人教版(2019)必修第二册Unit3InternetDiscoveringUsefulStructure
Learningobjectives:Afterlearningthisclass,you’reableto...1.learntheformofPresentperfectpassivevoice.2.knowhowtousePresentperfectpassivevoiceinaspecificsituation.3.WriteablogtodiscusstheadvantagesanddisadvantagesofInternet.
BYYUSHENTalkaboutsomethingthathasbeendoneReadthepairsofsentences.Underlineandcomparethedifferentverbforms.Jan’slifehasbeengreatlyimprovedbytheInternet.MuchhasbeenwrittenaboutthewondersoftheWorldWideWeb.TheInternethasgreatlyimprovedJan’slife.PeoplehavewrittenmuchaboutthewondersoftheWorldWideWeb.
BYYUSHEN现在完成时activepassiveThestudentshavecleanedtheclassroom.Theclassroomhasbeencleaned.Youneedn’tcleanitnow.present(now)futurepast表示说话时已经完成的被动性的动作或结果，主语是动作的承受者。
BYYUSHENHowdoweformthepresentperfectpassivevoice?Fillintheblank.have/hasbeen+v-ed主动语态变被动语态的原则“三变”原句主语by的宾语宾语主语谓语由主动被动“三不变”原句意思不变原句时态不变原句主谓宾以外成分不变Talkaboutsomethingthathasbeendone
BYYUSHEN现在完成时的被动语态结构形式肯定形式：Hishomeworkhasbeenfinished.否定形式：Hishomeworkhasnotbeenfinished.一般疑问句:Hashishomeworkbeenfinishedyet?特殊疑问句：Howlonghashishomeworkbeenfinished?主语+have/hasbeendone...主语+have/hasnotbeendone...have/has+主语+beendone...?疑问词+have/has+主语+beendone...?
BYYUSHEN现在完成时的被动语态的用法Theletter(post)already.Manyhouses(build)forthepoorsofar.hasbeenpostedhavebeenbuilt用法1:强调过去的动作对现在造成的影响或结果，主语和谓语之间为被动关系，通常与already,yet,just,never,recently等副词连用Activity1
BYYUSHENThemachine(repair)fortwohoursbutitstilldoesn’twork.Papermoney(use)forover50years.用法2:表示一个被动的动作或状态开始于过去，持续到现在，并可能持续下去，常与for或since引导的时间状语连用，或用于“Howlong...?”句型中。hasbeenrepairedhasbeenused
BYYUSHENYoushouldn’tleaveschoo