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1、12 months in a year表示次序表示次序(第几第几)的数词叫序数的数词叫序数词，是由基数词变化而来的。词，是由基数词变化而来的。1 one-first 1st2 two-second 2nd3 three-third 3rd4 120中的中的其余的序数词是其余的序数词是由基数词后加由基数词后加-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-fifth 5th2 twelve-twelfth 12th3 eight-eighth 8th4 nine-ninth 9th 整十的序数词把 y 变成 ie加-th1 twenty-twentieth2 t
2、hirty-thirtieth3 forty-fortieth4 fifty-fiftieth5 你能写出 sixty seventy eighty ninety 的序数词吗？你对了吗？你对了吗？1.Sixty-sixtieth2.seventy-seventieth3.eighty-eightieth4.ninety-ninetieth了解：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 99th日期的
3、表达日期的表达 dateWhats the date today?Its March 23rd.（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 National Day?Its Oct.1st.或Its October 1st.When is Womens Day?Its March 8th.When is Army Day?Its Aug.1st.或 Its August 1st.When is Childrens Day?Its June 1st.When is Teachers Day?Its Sept.10th.或 Its September 10th.When is New Years Day?Its Jan.1st.或Its January 1st.When is Christmas Day?Its Dec.25th 或或Its December 25th.