课件21张PPT。 When is the art show? Part B Let's learn & Ask and write Unit 4RevisionAsk and answerLet's read1st2nd3rd4th5thLet's learn点击图片，播放视频或点击此处播放视频Yang Mi is an actress. When is her birthday? It's on September 12th.简写：12thtwelfth基数词：twelvetwelfth基数词变序数词口诀：“基”变“序”有规律，ve要用f替，再加th.How old is Lu han? When is his birthday? It's on April 20th.twentiethtwentieth简写：20th基数词：twenty基数词变序数词口诀：“基”变“序”有规律，整十先把词尾y改为ie,再加th.Is she an actress? When is her birthday? It's on January 30th.thirtieth简写：30th thirtieth基数词：thirty基数词变序数词口诀：“基”变“序”有规律，整十先把词尾y改为ie,再加th.Wang Junkai is a singer. How old is he? When is his birthday? It's on September 21st.twenty-firsttwenty- first简写：21st 基数词：twenty-one基数词变序数词口诀：“基”变“序”有规律，表示“第几十几”，只变个位就可以。Sun Yanzi is a pop singer. She's from Singapore. When is her birthday? 23rdtwenty-thirdIt's on July 23rd.twenty-third简写：23rdtwenty- third基数词：twenty-three基数词变序数词口诀：“基”变“序”有规律，表示“第几十几”，只变个位就可以。Sum-upLook and write Practice Group workMake a survey.调查组内成员的生日，看哪一组同一月过生日的人数多，则获胜。 Exercise 我会排排序1._____ 2._____ 3._____ 4._____ 5._____ twelfthtwentiethtwenty-firsttwenty-thirdthirtiethSummary（听、说、认读、写）词汇： twelfth (12th) twentieth (20th) twenty-first (21st) twenty-third (23rd) thirtieth (30th)
