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1、（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 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
2、sixty seventy eighty ninety 的序数词吗？,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,基数词 序数词 序数词缩写 one first 1st two second 2nd three thi
3、rd 3rd four fourth 4th six sixth 6th five fifth 5th twelve twelfth 12th eight eighth 8th nine ninth 9th twenty twentieth 20th thirty thirtieth 30th,基数词变序数词的特点,第一、二、三变单词。,一般是在基数词的末尾加th.,有的序数词是把基数词末尾ve 改为f再加th。,有的序数词是把基数词一个字母去掉再加th。,有的序数词是把基数词末尾 ty改为tie再加th。,8,(人教PEP)五年级英语下册Unit3(2)序数词,基数词变序数词顺口溜,二 三变
4、单词, th从四上起. 怎么加？真好记! 八减t，九减e f要把ve替，ty变为tie。,9,(人教PEP)五年级英语下册Unit3(2)序数词,When is your birthday?,Its _ .,日期的表达 date,Whats the date today? Its April 10th.,Wang Guoqing,When is Wang Guoqings birthday?,Whats the date?,12,(人教PEP)五年级英语下册Unit3(2)序数词,When is Childrens Day?Its June 1st.,When is Teachers Day?,Its Sept.10th.,August,15,(人教PEP)五年级英语下册Unit3(2)序数词,十.一 国庆节,October,16,(人教PEP)五年级英语下册Unit3(2)序数词,Christmas Day,December 25th,17,(人教PEP)五年级英语下册Unit3(2)序数词,（ 1879.3.14-1955.4.),Einstein,His birthday is March 14th.,Lu Xun His birthday is Sept.25th,(1881.9.25-1936.10.19),Goodbye！,