Howlonghavebeencollectingshells?Didyousleepwelllastnight?Whendidyoustartclasstoday?IstartedteachingEnglishin2008.Howlonghasshebeenreading?anhourPairworkSkatingMarathon1bListeningQuestionsName当我们谈论动作从过去某一时间开始一直延续到现在,并且有可能持续下去时，我们常常用以下句型来表示:for+一段时间have/hasbeen+doingsth+since+过去的时间点since+从句(一般过去时)一般过去时表示在过去某个时间发生的动作或存在的状态,该动作已结束,不强调同现在的关系;Exercises1.Howlong_____you___________(collect)shells?Forhalfayear.2.Howlong____he_________(skate)?Sincehe_______(be)tenyearsold.3.When____he____(start)learningtodance?In2002.4.We______________(run)ontheplaygroundsince6o’clocka.m.用for和since填空HomeworkReporter:Alison,howlonghaveyoubeenskating?Alison:I’vebeenskatingforfivehours.Reporter:Wow!Sam,howlongdidyouskate?Sam:Iskatedforfourhours.Istartedatnineo’clockinthemorningandstoppedatoneo’clockintheafternoon.I’mverytired!Reporter:Whendidyoustartskating,Victor?Victor:Atnineo’clock.Reporter:Soyou’vebeenskatingfor…Victor:I’vebeenskatingforfivehours.Reporter:Howlongdidyouskate,Celia?Celia:Umm,let’ssee…Iskatedfortwohours.