unit3-grammar现在完成时的被动语态

ThePresentPerfectPassiveVoiceUnit3computers1.

Presentperfecttense

(现在完成时)Let'sreview!e.g.我已经成为一个高中生。

Structure：have/has+V过去分词Let'sreview!2.Thepassivevoice

(被动)e.g.晚会在星期二举行Structure:be+V过去分词bedone

+

have/hasdone

Passivevoice+PresentperfecttenseDefinition:Anactionwhichispassivelyfinishedbynow.(到现在为止已经完成的某个被动的动作)e.g.Applehasbeenupgradedalot

overthetime.have/hasbeendoneThepresentperfectpassivevoice?1.Thesubjectisnottheperformeroftheaction,butthebearer.2.

Theactionisfinishedbythetimeoftalking.3.

Theactionstartedinthepast,anditlastuntilnow.Itmaylastlongertothefuturetime.pastpresent......

〔future〕e.g.Theapplehasbeeneaten!1.Phraseswhichcontainprepositionscan'tleftouttheprepositions.介词词组不可把介词省去Hehasthoughtofawayofsolvingtheproblem.2.

Intransitiveverbsdon'thavethepassivevoice,suchastakeplace,arrive,become,disappear,etc.不定式没有被动态Theaccidentwhichwashappenedyesterdaysurprisedme.

Payattentiontotheseparticularcases:=Awayofsolvingtheproblemhasbeenthoughtof.1.Whenwe'llgetanotherholiday____yet.A.arenotdecidedB.havenotbeendecidedC.isnotbeingdecidedD.hasnotbeendecided2.Betty___injuredsincelastSaturday.

A.hasbeenB.was

C.isD.hasLet'spractice!Let’ssummarize！IhaveYouhaveHe/She/IthasWehaveYou/Theyhave

(not)beentold….HaveIHaveyouHashe/she/itHaveweHaveyou/they〔not〕beentold…?Ininterrogativesentences:Inaffirmative/negativesentences:THANKYO