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1、序数词,序数词,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 five-fifth 2 twelve-twelfth 3 eight-eighth 4 nine-ninth,整十的序数词把 y 变成 i加-eth,1 twenty-twentieth 2 thirty-thirtieth 3 forty-fortieth 4 fifty -fiftieth 5 你能写出 sixty seventy eighty ninety 的序数词吗？
2、,你对了吗？,1. Sixty-sixtieth 2. seventy-seventieth 3.eighty-eightieth 4,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 21st 2.thirty-two 32-thirty-second 32nd 3.ninety-nine 99-ninety-ninth 99th 4 .请写出66 83 48 55的序数词。,日期的表达 date,Whats the date today? Its March 28th.,（ 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 1st.,When is Christmas Day?,Its Dec.25th,
