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1、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基数词；表示顺序的数词叫序数词序数词。渭塘天天教育Qq:276158535基数词基数词onetwothreefourfivesixseveneightsevensixthreezeroninetwooneeightfourfivenumberssevensixthreezeroninetwooneeightfourfive最基本的数词如下:1one,2two,3three,4four,5five,6six,7seven,8eight,9nine,10ten,11eleven,12twelve,13t
2、hirteen,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。Pleaseopenyourb
3、ooksatpageten.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。Itsthreeoclock.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
4、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
5、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。5.5fivepointfive12.135twelvepointonethreefiveNumbers are widely used.Hello，86861873-Letscount!1-10onetwothree
6、fourfivesixseveneightnineten11-19eleventwelvethirteenforteenfifteensixteenseventeeneighteennineteenLetsreviewtenthirtyfortyseventysixtyOnehundredfiftyninetytwentyeightyDragon1-1001324Look and Read100onehundred1,000onethousand1,000,000onemillion1,000,000,000onebillion1002,00030,000400,0005,000,00060,
7、000,000700,000,0008,000,000,00090,000,000,000100,000,000,000Can you read them?hundredthousandmillionbilliononehundredonethousandtenthousandonehundredthousandonemilliontenmilliononehundredmilliononebilliontenbilliononehundredbillion tens/hundreds/thousands/millions of一一百百一一千千一万一万十万十万一一百万百万一千一千万万一亿一亿十
8、亿十亿一百亿一百亿一千亿一千亿数十数十/百百/千千/百万百万看谁译得快：看谁译得快：,Step1:one hundred and twenty-three billion,Step2:four hundred and fifty-six million,Step3:seven hundred and eighty-nine thousand,Step4:one hundred and three103789456123,625sixhundredandtwenty-five8,961eightthousand,ninehundredandsixty-one95,680ninety-fiveth
9、ousand,sixhundredandeightyLook and PracticeLookandPractice6,302,876sixmillion,threehundredandtwothousand,eightyhundredandseventy-six45,690,510,810forty-fivebillion,sixhundredandninetymillion,fivehundredandtenthousand,eighthundredandten8391What is the largest/smallest 4-digit number?98311389Lets do a
10、 practice!facetofacenumbertonumber序数词的含义序数词的含义表示次序的数词叫序数表示次序的数词叫序数词，是由基数词变化而词，是由基数词变化而来的。来的。one1stfirsttwo2ndsecond3rdthirdthreefour4thfourth序数词的变化序数词的变化1 one-first2 two-second3 three-third4 其余的序数词都是由基数其余的序数词都是由基数词后加词后加-th 变化而来的吗？变化而来的吗？five5thfifthtwelve12thtwelftheight8theighthnine9thninth20thtwen
11、tiethtwenty整十的序数词把整十的序数词把 y 变成变成 i加加-ethtwenty-twentiethCan you read?1thirty-thirtieth2forty-fortieth3fifty-fiftieth序数词的定义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twentie
12、th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119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?
13、（哪一天？）（哪一天？）ItsinJune2nd.JunethesecondWhen is Teachers Day?Its September10th.When is National Day?ItsOctober 1st.WhenisIndependenceDay?美国独立日美国独立日Its_.July 4th基数词变序数词歌基数词变序数词歌基变序，有规律：基变序，有规律：词尾加上词尾加上th（fourth，sixth）一、二、三，特殊记；一、二、三，特殊记；结尾字母结尾字母t，d，d（first，second，third）;八减八减t，九去，九去e（eighth，ninth）;ve要用要
14、用f替（替（fifth，twelfth）;ty将将y变变i；th前面有个前面有个e。若是碰到几十几，若是碰到几十几，前用基来后用序。前用基来后用序。one-firsttwo-secondthree-thirdfour-fourthfive-fifthsix-sixthseven-seventheight-eighthnine-ninthten-tenth序数词twenty-twentieththirty-thirtiethforty-fortiethfifty-fiftiethsixty-sixtiethseventy-seventietheighty-eightiethninety-nine
15、tiethtenthnintheighthseventhsixthfifthfourththirdsecondfirstordinalordinal numbers numberstenthnintheighthseventhsixthfifthfourththirdsecondfirst一、二、三，特殊记，一、二、三，特殊记，加加th从从4起，起，八少八少“t”，九去，九去“e”，“ve”要用要用“f”替，替，(five,twelve)见见“y”变成变成“i”和和“e”，词尾，词尾加上加上“th”，(twenty,thirty,-ninety)若是遇到几十几，只变个位就可若是遇到几十几，只变
16、个位就可以。以。v ordinal numbersordinal numbers(序数词)Can you write their ordinal numbers?254412918721910190401481001000Decemberisthe_monthoftheyear.Mondayisthe_dayoftheweek.Englishisspokenbymostpeopleastheir_languageintheUSA,GreatBritain,Australian,andCanada.TheGamesofthe_Olympicin2008willbeheldinthecityofB
17、eijing.Imhungry.Iveeatenthreeapples.Wouldyoupleasegivemea_one?Atthebeginningofthe_centurytheworldspopulationhaspassed6billion.Hegotoffthisbusandgotona_one.twelfth secondfirst twenty-ninth fourthtwenty-firstsecondPractice:序数词的用法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。Thefistr
18、oundofvotinghasntfinished.第一轮投票还没有结ThefirstquestionIdaskishowyouknewhim?我的第一个问题是你怎样认识他的?Thefifthlessonisveryeasytolearn.第五课很好学。1)序数词119 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。表示数目和顺序的词叫做数词。数词又分基数词和序数词，基数词表示数量，序数词表示顺序。一、二、三特别
19、记,其余后加“th”,five,twelve两兄弟,“f”要将“ve”替,“八”减“t”,“九”去“e”,辅音+“y”改“ie”,“21”以后个位变序。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 January 一月 February 二月 March 三月 April 四月 May 五月 June 六月 July 七月 August 八月