八年级英语上册-Unit-2-Numbers-grammar课件.ppt

Unit2Numbers,Grammar,Lead-in:answerquestions.,1Howoldareyou？Im13yearsold.2Whatsyourtelephonenumber?Mytelephonenumberis27227854.3Howmanystudentsinyourclass?Howmanystudentsinyourgrade?Thereare52studentsinmyclassandabout310studentsinourgrade.4Inwhichyearwereyouborn?In1999/2000/2001.以上的数字都是基数词（cardinalnumbers）.,A.Doyouknow!Cardinalnumbers,12345678,17181920,111213141516,910,3040528598,onetwothreefourfivesixseveneight,nineten,eleventwelevethirteenfourteenfifteensixteen,seventeeneighteennineteentwentythirtyfortyfifty-twoeighty-fiveninety-eight,基数词的构成,1）112,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13-19,由39+teen构成。14fourteen16-sixteen17-seventeen19nineteen特殊拼写:13thirteen15-fifteen18eighteen3）2090,以-ty结尾。20twenty30-thirty40forty50fifty80-eighty60-sixty70-seventy90ninety4）2199，两位数，十位与个位之间有“”。21twentyone55fiftyfive99ninetynine,Letsplayagame：报数,Saynumbersonebyoneaccordingtotheseatorder.按照座位顺序一个接一个报数。报错数的同学站着，并要在小组得分上扣一分。,100,375,200,onehundred,twohundred,threehundredandseventy-five,642,958,236,sixhundredandforty-two,ninehundredandfifty-eight,twohundredandthirty-six,5）101999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three,29,431,500,7,6,thousand,hundred,million,billion,and,6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,million,billion,基数词的构成,Readthefollowingnumbers.,2,534,25,342,253,423,2,534,233,twothousandfivehundredandthirty-four,twenty-fivethousandthreehundredandforty-two,twohundredandfifty-threethousandfourhundredandtwenty-three,twomillionfivehundredandthirty-fourthousandtwohundredandthirty-three,534,fivehundredandthirty-four,2,250,342,330,twobilliontwohundredandfiftymillionthreehundredandforty-twothousandthreehundredandthirty,A.letsreadit.,1000,15，362,4,189,onethousand,fourthousandonehundredandeighty-nine,fifteenthousandthreehundredandsixty-two,100，000,285，643,onehundredthousand,twohundredandfifty-eightthousandsixhundredandforty-three,A.Cardinalandordinalnumbers,1,000,000,3,367,982,onemillion,threemillionthreehundredandsixty-seventhousandninehundredandeighty-two,Workouttherule,Inthecardinalnumbers,wedonotadd-stohundred,_and_.Withlargenumbers,weput_betweenhundredandten.,thousand,million,and,注意：表示具体、准确的数目时，hundred,thousand,million等数词后不能加-s,如fivehundred,sixthousand,sevenmillion等。当hundred,thousand等数词与of连用，表示不具体、不准确的数目时，词尾须加-s。如：thousandsofstudents,millionsoftrees.,1、“几十”的复数形式可以表示：几十多岁-in+ones+数词复数年代-in+the+数词复数1)Hediedinhisforties四十多岁2)Inthenineties,mostpeoplegotoworkbybike.90年代,2、“基数词+名词”的合成形容词作定语，中间有连字符“”,当中的名词用单数。a3yearoldgirlaseven-dayholiday,3、表计量-“基数词+度量单位+形容词”Theclassroomis7meterslong,6meterswideand3metershigh.,基数词的用法,A.Cardinalandordinalnumbers,1st2nd3rd4th5th6th7th8th,17th18th19th20th,11th12th13th14th15th16th,9th10th,21st33rd40th100th,firstsecondthirdfourthfifthsixthseventheighth,ninthtenth,eleventhtwelfththirteenthfourteenthfifteenthsixteenth,seventeentheighteenthnineteenthtwentiethtwenty-firstthirty-thirdfortietyhundredth,序数词的构成,1)13,first,second,third。2)419,相应基数词+th,特殊拼写:fifth,eighth,ninth,twelfth。3)2090,y变成ie+th,如twentieth。4)2199,只把个位的基数词变成序数词如twenty-first。5)序数词缩写-数字最后两字母如1st,2nd,3rd,4th,基变序,有规律,一、二、三，特殊记，面目全非要注意，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。序数词缩写记清楚,数字后跟两字母。,(序数词构成规律),Workouttherule,Weformmostordinalnumbersbyadding_tothecardinalnumbers.Thereareexceptions,likefirst,secondandthird.,th,Practicemakesperfect!,1(2)_3412(6)_2328,MayAlanDannyJanePeterAliceSteveZoe,Mayisthe(1)_.Alanisthesecond.Dannyisthe(3)_.Janeisthe(4)_.Peteristhe(5)_.Aliceisthenineteenth.Seveveisthe(7)_.Zoeisthe(8)_.,first,third,fourth,twelfth,twenty-third,twenty-eighth,2,19,序数词前加定冠词the,1999nineteenninety-ninetwothousandandeight1949年10月1日读作:October(the)first,nineteenforty-nine(月-日，年)thefirstofOctober,nineteenforty-nine（日-月，年）写作:October1st,1999(日用缩写，月-日-年)October1,1999(日用数字)1stOctober,1999日-月，年,年份、日期表达法,年用基数词表示,两位一读,介词用in日用序数词表示,介词用on,表示“在世纪”,用序数词。在20世纪写作：in20thcentury读作：inthetwentiethcentury,常考点，易错点,第1单元,第5课Unit1/thefirstunit/LessonFive/thefifthlesson302号房Room3029个生日，第9个生日,我的第9个生日nineparties,theninthparty,myninthparty,Makeadialogue:talkaboutthebirthdays,Betty-2JanuaryDavid-30SeptemberCindy-16JuneAlan-3MarchJay-22MaySam-12OctoberA:WhenisBettysbirthday?B:ItisonthesecondofJanuary/Januarythesecond.A:IsBettysbirthdayonthethetwelfthofJanuary?B:No.ItsonthesecondofJanuary.,B.Instructionaboutnumbers,3+99-33*99/3,Add3and9Subtract3from9Multiply3by9Divide9by3,3plus9equals/is12.9minus3equals/is6.3multipliedby9equals/is27.9dividedby3equals/is3.,3+9=129-3=63*9=279/3=3,add,substract,multiply和divide都是动词。plusandminus都是介词,addand,subtractfrom,Readtheinstructionsaloud.,B.Instructionaboutnumbers,1.S1:Add11and1.S2:11plus1equals/is12.(11+1=12),2.S1:S_5_13S2:_m_equals/is_.()3.S1:M_7_8.S2:_m_by_equals/is_.(),ubtract,from,13,inus,5,8,13-5+8,ultiply,by,7,ultiplied,8,56,7*8=56,4.S1:D_16_4.S2:_d_by_equals/is_.()5.S1:A_9_6.S2:_p_equals/is_