中考英语数词复习PPT课件VIP免费

数词Numeralswarmingup1._______tresswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2．______ofthestudentsaregirlsinourclass．A．TwothreeB．TwothreesC．TwothirdsD．Secondthree3.----Whenwasheborn?----Hewasbornon________.A.secondofOctoberB.theOctoberthreeC.OctoberthesecondD.threeofOctober2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。3基数词的构成1）1－12,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13--19,由3－9+teen构成。14–fourteen16--sixteen17--seventeen19—nineteen特殊拼写:13–thirteen15--fifteen18—eighteen3）20－90,以-ty结尾。20—twenty30---thirty40—forty50—fifty60---sixty70---seventy80---eighty90—ninety4）21－99，两位数，十位与个位之间有“－”。21twenty—one55fifty—five99ninety—nine5）101—999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three429,43150076,,thousandhundredmillionbillionand6)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5基数词的构成6500431729sixbillion,fivehundredmillion,fourhundredandthirty-onethousandsevenhundredandtwenty-ninefourthousandthreehundredandtwenty-onesevenmillion,sixhundredandfiftyfourthousandthreehundredandtwenty-one7,654,3211,987,654,32143214,321onebillion,ninehundredandeighty-sevenmillion,sixhundredandfifty-fourthousandthreehundredandtwenty-one1.hundredthousand(表示具体数字)millionbillion2.hundredsthousands(表示概数)millionsbillions三.基数词的用法三.基数词的用法数词(several)++ofthe/some/many/these/thosehundredsof基数词的用法1、表示具体数目,hundred,thousand,million不用复数表示不确定数目,用复数。即hundredsof(数百),thousandsof(数千),millionsof(数百万)+名词复数。1)Ourcountryhasapopulationof1,300millionpeople.2)Thereareseveralthousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless.1.—Ifa=3,b=4,what’stheanswertotheproblem,a+2ab+1=?—theansweris___.A.twentyeightB.twenty-eighthC.twenty-eight2.Inourschoolaboutfive__studentsareabletosurftheInternet.A.hunderdofB.hunderdsofC.hundred3.__sheepwerekilledintheaccident.A.ThousandofB.ThousandC.Thousandsof4.Thereareovernine__workersinthefactory,but__ofyoungpeoplehopetoworkinit.A.hundred0f;hundredsB.hundred;hundredsC.hundreds;hundred5.peopleintheworldaresendinginformationbye-maileveryday.A.SeveralmillionB.ManymillionsC.SeveralmillionsD.ManymillionA序数词的构成1)1－3,first,second,third。2)4－19,相应基数词+th,fourth,fifth,sixth,seventh,eighth,ninth,tenth,eleventh,twelfth,thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth.3)20－90,y变成ie+th,twentieth,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth。4)21－99,只把个位的基数词变成序数词如twenty-first,ninety-ninth5)序数词缩写----数字＋最后两字母如1st,2nd,3rd,4th…基变序,有规律,词尾加上“th”，一、二、三，特殊记，结尾字母t,d,d八去“t”，九去“e”，“f”要把ve替见“y”变成“i”和“e”，词尾加上“th”，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)14基数词序数词基数词序数词onetwelvetwotwentythreetwenty-onefourfortyfiveonehundredsixonehundredandfiveeightonehundredandtwenty-nineninenineteen一.基数词、序数词一.基数词、序数词firstsecondthirdfourthfifthsixtheighthninthtwelfthtwentiethtwenty-firstfortiethonehundredthonehundredandfifthone...