小学英语语法系列基数词-15序数词详细讲解-下载

什么是数词？•表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。•基数词onetwothreefourfivesixseveneightsevensixthreezeroninetwooneeightfourfivenumberssevensixthreezeroninetwooneeightfourfive最基本的数词如下:•1one,2two,3three,4four,5five,6six,7seven,8eight,9nine,10ten,11eleven,12twelve,13thirteen,14fourteen,15fifteen,16sixteen,17seventeen,18eighteen,19nineteen,20twenty,30thirty,40forty,50fifty,60sixty,70seventy,80eighty,90ninety,•100ahundred,1,000athousand,1,000,000amillion,1,000,000,000abillion.从事物内容上分析，基数词用在下列情况。•1)编号的事物用基数词。•TodaywearegoingtostudyLessonFive.今天我们要学习第五课。•Pleaseopenyourbooksatpageten.请打开书，翻到十页。•WeliveinRoom101.我们住在101房间。•2)表示“年，月，日”时用基数词。•Theaccidenttookplacein1982.这次事故发生在一九八二年。•IwasborninOct.11,1956.我出生在一九五六年，十月，十一日。•YoucouldseemanyflowersinJune.六月份你可以看到好多花。•3)表示“几点钟，几点过几分”用基数词。•It'sthreeo'clock.现在是三点钟。•Itistwototwo.现在是两点差两分。•WearrivedinBeijingatfivetoseven.我们七点差五分到达北京。•4)用于加减乘除的数字用基数词。•Oneplustwoisthree.一加二等于五。•Eightminusfourisfour.八减四等于四。•Twotimestwoisfour.二乘二等于四。•Tendividedbytwoisfive.十除以二等于五。•5)表示大几倍或者小几倍用基数词。•Thisriveristwotimeslongerthanthatone.这条河比那条河长两倍。•Thisboxisfivetimeslessthanthatone.这个盒子比那个盒子小五倍。•Fivetimessixisthirty.五乘以六得三十。•6)表示百分数用基数词。•Thirtypercentofthemiswater.它们当中有30%的水。•Eightypercentofwhathesaidistrue.他的话有80%是真实的。•7)表示分数时，分子数字用基数词,但分母要用序数词,如分子不是1，序数词要用复数形式。•One-fifthofthebooksaremine.三分之一的书是我的。•Three-tenthsofwaterisdisappeared.十分之三的水不见了。•8)表示有小数的词用基数词。•5.5fivepointfive•12.135twelvepointonethreefiveNumbersarewidelyused.Hello，86861873---Let’scount!•1-10•onetwothreefourfive•sixseveneightnineten11-19eleventwelvethirteenforteenfifteensixteenseventeeneighteennineteenLet’sreviewtenthirtyfortyseventysixtyOnehundredfiftyninetytwentyeightyDragon•1-1001324LookandRead100onehundred1,000onethousand1,000,000onemillion1,000,000,000onebillion1002,00030,000400,0005,000,00060,000,000700,000,0008,000,000,00090,000,000,000100,000,000,000Canyoureadthem?hundredthousandmillionbilliononehundredonethousandtenthousandonehundredthousandonemilliontenmilliononehundredmilliononebilliontenbilliononehundredbilliontens/hundreds/thousands/millionsof一百一千一万十万一百万一千万一亿十亿一百亿一千亿数十/百/千/百万看谁译得快：,Step1:onehundredandtwenty-threebillion,Step2:fourhundredandfifty-sixmillion,Step3:sevenhundredandeighty-ninethousand,Step4:onehundredandthree103789456123,,625sixhundredandtwenty-five8,961eightthousand,ninehundredandsixty-one95,680ninety-fivethousand,sixhundredandeightyLookandPracticeLookandPractice6,302,876sixmillion,threehundredandtwothousand,eightyhundredandseventy-six45,690,510,810forty-fivebillion,sixhundredandninetymillion,fivehundredandtenthousand,eighthundredandten8391Whatisthelargest/smallest4-digitnumber?98311389Let’sdoapractice!facetofacenumbertonumber序数词的含义表示次序的数词叫序数词，是由基数词变化而来的。one1stfirsttwo2ndsecond3rdthirdthreefour4thfourth序数词的变化•1one-----first•2two------second•3three----third•4其余的序数词都是由基数词后加-th变化而来的吗？five5thfifthtwelve12thtwelftheight8theighthnine9thninth20thtwentiethtwenty整十的序数词把y变成i加-eth•twenty----twentiethCanyouread?•1thirty----thirtieth•2forty----fortieth•3fifty-----fiftieth序数词的定义•表示数目顺序的词用序数词。例如:first第一，fifth第五序数词的构成•first第一second第二third第三fourth第四fifth第五sixth第六seventh第七eighth第八ninth第九tenth第十eleventh第十一twelfth第十二thirteenth第十三nineteenth•第十九twentieth第二十•fortieth第四十fifty-first第五十一eight-third第八十三•ninety-fourth第九十四•1)序数词1—19除第一，第二，第三，第五，第八，第九，第十二变化不规则外，其余均由在基数词后加上-th。•2)十位整数的序数词的构成方法是,是将十位整数基数词的词尾y变成i再加-eth。•3)几十几的序数词，只是把个位数变成序数词，十位数不变。•为了更简单地记忆，你只要记住下面这个基数词变序数词口诀就可以了：•1，2，3全都变，9少e，8少t，ve变f，ty变成tie，th最后加上去。•A:Whenisyourbirthday?B:Mybirthdayisin.Whichday?（哪一天？）It’sinJune2nd.JunethesecondWhenisTeacher’sDay?It’sSeptember10th.WhenisNationalDay?•It’sOctober1st.WhenisIndependenceDay?美国独立日It’s______.July4th基数词变序数词歌基变序，有规律：词尾加上th（fourth，sixth）一、二、三，特殊记；结尾字母t，d，d（first，second，third）;八减t，九去e（eighth，ninth）;ve要用f替（fifth，twelfth）;ty将y变i；th前面有个e。若是碰到几十几，前用基来后用序。•one---firsttwo---secondthree---thirdfour---fourthfive---fifthsix---sixthseven---seventheight---eighthnine---ninth•ten----tenth序数词twenty---twentieththirty---thirtiethforty---fortiethfifty---fiftiethsixty---sixtiethseventy---seventietheighty---eightiethninety---ninetiethtenthnintheighthseventhsixthfifthfourththirdsecondfirstordinalnumberstenthnintheighthseventhsixthfifthfourththirdsecondfirst一、二、三，特殊记，加th从4起，八少“t”，九去“e”，“ve”要用“f”替，(five,twelve)见“y”变成“i”和“e”，词尾加上“th”，(twenty,thirty,---ninety)若是遇到几十几，只变个位就可以。ordinalnumbers(序数词)Canyouwritetheirordinalnumbers?254412918721910190401481001000•Decemberisthe________monthoftheyear.•Mondayisthe_______dayoftheweek.•Englishisspokenbymostpeopleastheir_______languageintheUSA,GreatBritain,Australian,andCanada.•TheGamesofthe_____________Olympicin2008willbeheldinthecityofBeijing.•I’mhungry.I’veeatenthreeapples.Wouldyoupleasegivemea_______one?•Atthebeginningofthe_____________centurytheworld’spopulationhaspassed6billion.•Hegotoffthisbusandgotona______one.twelfthsecondfirsttwenty-ninthfourthtwenty-firstsecondPractice:序数词的用法•序数词主要用作定语，表语。前面要加定冠词the。•YouarethefirstoneIbelieve.你是我最相信的人。•Thefistroundofvotinghasn'tfinished.第一轮投票还没有结•ThefirstquestionI'd