2023学年完整公开课版Unit4Whatwouldyoudo虚拟语气

Unit4Whatwouldyoudo?

语法要点归纳1.虚拟语气

表示说话人认为所说的话是与事实相反的内容，只是一种愿望、假设、猜测、建议或空想，用于条件句或某些动词之后。在这样的句子中要用虚拟语气。2.虚拟语气的结构虚拟语气常用在由if引导的非真实条件从句中，是用谓语动词的特殊形式来表示与现在、过去事实相反的情况或对将来发生的情况表示怀疑。（1）表示与现在事实相反的情况IfIwereyou,Iwouldhelpher.如果我是你，我会帮助她。Iftherewerenoairorwater,therewouldbenolivingthingsontheearth.如果没有空气和水，地球上就不会存在生物。Ifhestudiedharder,hemightpasstheexam.如果他学习再努力一点儿的话，他可能会通过考试。从句谓语动词形式主句谓语动词形式过去（be用were）Should/would/could/might+动词原形(2)表示与过去事实相反的情况

IfIhadvisitedtheplacebefore,Iwouldhaveknowntheway.如果以前我过去那个地方，我就认识路了。Ifwehadleftearlier,wewouldn’thavemissedthetrain.假如我们早点儿动身的话，我们是不会错过火车的。Ifhehadtakenmyadvice,hewouldnothavemadesuchamistake.如果他听了我的劝告的话，就不会犯这样的错误了。从句谓语动词形式主句谓语动词形式had+过去分词should/would/could/mighthave+过去分词(3)表示对将来情况的主观推测（可能相反或可能性很小）

Ifyoushouldbelatetomorrow,wewouldnotwaitforyou.万一你明天迟到了，我们就不等你了。Ifheshouldseeme,hewouldknowwe.假如他看见我，就会认识我。Ifitweretosnowinsummer,Iwouldbelieveyou.倘若夏天下雪，我就会相信你。IftherewereaheavysnownextSunday,wewouldnotgoskating.如果下周日下大雪，我们就不能去滑冰了。从句谓语动词形式主句谓语动词形式①过去式②should+动词原形③过去将来时④wereto+动词原形would/should/could/might+动词原形3.虚拟语气用在wish后的宾语从句中(1)表示与现在事实相反的愿望，谓语动词用过去式。IwishIhadyourbrains.我希望我能有你那样的头脑（事实：我根本比不上你）（2）表示与过去事实相反的愿望，谓语动词用“had+过去分词”。IwishIhadknownthetruthofthematter.我希望我原来知道这件事的真相。（事实：我原来根本不知道）（3）表示将来难以实现的愿望，谓语动词用should/could/would/might+动词原形”。IwishIshouldhaveachanceagain.我真希望再有一次机会（事实：很难再有这样的机会）语法专题练习一、单项选择()1.Ifhe___you,he___me.A.was;wouldhelpB.is;willhelpC.were;wouldhelpD.were;helped()2.What___youdoifyourlittlesoncuthimselfbyaccident?A.willB.shallC.wouldD.must()3.Ifyourfather____this,hewouldbeangry.A.KnowsB.knewC.hadknownD.wouldknow()4.IfI____you,I____dothisexerciseinadifferentway.A.am;willB.be;wouldC.were;wouldD.willbe;would()5.IfIwere