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1、Unit2Grammarandusage2现在分词功能定语表语宾语补足语状语Revision1.Seeingtheteacherenteringtheroom,thestudentsstoodup.2.Beingastudent,hewasinterestedinsports.3.Havingwrittentheletter,Johnwenttothepostoffice.状语现在分词作状语时，注意如下三点：相当于相应的从句分词的逻辑主语就是全句的主语现在分词作状语时有不同的时态与语态Rewritesentences1.Becausehe
2、knewthattherewasadogoutside,thelittleboydidn’topenthedoor.=________thattherewasadogoutside,thelittleboydidn’topenthedoor.（原因）Knowing2.Thecouplewentshopping.Asaresult,theylefttheireldestdaughteraloneathome.=Thecouplewentshopping,________theireldestdaughteraloneathome.(结果）l
3、eaving3.Timepermitting,Iwillmeetyouforlunch.=Iftimepermits,Iwillmeetyouforlunch.（条件）4.Askingaround,Ifindmanypeoplewillingtopayslighthigherpricesforthingsthatareenvironmentallyfriendly.=whenIaskaround,Ifindmanypeoplewillingtopayslighthigherpricesforthingsthatareenvironment
4、allyfriendly.（时间）Hetraveledontheplanelikethis,keepingthetortoisehiddeninablanket.(keeping的逻辑主语和句子的主语一致，都是he)_______throughthepark,beautifulflowerscouldbeseeneverywhere.WalkingB.WhenIwalkedC.WalkD.WalkedWhenworkinginthefactory,hewasanadvancedworker.=Whenheworkedinthefactor
5、y,hewasanadvancedworker.注意：1.-ing短语与when，while，though，until，if等连词连用时，相当于这些连词引导的一个从句。如：Thoughwillingtoattendtheparty,herefusedtheinvitation.=Thoughhewaswillingtoattendtheparty,herefusedtheinvitation.WhilestayinginBeijing,hecametoseemetwice.=WhilehewasstayinginBeijing,hecam
6、etoseemetwice.Ifplayingallday,youwillwasteyourvaluabletime.=Ifyouplayallday,youwillwasteyourvaluabletime.Thoughrainingheavily,itclearedupverysoon.=Thoughitwasrainingheavily,itclearedupverysoon.2.动词-ing形式在句中作状语时，其逻辑主语与主句的主语保持一致。如：Hetraveledontheplanelikethis,keepingthetort
7、oisehiddeninablanket.=Whenhetraveledontheplanelikethis,hekeptthetortoisehiddeninablanket.主动被动一般writingbeingwritten完成havingwrittenhavingbeenwritten时态和语态1.Hehurriedhome,lookingbehindashewent.（一般式）2.Havingfinishedtheirwork,theyhadarest.（完成式）3.Thelargebuildingbeingbuiltisalib
8、rary.（被动语态）4.Havingbeenshownthelab,weweretakentoseethelibrary.（被动完成式）完成主动式1.Havingfinishedherhom
