unit 4 B let's learn.ppt

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1、Unit4WhenisEaster?Let’slearnLookandwriteWhenis_________________?It’son__________________.Newyear’sDayJanuary1stAprilFool’sDayApril1stChildren’sDayJune1stChina’sNationalDayOctober1stMayDayMay1st表示数目顺序的词叫序数词。例如:第一，第二，……序数词firstsecondthirdfourth第二第三第四第一fifth(ve变f)第五sixthseventheighth（-t

2、）第六第七第八ninth(-e)第九tenth第十WhenisTreePlantingDay?WhenisChristmas?Whenisyourbirthday?It’sonAugust21st.twenty-first21sttwenty-oneWhenisgrandpa’sbirthday?It’sonOctober12th.12thtwelfthtwelveWhenisgrandma’sbirthday?It’sonApril20th.twentieth20thtwentyWhenisDad’sbirthday?It’sonNovember30th.th

3、irtieth30ththirtyWhenisMum’sbirthday?It’sonFebruary23rd.twenty-third23rdtwenty-three数字20304050基数词整十的数twentythirtyfortyfifty数字60708090基数词sixtyseventyeightyninety序数词整十数的序数词的构成方法:是将整十数的词尾-y,变成i和e再加–th;例如：twenty----twentieth序数词几十几（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-o

4、netwenty-firstfifty-threefifty-thirdsixty-sixsixty-sixth基变序，有规律：一般词尾th;1、2、3特殊记，词尾各是t,d,d;8加h、9去e;ve要用f替;遇y变成i和e，th在后别忘记;若要表示几十几，只变各位就可以。数字11121314基数词序数词eleventwelvethirteenfourteeneleventhtwelfththirteenthfourteenth1516171819fifteenthsixteenthseventeentheighteenthnineteenthsixteense

5、venteeneighteennineteenfifteen在11-19的序数词里面，只有第十二的变化最为特殊，twelfth基数词twentythirtyfortyfifty序数词整十数变序数词twentieththirtiethfortiethfiftieth基数词sixtyseventyeightyninety序数词sixtiethseventietheightiethninetiethWuyifan’sbirthdayisonAugust21st.Grandpa’sbirthdayisonOctober12th.Grandma’sbirthdayison

6、April20th.Dad’sbirthdayisonNovember30th.Mum’sbirthdayisonFebruary23rd.Whenisyourbirthday?Mybirthdayison_______Whenisyour/yourfather’s/yourmother’sbirthday?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。Homework