上海洛基国际英语--------本科学、专科高级英语——重点语法剖析系列五Howtostayhealthy?Maintainahealthysenseofacceptanceinadvancevaccine.Makevivovaccinationwithinfectioussubstancestoproduceantibodies,whichprotectourbodyfrominvasionKeepgoodhabits.(1)Alwaysopenthewindow,keeptheindooraircirculation.(2)Wetrytoavoidgoingtocrowdedpublicplaces,inordertoavoidinfectionwithinfluenzavirus.Becausepeopleinmanyplaces,carryingbacteria,themore.3.含蓄虚拟条件句的谓语动词形式含蓄虚拟语气是指假设条件不通过if从句表达，而是暗含在其他结构中。考生应熟悉：(1)连词but,butthat,or,orelse；副词otherwise,unfortunately等表示转折假设。如：Asafetyanalysiswouldhaveidentifiedthetargetasapotentialdanger.Unfortunately,itwasneverdone.Victorobviouslydoesn’tknowwhat’shappened;otherwisehewouldn’thavemadesuchastupidremark.(2)介词短语暗含假设条件，常用的有：without,butfor,undermorefavorableconditions等。如：ButfortheEnglishexaminationIwouldhavegonetotheconcertlastSunday.(3)intended/meant/hoped/wished/planned或was/were+不定式完成式或hadintended/meant/planned/hoped/wished+不定式一般式暗示虚拟语气。如：Iintendedtohavecalledonyou,butIwasbusyatthattime.(4)情态动词完成式暗示虚拟语气。如：Ishouldhavecalledtomakeanairlinereservation,butIdidn’t.4.常用虚拟形式的句型(1)从句中动词用过去式或过去完成式表示虚拟的句型：wouldratherwouldassoonasthoughsuppose…hadratherwouldsoonerasifsupposing…Ifonly…Itis(high)timethat…(从句中动词只用过去式)如：Hiswifewouldrathertheydidn’ttalkaboutthematteranymore.I’dratheryouwentbytrain,becauseIcan’tbeartheideaofyourbeinginanairplaneinsuchbadweather.IfIwereinamovie,thenitwouldbeabouttimethatIburiedmyheadinmyhandsforacry.Myfatheralwaystalksasthoughhewereaddressingapublicmeeting.(2)Ifitwerenotfor…(与现在事实相反)Ifithadnotbeenfor…(与过去事实相反)相当于butfor。如：Ifithadnotbeenforhishelp(=butforhishelp),wewouldnothavesucceeded.(3)Ifonly…谓语动词视情况选用适当的形式。如：Ifonlythecommitteewouldapprovetheregulationsandputthemintoeffectassoonaspossible.(4)lest/forfearthat/incase从句谓语用(should+)动词原形。如：Themadmanwasputinthesoft-paddedcelllestheinjurehimself.(5)whether…or…有时谓语用be的原形，引导让步虚拟从句，这种用法经常采用倒装结构。如：Churchasweusethewordreferstoallreligiousinstitutions,betheyChristian,Islamic,Buddhist,Jewish,andsoo