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1、数词Numerals2warmingup1._______tresswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2．______ofthestudentsaregirlsinourclass．A．Twothree B．TwothreesC．Twothirds D．Secondthree3.----Whenwasheborn?----Hewasbornon________.A.secondofOctoberB.theOctoberthreeC.Oct
2、oberthesecondD.threeofOctober3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。什么叫数词?4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--
3、-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-three529,43150076,,thousandhundredmillionbillionand6)1，000以上数目,从右向左每三位用“，”
4、分开,分别读为thousand,million,billion基数词的构成基数词的构成6500431729sixbillion,fivehundredmillion,fourhundredandthirty-onethousandsevenhundredandtwenty-ninefourthousandthreehundredandtwenty-onesevenmillion,sixhundredandfiftyfourthousandthreehundredandtwenty-one7,654,3211,987,654,32143214,321onebillion,ninehu
5、ndredandeighty-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),t
6、housandsof(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.Inourschoo
7、laboutfive__studentsareabletosurftheInternet.A.hunderdofB.hunderdsofC.hundred3.__sheepwerekilledintheaccident.A.ThousandofB.ThousandC.Thousandsof4.Thereareovernine__workersinthefactory,but__ofyoungpeoplehopetoworkinit.A.hundred0f;hundre
