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1、表示次序的数词叫序数词，是由表示次序的数词叫序数词，是由基数词变化而来的。基数词变化而来的。1 one-first2 two-second3 three-third4 其余的序数词是由基数词后其余的序数词是由基数词后加加-th 变化而来。变化而来。几个特殊变化的序数词几个特殊变化的序数词1 five-fifth2 twelve-twelfth3 eight-eighth4 nine-ninth 整十的序数词把 y 变成 i加-eth1 twenty-twentieth2 thirty-thirtieth3 forty-fortieth4 fifty-fiftieth5 你能写出 sixty s
2、eventy eighty ninety 的序数词吗？你对了吗？你对了吗？1.Sixty-sixtieth2.seventy-seventieth3.eighty-eightieth4,ninety-ninetieth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 21st2.thirty-two 32-thirty-second 32nd3.ninety-nine 99-ninety-ninth 99th4.请写出请写出66 83 48 55的序数词。的序数词。日期的表达日期的表达 dateWhats the date today?Its March 28th.（1879.3.14-1955.4.)EinsteinEinsteinHis birthday isMarch 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 1st.When is Christmas Day?Its Dec.25th