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1、 Unit6 How long have you been collecting shells?Section BI am still teaching English now.How long have you been teaching English?I have been teaching English for five years.since 2001*He started teaching math when he was 20 years old.He is 50 years old now and he is still teaching math.How long has
2、he been teaching math?He has been teaching math 30 years ago.for 30 years.since he was 20 years old.How long have you been doing?Ive been doingforsince2 hoursHow long has she beenreading?She has been reading for2 hours.She has been reading since2 hours ago.half an hourHow long has he been playing co
3、mputer games?He has been playing computer gamesfor half an hour.since half an hour ago.45 minutesHow long have they been playing soccer?They have been playing soccerfor 45 minutes.since 45 minutes ago.an hourHow long have they been swimming?They have been swimmingfor an hour.since an hour ago.15 min
4、utesHow long has he been drawing a picture?He has been drawing a picture for 15 minutes.since 15 minutes ago.PAIRWORKA:What does Bob collect?B:He collects kites.A:How long has he been collecting kites?B:Hes been collecting kites since he was ten years old.ten years old.(The Present Perfect Progressi
5、ve Tense)表示动作从过去某一时间开始，一直延续到现在，可能还要延续下去。常和表示一段时间的状语连用。They have been working for two hours.他们已工作两小时了。for 和表示一段时间的词组连用They have been running since six oclock.从6点起他们一直在跑。since 和表示过去某一时刻的词或词组连用I have been waiting for you since I came here.自到这儿以来我一直在等你。since 后可跟句子，句子时态多用一般过去时Homework:1.Finish 3b2.Interview your classmates and make some dialogues according to 4a.