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1、数词复习数词基数词序数词数量顺序一.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--
2、-seventy90—ninety4）21－99，两位数，十位与个位之间有“－”。21twenty—one55fifty—five99ninety—nine二.基数词的读法1、百位和十位间用and连接,十位和个位间用—连接threehundredandtwenty-one3211018402、右往左数,三位一组,逗号隔开.依次是thousand(千)million(百万)billion(十亿)onehundredandoneeighthundredandfortyfourthousandthreehundredandtwenty
3、-onesevenmillion,sixhundredandfiftyfourthousandthreehundredandtwenty-one7,654,3211,987,654,32143214,321onebillionninehundredandeighty-sevenmillion,sixhundredandfifty-fourthousandthreehundredandtwenty-one1.hundredthousand(表示具体数字)millionbillion2.hundredsthousands(表示概数)
4、millionsbillions三.基数词的用法具体数目++ofsome/many/severalhundredsof3、another+基数词+名=基数词+more+名例：--Doyouhaveenoughstudentstocarrytheboxes?---No,Ithinkweneed——students.A.anotherB.threeothersC.morethreeD.threemore1.—Ifa=3,b=4,what’stheanswertotheproblem,a+2ab+1=?—theansweris___.
5、A.twentyeightB.twenty-eighthC.twenty-eight2.Inourschoolseveral__studentsareabletosearchtheInternet.A.hunderdofB.hunderdsofC.hundred3.Many__sheepwerekilledintheaccident.A.thousandsofB.thousandC.thousands4.Thereareovernine__workersinthefactory,but__ofyoungpeoplehopetow
6、orkinit.A.hundred;hundredsB.hundreds;hundredsC.hundreds;hundred四.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,（整十旳数）y变成ie+th,如twentieth。4)21－99,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，
7、结尾母t,d,d(first,second,third)，加th从4起，八少“t”，九去“e”，(eighth,ninth)“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。五.序数词构成规律(1)序数词作定语，前面要加the；Thefirsttruckiscarryingafoodbasket．Johnlivesonthefifteenthfloor．Sheismyfir
8、stEnglishteacher.(2)有时加a/an，“再一”，“又一”的意思We‘llhavetodoitasecondtime．ShallIaskhimathirdtime？WhenIsatdown，afourthmanrosetospeak．Theyha
