新人教版高中英语必修二Unit3TheInternet

DiscoveringUsefulStructures

Learningobjectives:Afterlearningthisclass,you’reableto...1.learntheformofPresentperfectpassivevoice.2.knowhowtousePresentperfectpassivevoiceinaspecificsituation.3.WriteablogtodiscusstheadvantagesanddisadvantagesofInternet.

TomcatchesJerry.JerryiscaughtbyTom.一个内容两种说法从动作发出者角度从动作承受者角度主动说法被动说法主动语态被动语态选择哪一种呢？关键看强调的对象和角度

被动语态的几个概念TomcatchesJerry.JerryiscaughtbyTom.动作的发出者动作动作的承受者被动语态的句子中由______引出动作的发出者。byby有“通过，被”的意思

被动语态的基本形式观察下列被动语态的句子，圈出表示被动含义的谓语部分。Thetreesareplantedbythevolunteers.Disneylandisenjoyedbymillionsofpeoplefromallovertheworld.Thewastewaterispouredintotheriverbythechemicalfactory.被动语态的基本形式:be+p.p.（动词的过去分词）

主动语态如何转换成被动语态？

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(b