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1、虚拟语气在从句中的用法与练习类别用法例句if引导的条件从句与现在事实相反从句动词：过去式（be用were）；主句动词：should/would/could/might+动词原形Ifhewerehere,hewouldhelpus.与过去事实相反从句动词：had+过去分词；主句动词：should/would/could/might+have+过去分词IfIhadbeenfree,Iwouldhavevisitedyou.与将来事实相反从句动词：过去式/should+动词原形/were+不定式；主句动词:should/would/could/might+动词原形Ifitsho
2、uldraintomorrow,wewouldnotgocamping.其他状语从句asif引导的状语从句中动词用过去式或过去完成式Theyaretalkingasiftheyhadbeenfriendsforyears.evenif/though引导的从句,与现在将来/事实相反:从句动词用过去式,主句动词用should/would+动词原形。与过去事实相反:从句动词：had+过去分词；主句动词：should/would+have+过去分词Eveniftheyweretofail,theywouldn’tlosecourage.宾语从句demand,suggest,ord
3、er,insist等表命令、建议、要求后的从句中动词（should）+动词原形Hesuggestedthatwenotchangeourmind.wish后的从句中分别用过去式、过去完成式和could/would+动词原形表示与现在、过去和将来情况相反IwishIcouldbeapopsinger.主语从句在Itisnecessary/important/strangethat…,Itissuggested/demanded/ordered/requestedthat…等从句中，谓语动词用（should）+动词原形Itisstrangethatsuchapersonsho
4、uldbeourfriends.表语从句和同位语从句作idea,advice,order,demand,request等表命令、建议、要求的词的表语从句和同位语从句，其谓语动词用（should）+动词原形Myadviceisthatyou(should)finishyourhomeworkfirst.Theideathatyou(should)goisright.其他句型中Itistimethat…句型中动词用过去式或should+动词原形It’shightimethatweleft.wouldrather所接的从句中动词用过去式或者过去完成式Iwouldratheryo
5、ustayedathomenow.Ifonly句型中动词常用过去式或者过去完成式，表示强烈的愿望Ifonlyourdreamhadcometrue!二其他要注意的事项1.虚拟语气中出现be的过去式，只能用were。2.suggest表“暗示、表明”和insist表示“坚持认为”,其后的宾语从句用陈述句语气。例如：Youpalefacesuggeststhatyouareill./Heinsistedthathewasright.3.if虚拟语气条件句中如有had,should,were，可省略if,将其提前引起倒装。例如：WereIyou,Iwouldremain./Ha
6、dyoutoldmeearlier,Iwouldn’thavemissedit.4.可用with,butfor代替虚拟语气条件句。例如：Butforyourhelp.Iwouldhavefailedtheexam.Withoutairtherewouldbenolife.asif/though,evenif/though也可以不用虚拟，表示真实的情况。例如：Itlooksasifitisgoingtorain.II、实战演练用所给动词的适当形式填空---Ifhe________________(warn),he________________(nottake)thatfo
7、od.---Luckilyhewassenttothehospitalimmediately.Whenapencilispartlyinaglassofwater,itlooksasifit_________________(break).Iwouldratherthey_________________(nothear)ofthenews.IwishI_______________(have)aroomofmyownwhenIwasachild.Tothesurpriseofthepublic,theidentificati
