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Topic3Whatclassareyouin?SectionBUnit1MakingNewFriendsA:Hello,IamKangkang.What’syourname?B:MynameisLily.A:Howoldareyou?B:Iamthirteen.A:Whatclassareyouin?B:IaminClassThree,GradeSeven.A:Who’sthat?B:That’sMaria.Let’sreview.ThisisaCD.ThisisaTV.What’sthisinEnglish?It’sapencil.anappleWhat’sthisinEnglish?It’s…aneraserabookamapa和an的区别1.a用在以辅音音素开头的单词前。例如：abook，adesk2.an用在以元音音素开头的单词前。例如：anegg，anapplea/an被称作不定冠词，用在单数可数名词前，表达某一个人或事物中的一个，相当于汉语的“一”，但不强调数目概念。a/an用法的区别：acarapencilapenabookamapanappleanappleanorangeanegganeraserapplerulerpencildeskaaaaneraseranA:What’sthisinEnglish?B:It’saneraser.A:Howdoyouspellit?B:E-R-A-S-E-R,eraser.Let’ssaytogether.SectionBLook,listenandsay.Excuseme,what’sthisinEnglish?It’saneraser.（视频P19-1a）mapdeskpenpencileraserA:What’sthisinEnglish?B:It’sapen.A:Howdoyouspellit?B:P-E-N,pen.A:Thankyou.B:That’sOK.A:What’sthatinEnglish?B:It’satoy.A:Canyouspellit,please?B:Yes.T-O-Y,toy.A:Thanks.B:You’rewelcome.bookHowdoyouspellit?What’sthatinEnglish?It’s________.B-O-O-K,_______.abookA:What’sthisinEnglish?B:It’sA:Howdoyouspellit?B:apen.P-E-N,pen.apencil-box.P-E-N-C-I-L-B-O-X,pencil-box.abook.B-O-O-K,book.aneraser.E-R-A-S-E-R,eraser.aruler.R-U-L-E-R,ruler.Listenandcompletetheconversations.A:Excuseme,what’s____inEnglish?B:It’s_____pencil.A:Howdoyouspellit?B:P-E-N-C-I-L,______.A:Thankyou.B:______________.apencilYou’rewelcomethis(录音P19-1b)A:Excuseme,what’s____inEnglish?B:It’s_____apple.A:_______________?B:Yes,A-P-P-L-E,apple.A:________.B:That’sOK.anCanyouspellitThanksthatWhat’sthis/thatinEnglish?It’sa/an…Howdoyouspellit?/Canyouspellit?…PracticeListenandcompletetheconversationwiththecorrectwords.Thenpracticewithyourpartner.Isthatatoy,too?Aneraser?Wow!No,it’san_______.No,itisn’t.It’sa____.Isthisa_________?（视频P20-2a）telephonetoyeraserThatisatoy.Isthatatoy?Thisisaneraser.Isthisaneraser?be动词的位置发生了变化。句型也由陈述句变成了一般疑问句。A:Isthisaneraser?B:Yes,_____.A:Thankyou.A:Isthatapen?B:No,_______.Itisapencil.itisitisn’tA:Isthatadesk?B:Yes,itis.A:Isthisanorange?B:No,itisn’t.It’sanapple.A:IsheTomCruise?B:A:B:No,heisn’t.HeisfromAmerica.Yes,heis.IshefromEngland?A:What’sthisinEnglish?B:Isita/an…?Example:What’sthisinEnglish?Isita/an…?Yes,itis.Howdoyouspellit?/No,itisn’t.Pleasetryagain.Touchandguesswhatitiswitheyescovered.Usesentencesofidentifyingobjects.Sumup1.Patterns:What’sthis/thatinEnglish?It’sa/an…Howdoyouspellit?/Canyouspellit?Isthis/thata/an…?Yes,itis./No,itisn’t.2.Newwords:a/an,spell,can,please（1）总结：在学过的名词中，哪些前面加a，哪些前面加an。（2）参考1a/2a，自编两则对话。