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Copyright 2004-2009,版权所有 盗版必究,（人教PEP）五年级英语下册课件,Unit 3 My birthday,序数词学习,表示次序的数词叫序数词，是由基数词变化而来的。,1 one-,first,2 two-,second,3 three-,third,4,其余的序数词是由基数词后加,-,th,变化而来。,几个特殊变化的序数词,1 fi,ve,-fi,f,th,2 twel,ve,-twel,f,th,3 eight-eight,h,4 nin,e,-nin,th,整十的,序数词,把,y,变成,i,加,-eth,1 twent,y,-twent,i,eth,2 thirt,y,-thirt,i,eth,3 fort,y,-fort,i,eth,4 fift,y,-fift,i,eth,5,你能写出,sixty seventy eighty ninety,的序数词吗？,你,对了吗？,1.Sixty-sixti,eth,2.,seventy-seventi,eth,3.eighty-eighti,eth,4,ninety-nineti,eth,几十几的序数词，十位数不变，个位数变成序数词。,1.twenty-,one,21-twenty-,first,21,st,2.thirty-,two,32-thirty-,second,32,nd,3.ninety-,nine,99-ninety-,ninth,99,th,4.,请写出,66 83 48 55,的序数词。,日期的表达,date,Whats the date today?,Its,March 28,th,.,（,1879.3.14-1955.4.),Einstein,His,birthday is,March 14th,.,Lu,Xun,His birthday is,Sept.25th,(1881.9.25-1936.10.19),When is your birthday?,Its _.,When is Teachers Day?,Its,Sept.10th.,When is Childrens Day?Its,June 1,st,.,When is Christmas Day?,Its,Dec.25th,Goodbye！,
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