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1、表示次序的数词叫序数词，是表示次序的数词叫序数词，是由基数词变化而来的。由基数词变化而来的。1 one -first2 two-second3 three-third4 其余的序数词是由基数词其余的序数词是由基数词后加后加-th 变化而来。变化而来。4-19的序数词一般由“基数词+th”构成four-fourthsix-sixthten-tenthnineteen-nineteenth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 整十的序数词把整十的序数词把 y 变成变成 i加加-eth1
2、twenty-twentieth2 thirty-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几十几的序数词，十位数不变，几十几的序数词，十位数不变，个位数变成序数词。个位数变成序数词。1. twenty-one 21-twenty-first 21st2.thirty-two 32-thirty-second
3、 32nd3.ninety-nine 99-ninety-ninth 99th4 .请写出请写出66 83 48 55的序数的序数词。词。 sixty-sixth eighty-third forty-eighth fifty-fifth基变序有规律基变序有规律,结尾加上结尾加上th；一二三特殊记，结尾各是一二三特殊记，结尾各是t，d，d；八减八减t九去九去e，f来把来把ve替；替；y改为改为ie,结尾仍有结尾仍有th；若是遇到几十几，只变个位就可以。若是遇到几十几，只变个位就可以。序数词的简写形式：序数词的简写形式：阿拉伯数字阿拉伯数字+序数词最后两个字母序数词最后两个字母first-1st
4、 second-2ndThird-3rd fourth-4thfifth-5th twelfth-12thtwentieth-20th thirty-first-31st用序数词表示具体的日期用序数词表示具体的日期Whats the date today?Its March 28th.（ 1879.3.14-1955.4.)EinsteinEinsteinHis birthday ison March 14th.Lu Xun. His birthday is on Sept.25th(1881.9.25-1936.10.19)When is your birthday?Its on _ .When is Teachers Day?Its on Sept.10th.When is Childrens Day?Its on June 1st.When is Christmas Day?Its onDec.25th.
