FlashӰƬInChina,rubbish,suchasusedplasticbagsandboxesInChina,rubbish,suchasusedplasticbagsandboxesknownas“whitepollution”isbecomingaseriousproblem.knownas“whitepollution”isbecomingaseriousproblem.ManylakesandriversarepollutedbythewastefromManylakesandriversarepollutedbythewastefromfactories.Asthewealthofthecountryincreases,morefactories.Asthewealthofthecountryincreases,morewastewillbeproduced.wastewillbeproduced.Ifeveryoneinthecountryweretobuyonesoft-drinkcanIfeveryoneinthecountryweretobuyonesoft-drinkcaneachdayandthrowitaway,thewholecountrywouldsooneachdayandthrowitaway,thewholecountrywouldsoonbecoveredwithrubbish.becoveredwithrubbish.•Whatcanbeinferredfromthelastsentenceoftheparagraphabove?Ifeveryoneweretobuyonesoft-drinkcaneachdayandthrowitaway,thewholecountrywouldsoonbecoveredwithrubbish.与将来事实相反与将来事实相反::从句从句主句主句If+主语+weretodosthshoulddosthdidsth主语+would/couldshould/mightdosthManyyearslater,IwassailingtoEuropeonaManyyearslater,IwassailingtoEuropeonafinesailingshipacrosstheAtlantic.ForthegreaterfinesailingshipacrosstheAtlantic.Forthegreaterpartofthevoyagewehadpleasantweather,butpartofthevoyagewehadpleasantweather,buttowardstheendofourcrossingaterriblestormblewtowardstheendofourcrossingaterriblestormblewupandtheshipwouldhavesunkwithallonboardupandtheshipwouldhavesunkwithallonboardifithadnotbeenfortheeffortsofthecaptain.ifithadnotbeenfortheeffortsofthecaptain.•Whatwouldhavehappenedifthecaptainhadnotbeenonboard?theshipwouldhavesunkwithallonboardifithadnotbeen与过去事实相反与过去事实相反::从句从句主句主句If+主语+主语+would/couldshould/mighthavedonesthhaddonesth一：含IF条件句的虚拟语气If条件句主句pastnowfuturehad+donewould/could/might/should+havedonedid/werewould/could/might/should+dodid/wereshoulddowereto+do1.如果你早来5分钟，你就赶上这趟车了。Ifyou_______herefiveminutesearlier，you_______________thebus.2.如果我现在不忙，我就来帮你了。IfI____notbusy,I_________younow.3.如果明天下雪了，我们怎么办？What_____wedoifit__________tomorrow?hadgotwerewouldhelpshouldweretosnowWouldhavecaughtIfI____________busylastnight,I_____________toseethefilmwithyou.hadnotbeenwouldhavegoneIfhemorecarefully,hethecaraccidentyesterday.wouldnothavehadhaddrivenIfhe__________________(notreceive)theinfectedbloodtransfusionthatday,hadnotreceivedhe(notinfect)withAIDS.couldnothavebeeninfectedIfI___________(know)yourtelephonenumber,I_________________________(telephone)youyesterday..hadknownwouldhavetelephoned省略if,“用were,had,should+”主语.例如:WereIinschoolagain,Iwouldworkharder.Hadyoubeenhereearlier,youwouldhaveseenhim.Shouldtherebeameetingtomorrow,Iwouldcome.但在虚拟条件状语从句中,省略连词的倒装形式的句首不能用动词的缩略形式,如我们可以说:Wereitnotfortheexpense,IwouldgotoItaly.但不能说Weren’titfortheexpense,IwouldgotoItaly.二：虚拟语气特殊型：1.Wish的宾语从句现在：过去：未来：过去时（were）过去完成时would/could/might+V.should1.IwishIwereabird.（现在）2.IwishIhadn’tmadesuchamistake.（过去）3.Wewishourparentswouldn’tpunishus.（将来）2.asif/though+Clause现在：过去：过去时过去完成时Shelovesthebabyasifitwereherownson.Irememberthewholethingasifithadhappenedyesterday.后接虚拟语气，表示不可能或不真实的事或情形。3.Wouldratherthat现在：过去：未来：Iwouldratheryoupaidmenow.Iwouldratheryouhadgone,too.Don’tcome.Iwouldratheryoucametomorrow.过去时过去时过去完成时4.It’s(about...
