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数词1.基数词2.序数词3.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。thirteenfourteenfifteensixteenseventeeneighteennineteen（3）20-90的整十位数基数词以-ty结尾。twentythirtyfortyfiftysixtyseventyeightyninety（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,000thousandN,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.onehundredandtwo102twohundredandsixteen216fourhundredandfour404513222363999（7）1000以上的数目表示方法。e.g.2,004twothousandandfour34,228thirty-fourthousand,twohundredandtwenty-eight725,369sevenhundredandtwenty-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.twentythousandsonehundredandthirty-fiveB.twentythousandonehundredandthirtyfiveC.twentythousandonehundredandthirty-fiveD.twentythousands,onehundredandthirty-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.fivehundredeighthundred(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.Thousandsoftreesmustbeplantedeveryyear.(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.HewenttotheUnitedStatesinhistwenties.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.Claudeisaneleven-year-oldboy.I‘maeighteen-year-oldgirl.Exercise1、－HowmanypeoplewillcometoBeijingnextyear?(2009芜湖)－It’shardtosay,________people,Ithink.A.millionofB.millionsofC.threemillionsD.threemillionsofExercise2、Inthepasttwentyyears,manytallbuildingshavebeenbuiltinourcity.look!Thisisa______.(09年天津中考)A.70-floorbuildingB.70-floorsbuildingC.70-floorbuildingsD.70floorsbuilding2.序数词的构成基数词onetwothreefiveeightnineTwelve序数词firstsecondthirdfiftheighthninthtwelfth（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。fourfourthsixsixthsevenseventhelevenelevenththirteenthirteenthfourteenfourteenthfifteenfifteenthsixteensixteenthseventeenseventeentheighteeneighteenthnineteennineteenth（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.twentytwentieththirtythirtiethfortyfortiethfiftyfiftiethsixtysixtiethseventyseventietheightyeightiethninetyninetieth（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-sixth98ninety-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-fifth45thonehundredandfifty-third153rdExercise1、---Howoldisyourson?---.WehadaspecialpartyforhisbirthdaylastSunday.A.Nine;ninthB.Nine;nineC.Ninth;nineD.Ninth;ninth2、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.Mustwetryitafourthtime？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-eighthpageRoom302,WorldWarIIExercise1、IgotagoodpresentonmybirthdayandIlikeitverymuch.A.fifteenB.fifteenthC.thefifteenD.thefifteenth2、---IhearyourpenfriendisvisitingLianyungangagain.Isitthetimeforhim?---Yes,andhewillcomeforathirdtimenextspring.A.firstB.secondC.thirdD.fourth3、TherearedaysinJuneanddayisChildren’sDay.A.thirty;thesecondB.thirty;firstC.thirteen;thefirstD.thirty;thefirst4、Thereare_____peopleinmyfamily.Weliveinthe_____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’clock）表示。“半点钟”half，一刻钟用aquarter。e.g.6:00sixo’clock7:15aquarterpastseven8:30halfpasteightExercise1.4:452.8:173.11:584.9:562.表示年、月、日(1)年份1949nineteenforty-nine2005twentyhundredandfivetwothousandandfive1800eighteenhundred（2）日期2008年4月10日April10,2008April10th,200810thApril20082010年9月1日September1,2010September1st,20101stSeptember2010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onehalfonethirdtwothirdsonequarterthreefourths/threequarters2131324143oneandtwothirdstenandthreefifths3215310meterfourfifthsmetermeterstwoandthreefourthsmeters54432（2