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数词基数词序数词数词的用法1、基数词的构成（1）1-12的基数词是独立的单词，有其各自的形式。onetwothreefourfivesixseveneightnineteneleventwelve（2）13-19的基数词以-teen结尾。thirteenfour

teenfifteensixteenseventeeneighteennineteen（3）20-90的整十位数基数词以-ty结尾。twentythirtyfortyfiftysixtyseventyeig

htyninety（4）21-90的非整十位数的表示法，是在十位数和个位数之间用连字符“-”。twenty-one21thirty-three33e.g.53647599（5）百、千、百万、十万的表示方法。N00hundredN,000thou

sandN,000,000millionN,000,000,000billione.g.100onehundred2,000twothousand3,000,000threemillion4,000,000,000fourbillion（6）101-999的基数词的表示法，是

在百位数和十位数之间，或在百位数和个位数之间加”and”.e.g.onehundredandtwo102twohundredandsixteen216fourhundredandfour4045132

22363999（7）1000以上的数目表示方法。e.g.2,004twothousandandfour34,228thirty-fourthousand,twohundredandtwenty-eight725,369sevenhundr

edandtwenty-fivethousand,threehundredandsixty-nine17,657,4001,214,000,000巧学妙记一至十二词各异，一个一个单独记，前轻后重（teen）是十几，前重后轻（ty）是几十fourteen,forty分

清楚，thirteen,thirty看仔细，eighteen(eighty)只有一个t,几十几和几百几连字符、and莫丢弃Exercise1、---Excuseme,howdoesthisnumber20,135read?---Itread.A.twentythousandsonehund

redandthirty-fiveB.twentythousandonehundredandthirtyfiveC.twentythousandonehundredandthirty-fiveD.twentythousands,onehundredandt

hirty-fiveExercise2、---Bob,canyouwritethenumbersevenhundredandeightythousandandthirty-two?---Yes,itis_______.A

.78,032B.7,832C.7,032D.780,0322.基数词的运用（1）表示具体数目时，hundred，thousand，million等用单数;e.g.fivehundredeighthund

red(2)表示不确切数目时可以用复数形式，与of连用表示“数以….计的”；hundredsof成百上千thousandsof成千上万e.g.Thousandsoftreesmustbeplantedeve

ryyear.(3)基数词的复数形式可用来表示人的岁数和年代。年代：inthe+年代+s(或’s)表示“在…世纪…年代”inone’s+整10数的复数形式表示一个不确定的年龄e.g.HewenttotheUni

tedStatesinhistwenties.Thatwasintheearlyforties(4)由基数词和名词合成的形容词作定语时，其中的名词只用单数。e.g.Shewroteatwo-thousand-wordcompositionlastnight.Claude

isaneleven-year-oldboy.I‘maeighteen-year-oldgirl.Exercise1、－HowmanypeoplewillcometoBeijingnextyear?(2009芜湖)

－It’shardtosay,________people,Ithink.A.millionofB.millionsofC.threemillionsD.threemillionsofExercise2、Inthepasttwentyyears,manytallbuildingsha

vebeenbuiltinourcity.look!Thisisa______.(09年天津中考)A.70-floorbuildingB.70-floorsbuildingC.70-floorbuildi

ngsD.70floorsbuilding2.序数词的构成基数词onetwothreefiveeightnineTwelve序数词firstsecondthirdfiftheighthninthtwe

lfth（1）第一—第十九的构成。除第一，第二，第三，第五，第八，第九，第十二为特殊形式，其他的序数词均由其对应的基数词加后缀-th构成。fourfourthsixsixthsevenseventhelevenelevenththirteent

hirteenthfourteenfourteenthfifteenfifteenthsixteensixteenthseventeenseventeentheighteeneighteenthninete

ennineteenth（2）整十的数字序数词的构成方法：将对应的基数词结尾y变i，再加-eth.e.g.twentytwentieththirtythirtiethfortyfortiethfiftyfiftiethsixtysixtiethseve

ntyseventietheightyeightiethninetyninetieth（3）表示“几十几”时，十位数的基数词不变，只把个位数变成序数词即可。e.g.36thirty-six第36thirty-sixth98

ninety-eight第98ninety-eighth第55fifty-fifth第74seventy-fourth第88eighty-eighth第1-99（4）百，千，百万等的序数词在词尾加-th。e.

g.第一百hundredth第一千thousandth第一百万millionth第十亿billionth若是多位数，则前边的数用基数词，末尾数用序数词。e.g.第101onehundredandfirst第199onehundredandninety-ninth（5）序数词的缩写形式是

由阿拉伯数字加上序数词的最后两个字母构成的。e.g.first-1stsecond-2ndthird–3rdfourth-4thtwelfth-12thtwenty-first21stforty-fifth45thonehundredan

dfifty-third153rdExercise1、---Howoldisyourson?---.WehadaspecialpartyforhisbirthdaylastSunday.A.Nine;ninthB.Nine;nineC.Ninth;nineD.Ninth;ni

nth2、Ithinkthatthecentury(世纪)willbringusmorehopes.A.twenty-oneB.twentieth-firstC.twenty-firstD.twentieth-one2.序数词的用法(1）在使用序数

词时，通常前面要加定冠词the.e.g.Thesecondlessonismoredifficultthanthefirst.(2)序数词前面出现不定冠词a/an时，表示“再一，又一”。e.g.We’vetireditthreetimes.Mustwetryitafourt

htime？Hisparentshavetwochildren,buttheywantathirdone.(3)序数词前有物主代词或其他修饰语时不用任何冠词。e.g.Thisismyfirstjob.Mrs.Black’ssecondchildcalledLucy.(3)基

数词表顺序，置于名词之后；序数词表顺序，置于名词之前，且与the连用PartTwo-----theSecondPartLessonSeven-----theSeventhLessonpage48-----theforty-eigh

thpageRoom302,WorldWarIIExercise1、IgotagoodpresentonmybirthdayandIlikeitverymuch.A.fifteenB.fifteenthC.thefifteenD.thefifteenth2、---Ihearyourp

enfriendisvisitingLianyungangagain.Isitthetimeforhim?---Yes,andhewillcomeforathirdtimenextspring.A.firstB.secondC.thirdD.fourth3、TherearedaysinJune

anddayisChildren’sDay.A.thirty;thesecondB.thirty;firstC.thirteen;thefirstD.thirty;thefirst4、Thereare_____peopleinmyfamily.Welivei

nthe_____floorinatallbuilding.A.five;sixB.fifth;sixthC.fifth;sixD.five;sixth5.Wearegoingtolearn_____nextweek

.A.LessonTwelveB.LessonTwelfthC.TwelfthLessonD.thelessonTwelfth3、数词的运用1.表示时间（1）先读钟点数,后读分钟数。e.g.10:10tenten4：25fourtwenty-five6：43sixforty-

three(2)用介词past表示几点过几分（不超过半时）；用to表示差几分到几点。e.g.4:20twentypastfour8:42eighteentonine60-42=189:50tentoten10:10tenpastten(3)整点直接用（+o’cloc

k）表示。“半点钟”half，一刻钟用aquarter。e.g.6:00sixo’clock7:15aquarterpastseven8:30halfpasteightExercise1.4:452.8:173.11:58

4.9:562.表示年、月、日(1)年份1949nineteenforty-nine2005twentyhundredandfivetwothousandandfive1800eighteenhundr

ed（2）日期2008年4月10日April10,2008April10th,200810thApril20082010年9月1日September1,2010September1st,20101st

September2010英语中一般用月、日、年或日、月、年来表示。日期可以用基数（读做序数词）。Exercise1.19982.20153.1999年3月3日4.2015年7月24日3.表示分数(1)分数的表达分子>1分母复数onehalfo

nethirdtwothirdsonequarterthreefourths/threequarters2131324143oneandtwothirdstenandthreefifths3215310meterfourf

ifthsmetermeterstwoandthreefourthsmeters54432（2）分数的用法“分数+of+名词/代词”作主语时，谓语动词的单复数取决于名词。e.g.Twothirdsofthestuden

tsareboysinmyclass.Onehalfofhermoneyisspentonbooks.Exercise1.About______oftheworkersintheclothesfacto

ryarewomen.A.thirdfifthsB.thirdfifthC.threefifthsD.threefifth2.Weallknowthat____oftheearth____coveredbysea.A.thr

eefourth;isB.threefourths;isC.threefourths;areD.thirdfour;is4.倍数表示三或三倍以上的倍数用“基数词+times”。e.g.Thisappleistwiceaslargeasthatone.Thisroomisthreetim

eslargerthanthatone.5.数词前加every，表示“每一段时间或每隔一段时间。e.g.everytendays每十天everyninthday每隔九天everyfourweeks每四个星期everythirdweek每隔三个星期6.表示小数和百分数(1)小数用基数词来表达，

以小数点为界，左边的数字为一个单位，表示整数，数字合起来读；小数点右边的数字为一个单位，表示小数，数字分开读。e.g.1.03onepointothreezero10.23tenpointtwothree25.67tw

enty-fivepointsixseven(2)百分数百分数用“基数词+percent”表示。e.g.50%fiftypercent34.67%thirty-fourpointSixsevenpercent0.12%zeropo

intonetwopercent7.排列顺序基数词和序数词都能表示排列顺序。事物名词+基数词the+序数词+事物名词e.g.第一部分Partone=thefirstpart第一课Lessonone=thefirstlesson第三

组Groupthree=thethirdgroup1.0.49pointfournine2.1.5onepointfive3.8.67eightpointsixseven4.30.6thirtypointsix5.17.42%seventeenpointfourtwope

rcent6.9.57%ninepointfivesevenpercentExercise8.其他用法（1）基数词表示年龄inone’s+基数词复数e.g.fiveyearsoldinone’sfortiesMyeldersisterisseventeenandmyyoungersis

teristen.Myuncleisinhisthirties.I‘meighteen.(2)表示房间号和电话号码e.g.202roomtwootwo404roomfourofour303-2244Threeothreed

oubletwofourfour(3)页码数，行数e.g.第10页：pageten第25页：pagetwenty-five第109页：pageonehundredandnine第6行：linesix第29行：linetw

enty-nine