A Let‘s learn

Unit4Thenandnow,PartALetslearn,Youcanreadbooksinit.Whatisit?,Itsa_.,library,Youoftendrawspicturesinit.,Itsan_.,artroom,（T:Whatsthis?Whoseschool?Whatstheschoollike?）,Whereisit?,grass,Whereisit?,gym,Whereisit?,dininghall,Whatcanwedointhedininghall?,havelunch,gym,Iplayedping-ponginthegymthreedaysago.,三天前threedaysago,一天前,onedayago,五天前,fivedaysago,两年前,twoyearsago,四个月前,fourmonthsago,一年前,oneyearago,还有哪些表示过去的时间？,lastweekend,lastnight,yesterday,thedaybeforeyesterday,lastyear去年,lastmonth上个月,oneyearago,twoyearsago,threedaysago,gym,grass,dininghall,fourmonthsago,motel,单词竞赛（2分钟速记）,onemonthago,lastyear,lastmonth,goldeneyes,lastmonth,threemonthsago,twoyearsago,gym,grass,dininghall,onedayago,motel,Whatarethedifferences?,twentyyearsago,now,Wasthereagymintheschool？,No,itwasnt.,Isthereagymintheschool？,Yes,itis.,Whatarethedifferences?,Therewasnogymintheschooltwentyyearsago.,Nowthereisanewoneintheschool.,Attention:注意使用therebe句型,Now,10minutesago,Thereisonlyonehorseonthegrassnow.,Thereweremanyhorsesonthegrass10minutesago.,Now,1hourago,Thereisnopeopleinthegymnow.,Thereweremanypeopleinthegym1hourago.,Now,3daysago,ThereisaTVinthedininghallnow.,TherewasnoTVinthedininghall3daysago.,Summary（现在地方有）Thereis_(+可数名词单数或不可数）_now.are_（+可数名词复数）_（过去地方有）Therewas_(+可数名词单数或不可数）_ago.were_（+可数名词复数）_,Forexample:,Therewas/wereno_intheschooltwentyyearsago.,Nowthereis/are_intheschool.,Attention:注意使用therebe句型,twentyyearsago,now,Letssay,Findthemistakes,therewerenogyms,peopledidntgobybus,peoplecouldntusetheInternet,mistakes,buildings（建筑）gymdininghallpostofficecoffeeshopmotelcinematrafficlight（红绿灯）streetlight（路灯）,traffic（交通）gobybusgobybike,activities(活动)watchTVusethephoneusetheInternet,Atthattime，therewerenogyms.Peopledidntgobybus.PeoplecouldntusetheInternet.,Pairwork,Discusswithyourgroup.Findoutthemi