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1、数词复习数词基数词序数词数量顺序基数词序数词基数词序数词onetwelvetwotwentythreetwenty-onefourfortyfiveonehundredsixonehundredandfiveeightonehundredandtwenty-nineninenineteen一.基数词、序数词firstsecondthirdfourthfifthsixtheighthninthtwelfthtwentiethtwenty-firstfortiethonehundredthonehundredandfifthonehundredandtwenty-ninthnineteent
2、h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—fifty80---eighty60---sixty70---seventy90—ninety4）21－99，两位数，十位与个位之间有“－”。21twe
3、nty—one55fifty—five99ninety—nine5）101—999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three29,43150076,,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fourthousandthreehundredandtwenty-onesevenmillion,sixhundreda
4、ndfiftyfourthousandthreehundredandtwenty-one7,654,3211,987,654,32143214,321onebillionninehundredandeighty-sevenmillion,sixhundredandfifty-fourthousandthreehundredandtwenty-one序数词的构成1)1－3,first,second,third。2)4－19,相应基数词+th,特殊拼写:fifth,eighth,ninth,twelfth。3)20－90,y变成ie+th,如twentieth。4)21－99,只把个位的基数
5、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)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(
6、数千),millionsof(数百万)+名词复数,可以用many/several修饰，但不能与具体数目连用。1.hundredthousand(表示具体数字)millionbillion2.hundredsthousands(表示概数)millionsbillions数词(several)++ofsome/manyhundredsof1)Ourcountryhasapopulationof1,300millionpeople.2)Therearethreethousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecameho
7、meless.4)Several/Manythousandsoftreesmustbeplantedeveryyear.1.—Ifa=3,b=4,what’stheanswertotheproblem,a+2ab+1=?—theansweris___.A.twentyeightB.twenty-eighthC.twenty-eight2.Inourschoolseveral__studentsareabletosearchtheIn
