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Unit4WhenisEaster?BLet’slearnsecondfirstfourthJune4thFebruary2ndfifthAugust1stthird3rdJanuary3rdJuly5th4th1st2nd5thFlashgameWhenisthe_____________?It’son__________________.表示数目顺序的词叫序数词。例如:第一，第二，……firstsecondthirdfourth第二第三第四第一fifth(ve变f)第五sixthseventheighth（-t）第六第七第八ninth(-e)第九tenth第十特殊变化的：第一，第二，第三全都变，第五，ve变f替；第八，少t，第九，少e),其他的序数词要在基数词后面+th数字11121314基数词序数词eleventwelvethirteenfourteeneleventhtwelfththirteenthfourteenth1516171819fifteenthsixteenthseventeentheighteenthnineteenthsixteenseventeeneighteennineteenfifteen在11-19的序数词里面，只有第十二的变化最为特殊，twelfth1)在第1到第19之间：特殊变化的：第一，第二，第三，第五，第八，第九,第十二2）其他的序数词要在基数词后面+th数字20304050基数词twentythirtyfortyfifty数字60708090基数词sixtyseventyeightyninety整十的序数词的构成方法:是将词尾的字母y,变成ieth;例如：twenty----twentieth基数词twentythirtyfortyfifty序数词twentieththirtiethfortiethfiftieth基数词sixtyseventyeightyninety序数词sixtiethseventietheightiethninetieth几十几（例如32，68等）序数词变化方法：只是把个位数变成相应的序数词,十位数不变例如：21:53:66:twenty-onetwenty-firstfifty-threefifty-thirdsixty-sixsixty-sixth第一，第二，第三全都变，one–first,two--second,three—third,其它都是th结尾，八少t，第九少e，ve变f替；整十词尾字母y变ieth。Whenis___________________?It’son____________________Newyear’sDayFebruary1stAprilFool’sDayApril1stChildren’sDayJune1stChina’sNationalDayOctober1stMayDayMay1stWhenisTreePlantingDay?It’sonMarch12th.WhenisChristmas?It’sonDecember25th.Whenisyourbirthday?It’sonAugust21st.twenty-first21sttwenty-oneWhenisgrandpa’sbirthday?It’sonOctober12th.12thtwelfthtwelveWhenisgrandma’sbirthday?It’sonApril20th.twentieth20thtwentyWhenisDad’sbirthday?It’sonNovember30th.thirtieth30ththirtyWhenisMum’sbirthday?It’sonFebruary23rd.twenty-third23rdtwenty-threetwenty-thirdtwelfthtwenty-firstthirtiethtwentiethtwenty-thirdtwelfthtwenty-firstthirtiethtwentieth23rd12th21st30th20thWuyifan’sbirthdayisonAugust21st.Grandpa’sbirthdayisonOctober12th.Grandma’sbirthdayisonApril20th.Dad’sbirthdayisonNovember30th.Mum’sbirthdayisonFebruary23rd.Whenisyourbirthday?Mybirthdayison_______Mybirthdayison…/It’son…1、背诵变序数词的相关规则。2、背诵、抄写P42的句子，每个句子两遍。