英语人教版五年级下册Unit4 B Let’s learn.ppt

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1、Unit4WhenisEaster?BLet’slearnHowmanyballscanyousee?twelfth第十二（的）12thtwelfthtwelveWhenisGrandpa’sbirthday?It'sonOctober12th.把ve变成f再加thtwentieth第二十（的）20thtwentiethtwentyWhenisGrandma’sbirthday?It'sonApril20th.把y变成ie再加ththirtieth第三十（的）30ththirtieththirtyWhenisDad’sbirthday?

2、It'sonNovember30th.把y变成ie再加thtwenty-third第二十三（的）23rdtwenty-thirdtwenty-threeWhenisMum’sbirthday?It'sonFebruary23rd.几十几只变个位数twenty-first第二十一（的）21sttwenty-firsttwenty-oneWhenisyourbirthday?It'sonAugust21st.几十几只变个位数sayquicklytwelfthtwentiethtwenty-thirdthirtiethtwenty-first

3、Let'ssummarytwenty-twotwenty-second基变序，有规律：一般都是在基数词的末尾加上th发音

4、θ

5、特殊情况：1，一、二、三、特殊记，八去t,九去e,ve要用f替，最后th加上去.2，整十去y变ie,然后再加th.3，若是遇到几十几，只变个位就可以。基数词：1，2，3……序数词：第一，第二，第三……twentytwentieth20ththirtythirtieth30th第一、二、三特殊记一般是在基数词的末尾加th基数词末尾ve要用f替，再加th八去t，九去e，再加th整十基数变序数，末尾y改为ie，再加th

6、基数词序数词序数词缩写onefirst1sttwosecond2ndthreethird3rdfourfourth4thsevenseventh7thfivefifth5thtwelvetwelfth12theighteighth8thnineninth9thWhat’smissing12th20thtwenty-third21sttwelfthtwenty-first22nd30thtwenty-thirdOctober24thSept.21stJuly12thJune23rdLookandwriteWhenisyourbirthda

7、y?Mybirthdayison….寻找与你同年同月同日生的有缘人Let‘spractice一、写出下列单词的完全形式(1)12th(2)20th(3)30th(4)21st(5)23rd(1)twelfth(2)twentieth(3)thirtieth(4)twenty-first(5)twenty-third1.is,when,birthday,your,brother’s(?)2.uncle’s,my,in,is,July,birthday(.)3.is,December12th,on,birthday,ZhangPeng’s(

8、.)Whenisyourbrother’sbirthday?Myuncle’sbirthdayisinJuly.ZhangPeng’sbirthdayisonDecember12th.二、Putthewordinrightorder.(连词成句)Homework1.抄写42页Let’slearn的单词五遍.2.预习41页Let’stalk.Thankyou