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1、Unit4LearningefficientlyGrammar课件1.IfIwereAndyLou,IwouldbeinHongKongnow.2.IwishIwereamillionaire.3.WesuggestthateveryoneshouldhelptheAIDSpatients.WhentousetheSubjunctiveMoodinEnglish?hypotheseswishessuggestion虚拟语气TheSubjunctiveMood虚拟语气是一种特殊的动词形式(verbstructure),用来表示说话人所说的话不是一个事实(fact)，而只是一种假设
2、(hypotheses)愿望(wishes)、建议(suggestion)或怀疑(doubt)等等。ThedefinitionoftheSubjunctiveMood1.虚拟语气在条件句中1)“表示不太可能出现的情况”,条件从句一般用过去时,主句用woulddo,shoulddo或might/coulddo;虚拟语气应该注意的几点:2)表示“本可能发生却未发生的事情”,条件从句用过去完成时,主句用wouldhavedone,shouldhavedone,might/couldhavedone.Theoldmenwouldfinditdifficulttogetajobifthe
3、yleftthefarm.Ishouldbesurprisedifitwaslessthanfivepounds.IfIfrightenedthosebirds,theymightflyoffandIwouldneverseethemagain.IfIwereyou,Iwouldaccepttheoffer.IfIwereaskedtodefinemymood,I’dsay“bored”.Ifhehadtakenhisdoctor’sadvice,hemightnothavediedsosoon.Ifhehadrealizedthat,hewouldhaverunawaywhi
4、letherewasstilltime.Ifshehadnotmarried,shecouldhavebecomespecialinthefiled.2.虚拟语气在条件句也可用来表示“将来不太可能出现的情况”,条件从句用shoulddo,weretodo或一般过去时,主句用woulddo,shoulddo,could/mightdo.Ifitshouldraintomorrow,thesportsmeetwouldhavetobeputoff.IcouldseethesurfaceofthemoonwithmyowneyesifIweretogotothemoonsomeday
5、.Whatwouldyoudoifhefailedtocometomorrow?注意:含有should的条件句,主句可以用一般现在时或一般将来时.例如:Ifthereshouldbeanotherflood,whatshallwedo?Askhertoleaveamessageifsheshouldcome.3.在正式英语文体中,if从句中的第一个动词如果是should,were或had,可将此动词置于句首,替代if．例如：Wereitalltrue,itwouldstillnotexcusetheiractions.Hadthecaptainbeenmorecareful,h
6、isshipwouldnothavesunk.Shouldanyvisitorscome,Iwouldsayyouarenothere.4.ifonly和suppose(supposing),也可以引导虚拟从句．IfonlyIhadmoretime,Icouldgotheretohelpthem.Supposingitwerefinetomorrow,wouldyougoclimbingthemountainwithus?5.Ifitwerenot/hadnotbeenfor…也是常见的虚拟句型,意思是“要不是……”例如:Ifithadnotbeenforyourhelp,we
7、wouldnothaveachievedsomuchinourwork.Ifitwerenotforthewisedecision,wecouldnotbelivingahappylife.6.虚拟语气用于Iwish…的宾语从句中:表示现在时间,动词用一般过去时和过去进行时(be动词用were/was)。表示过去时间,动词用过去完成时和过去完成进行时。表示将来时间,动词用would/could等+动词原形。IwishIknewhowtooperatethiscomputer.Iwishhew
