人教版必修二课件Unit 3 Computers learning about language

Unit3learningaboutlanguageComputers Discoveringusefulwordsandexpressionscompletechangeinwaysofthinking,working,etcconnectedcomputersystemtomakethingseasiertofindtheanswerusingnumberscanbemovedeasilyfromplacetoplacerevolutionnetworksimplitycaculatemobile completeexplorewebtechnologyartificialapplicationintelligentlogicallreality DiscoveringusefulstructuresAnewPChasbeenbought.Mycomputerhasbeenrepairedquickly.Mycomputerhasbeenattacked.Theproblemhasnotbeensolvedyet.Thecompany’scomputershavebeengivenaway.Akindofintelligentrobothasbeendeveloped. 现在完成时的被动语态表示动作发生在过去,到现在已经完成或对现在仍有影响,其构成是:have/hasbeen+done。Thedirtyclotheshavebeenwashed.脏衣服都已经洗了。Theplanhasbeenstudiedbytheexpertsforthreetimes.这项计划已经由专家研究过三次了。 现在完成时被动态：have/has +been+动词过去分词现在完成进行时：have/has+been+动词现在分词现在完成时被动态与现在完成进行时的比较： 它们的构成的区别在最后的动词上,被动态接的是过去分词形式,现在完成进行时接的是现在分词形式。TheTempleofZhangFeihasbeenrebuilt.张飞庙已经过重建。1.主语是行为动作的承受者。 Thedoorhasbeenlocked.门已经被锁上了。（我或别人现在进不去）2.说话时已经完成的动作或出现的结果。 Hehasbeentoldaboutitformanytimes.有人告诉他这事很多次了。（可能还会有人告诉他）3.动作或状态始于过去，持续到现在，并可能持续下去。 We’llstartassoonastheworkhasbeenfinished.工作一完成我们就立即动身。4.用在时间和条件状语从句中，表示将来某时已完成的动作。 often,usually,always,never,hardly,seldom等副词置于have/has和been中间。[误]Suchamanhasbeenhardlybelieved.[正]Suchamanhashardlybeenbelieved.注意：1.副词的位置 happen,takeplace,breakout,belongto,cost,last等不及物动词或词组无被动语态。[误]GreatchangeshavebeentakenplaceinChinasince1978.[正]GreatchangeshavetakenplaceinChinasince1978.2.并不是所有动词都有被动语态 2)open,break,drop等不强调动作发出者时常用主动语态。[误]Thedoorhasbeenopenedofitself.[正]Thedoorhasopenedofitself. TheSARSpatientshavebeentakengoodcareof.3.短语动词不可分割或省略其中的介词或副词 如borrow,finish,begin,buy,start,return,marry,open,join等构成的现在完成时的被动语态不能与表示一段时间的状语连用。若要表达相应的意思，则需改换动词或时态。4.一些特殊动词 Mybrotherhashad(不能用hasbought)thisbikeforalmostfouryears.Howlonghasthisbookbeenbought?Howlongagowasthisbookbought? 1.----Howlong____atthisjob?----Since1990.A.wereyouemployedB.haveyoubeenemployedC.hadyoubeenemployedD.willyoubeemployed 2. Whenandwheretogofortheon-salaryholiday____yet.A.arenotdecidedB.havenotbeendecidedC.isnotbeingdecidedD.hasnotbeendecided 3.–Hi,Tom,youlooktired.--Ofcourse.I___thelivingroomallday.A.hadpaintedB.paintedC.havebeenpaintedD.havebeenpainting 4.Millionsofpounds’worthofdamage___byastormwhichsweptacrossthenorthofEnglandlastnight.A.hasbeencausedB.hadbeencausedC.willbecausedD.willhavebeencause 5.Haveyouever___totheexhibitionwhich___forthreeweeks?A.gone;hasbeenshownB.visited;shownC.been;hasbeenonshowD.went;lasted Apersonalcomputerhasboughtbyus.2.Manyproblemshasbeenfoundwithournewcomputer.beenboughthave改错。 3.APChasbeenbuildedthewaywewanted.4.Ourcomputerjusthasbeenjoinedtotheinternet.builthasjust