ofbirdstensofthousands

ofsoldiersthreehundredspeoplethreehundredofbooks9.基数词常与名词连用构成复合定语，中间要用连字符，而且只用名词的单数形式．an800-hundred-wordcompositionafive-weekholidaya20-meter-tallbuilding10.基数词可以表示年代、时刻、住所、房间、教室、电话号码等。inthe1980’s(1980s)inthenineteeneightiesPagethreeRoom403atseventhirtyin1991(innineteenninety-one)

inone’sfifties(在某人50多岁的时候）注意下列习惯表达方式：halfanhourhalfakilotwoandahalfkilos=twokilosandahalfoneortwodays=adayortwoeightymeterslongonethousandmilesawayfivemetersdeep(wide/tall/high/long)fivemetersindepth/width/height/length序数词(ordinalnumbers)的构成及用法:基数词one,two,three的序数词分别为:first,second,third(1st2nd3rd)2.从第四到第十九的序数词在基数词后加“-th”．注意：fiftheighthninthtwelfth3.十位整数基数词的序数词需将词尾的“y”改为“i”，再加“eth”构成．twentytwentieth

fortyfortiethninetyninetieth4.“几十几”的数及４位数以上基数词的序数词只将个位变成序数词即可．onehundredthonethousandthfourhundredandthirty-second5.日期的表达一般用序数词．３月８日March8(th)读作：Marchtheeighth6.用于最高级前表示“第二、第三…“thesecondmostusefulthethirdlargestcity7.second,third等与“a“连用，表示”又一，再一”．再一次asecondtime8.在…世纪：inthetwenty-firstcenturyinthenineteenthcentury概数的表示法Over/above/morethan+数字或：数字＋odd(…多／以上）

over/morethantwoyears(两年多）

abovetwentypounds(２０磅以上）

thirtyoddyears(30多年）2.below/under/lessthan+数字（不足／不到…，…以内）belowsixdaysundertwohourslessthan60miles3.about/nearly/some/toward(s)/moreorless+数字数字＋orso/moreorless(大约／近…，…上下／左右）

about90yardsnearlyonetenthsomefiftyfeetninekilosorsomoreorless20meters/20metersmoreorless“每隔”与“每逢”的表示法：两种结构：

every+基数词＋复数名词every+序数词＋单数名词everyfourdayseveryfourthday每四天（每隔三天）everythreelineseverythirdline每三行（每隔二行）每隔一天：everyotherdayeverytwodayseveryseconddayThebusrunseveryfiveminutes.Oneineverytwentystudentsistobechosenastherepresentative.一些数学公式、小数和分数的表示法：7X3=21Seventimes/multipliedbythreeistwenty-one.9÷3=3Ninedividedbythreeis3.3.5threepointfive½a(one)half1/3onethird¼a/onefourtha/onequarter4/5fourfifths12/23twelvetwenty-thirds英、美楼层的不同表示法：美英汉firstground一层secondfirst二层thirdsecond三层一、表示事物的编号基数词放在名词的后边，该名词一般要大写；序数字放在名词的前面，加定冠词。如：Lesson1/thefirstlessonRow3/thethirdlesson二、年、日、时刻的表达方法1、“年”用基数词，“日”用序数词，前面要加定冠词。读的顺序是月、日、年。如：1999年5月2日读作：Maythesecond,nineteenninety。2、“时刻”用基数词表达，同时要注意以下几点：1）表示“整点”时，在基数词后加o’clock,如：9o’clock.数词的用法:2）分钟小于或等于30分钟的，用“分钟数+past+钟点数”形式；如分钟数大于30分钟的，用“到下一个分钟数所差的分钟数+to+下一个分钟数”形式；也可以依次读钟点数和分钟数。如：7:20twentypastseven或seventwenty3)注意表示两个特殊的表示分钟的单位词；30分钟用half,15分钟用aquarter。如：6:30读作：halfpastsix5:45读作：aquartertosix6:15读作：aquarterpastsix三、分数的表达方法：表示分数时，分子用基数词，分母用序数词，分子大于1，分母用复数；分数修饰名词时，后面用短语。

如：onethirdofteachersthreeseventhsoftheboys

½¼分别用ahalf和aquarter表示。四、“基数词-名词-形容词”只能用在名词前作定语。如：sheisa3-year-oldgirl.Theyliveina7-storey-highbuilding.注：这种结构中名词不能用复数，同时只能作定语，用作表语时，不用连字符，名词用复数。如：Jimis10yearsoldthisyear.Jimisa10-year-oldboy.专题例析:例1Thenumber2,146isreadas__________.A.twothousandsandonehundredandfortyandsix.B.twothousandandahundredandforty-six.C.twothousand,onehundredandforty-six.D.twothousands,onehundred,forty-six.分析:英语数字的读法是有规律的,百位跟十位之间加and,十位与个位用连字符,三位以上的数用逗号分开,第一个逗号代表thousand等.根据数字的读法,可以找出正确答案为C.例2Thereare_____peopleinmyfamily.Weliveinthe_____floorinatallbuilding.A.five;sixB.fifth;sixthC.fifth;sixD.five,sixth分析:第一个空表示数量用基数词,第二个空表示顺序用序数词,选D.例3——Excuseme,howdoesthisnumber20,135read?

——Itreads___________.A.twentythousandsonehundredandthirtyfiveB.twentythousandonehundredthirtyfiveC.twentythousand,onehundredandthirty-fiveD.twentythousands,onehundredandthirty-five分析：根据数字的读法规律，选C。例4Inourclass______ofthestudentsaregirls.A.threefifthsB.threefifthC.thirdfiveD.thirdfifths分析：根据分数的表达方法，分子用基数词，分母用序数词，分子大于1，分母用复数可以找到正确答案为A。【例1】Whichisthesmallestnumberofthefour?______A.AhalfB.AquarterC.TwothirdsD.Three-fourths典型例题解析【例2】Davidhas_________cat.It‘sverynice.［2003，四川］A.aB.anC.theBA【例3】A_________schoolboy,LiLida,firsttriedtocrosstheQiongzhouChannelinJune，2000.［2003，呼和浩特］A.12-year-oldB.12-years-oldC.12-year-oldD.12-years-old【例4】ItissaidthatSARShaskilledmorethan_________peopleworldwide.［2003，杭州］A.threehundredsB.threehundreds'C.threehundred'sD.threehundred【例5】_________sunisshiningbrightly.［2003,吉林］A.AB.AnC.TheD.不填ADC专题训练:Thisabigclass,and______ofthestudentsaregirls.A.twothirdB.secondthreeC.twothirdsD.twothreeThequestionsisveryeasy,evena_____childcananswerit.A.three-yearsoldB.threeyearsoldC.three-year-oldD.threeyearold3.The_____manontheleftisBeckman,afamousfootballplayer.A.twoB.secondC.three4.——Whichclasswonthematchintheend?——I’mnotsure.Maybe_____did.A.ClassThirdB.ClassThreeC.thirdthreeD.ClassThreeCCBD5.Nine_____poundsaweek?That’sverygood.A.hundredofB.hundredsofC.hundredsD.hundred.6.Sharkshavebeenontheearthfor_____years.A.thousandsofB.twothousandsC.twothousandsofD.thousandof7.______peoplecometoJilintovisitMountChangbaieveryyear.A.ThousandsofB.ThousandofC.ThousandsD.Thousand8.Thecomputerwascheap.Ispentonlytwo_____yuanonit.A.thousandsB.thousandC.thousandsofD.thousandofDAAB9.About_____oftheworkersintheclothesfactoryarewomen.A.thirdfifthsB.thirdfifthC.threefifthsD.threefifth10.Theroadisover______metreslong.A.sixhundredsandfifty-twoB.sixhundredandfifty-twoC.sixhundred,fifty-twoD.sixhundred,fiftyandtwo11.Septemberis_____monthoftheyear.A.ninthB.eighthC.theeighthD.theninth12.It’sabout______kilometresfromNanningtoBeijing.A.twothousandfivehundredandsixtyB.twothousandfivehundredsandsixtyC.twothousandsfivehundredandsixtyD.twothousandsfivehundredsandsixtyCBDA13.Everyyear,______fishesarekilledbythepollutedwater.A.millionofB.millionsofC.twomillionsofD.twomillions14.Theboytoldtheoldwoman,“Thetrainwillarriveattwototwo.”Itmeans______.A.2:02B.2:20C.1:58D.1:4015.Sarasaidwewouldmeetat_____infrontofthemuseum.A.onethirtyB.halfanhourC.oneandthirtyD.onepastthirty16.We’llhavea_____holidayaftertheexam.A.twomonthB.two-monthC.twomonth’sD.two-monthsBCAB17.Nowchildren,turntopage______andlookatthe_____pictureinLessonTwo.A.twentieth;oneB.twenty;oneC.twentieth;firstD.twenty;first18.Todaywearegoingtolearnthe____lesson.A.twentyB.twentithC.twentiethD.twentyth19.Dinosaureggswerefoundinthe_____.A.1990B.1990thC.1990sD.1990s’20.——HowoftendoItakeit?——______.A.twiceB.twiceadayC.twiceonedayD.intwicedaysDCCBⅡ.用英语写出下列各题。1.1978年9月12日_________________________________________2.三点半__________________________________________3.八点差一刻___________________________________________4.2，973，608______________________________________________________________________________________5.第二十层___________________________________________课时训练Septemberthetwelfth,nineteenseventy-eighthalfpastthreeaquartertoeighttwomillion,ninehundredandseventy--threethousand,sixhundredandeightthetwentiethfloor用适当的数词填空（InEnglish）：1．－What’s11plus20?

－It’s__________.2．Chinahasthelargestpopulation.Butwhichcountryhasthe__________largestpopulation?3．Septemberisthe__________monthoftheyear.4．－Whatclassareyouin?

－I’minClass__________(8).5．Thereare________minutesinanhour.thirty-onesecondninthEightsixty6．ThePRCwasfoundedonOctober1,1949.HowwillyousaythisyearinEnglish?_____________________7．Hishairturnedwhitewhenhewasonlyinhis__________(40s).8．Thetrainwillleaveat9:00.It’s7:30now.Wehavestill_____________left.9．____________(3/4)ofthelandiscoveredbyforestsinHolland,thecountryofflowers.10．Dinosaursdisappearedabout________________(65000000)yearsago.nineteenforty-ninefortiesoneandahalfhoursThreequarterssixty-fivemillion根据句意填空1.Theyalwaysgotothelibrary

(one)aweek.2.Theytrieda

(five)time,butwithoutluck,theyfailedagain.3.Thereare

studentsinourclass,twenty-twoboysandtwenty-twogirls.4.Ourteacheroftentellsusthatworkmustcomes

______.5.Thereare

floorsinthebuilding.Andweliveonthe

floor.(19)6.Macaoreturnedtoourmotherlandattheendofthe

________century.7.About

oftheworkersinthatsteel-worksareyoungpeople.(3/5)oncefifthforty-fourfirstnineteennineteenthtwentieththreefifths1.—Where's_________mathsteacher?—He'stalkingwithSam'sfather.A.aB.anC.theD.／2.Thoughthefirstletteris_________“u”intheworlduseful,wemustsay“_________usefulbook”.A.a,aB./,aC./,anD.an,an3.WangQingisa_________boy.A.five—years--oldB.five—year--oldC.fiveyearoldD.fiveyearsold4.Wecansee_________starsatnightifitdoesn'train.A.thousandB.thousandsC.thousandsofD.thousandof5.Wearethirsty.Pleasegiveme_________.A.twocupsofteaB.twocupsteaC.twocupofteasD.twocupsofteas课时训练CABCA6.Ihave_________orange.Youmaydrinkit.A.alittleB.afewC.fewD.little7.Thelowtempertarewillbeminus5.

Theunderlinedparemeans_________A.5B.-5C.0.5D.＜58.I'mafraidwehavetoget_________forthemeeting.A.twentymorechairsB.moretwentychairsC.twohundredschairsD.twentyonechairs9.WhenisChristmasDay,doyouknow?___________.A.October1stB.June1stC.November25thD.December25th10.—Whichis_________secondlongestriverinChina?—YellowRiver.A.a,/B.the,TheC.the,/D./,A课时训练(A)(B)(A)(D)(B)11.Whatwasthedateyesterday?Itwas_________.A.FridayB.afinedayC.July1stD.200312._________istheeasiestofall.A.LessononeB.TheLessononeC.LessonFirstD.FirstLesson13.Therearetallbuildingson_________sideofthestreet.A.everyB.eitherC.bothD.all14.Ifyoulikethechicken,youcanhaveas_________asyoucan.A.muchB.manyC.moreD.little15.Wouldyoulike_________bread?A.anotherB.otherC.somemoreD.muchmore课时训练CABAC16.XiaoMaoandDaMaoarein

.A.teamFourthB.theteamFourC.TeamFourD.Fourteam17.Wereyou

tocometomyofficelastnight?A.thetwooneB.thesecondoneC.secondstudentD.twoone18.Sorry,

hadbeensoldout.A.42size