If引导的虚拟语气课件.ppt

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1、If引导的条件句、虚拟语气,if引导的条件句,If she invites me tomorrow,I will go to the party.请把这句话与下面虚拟语气的带条件从句的主从复合句进行比较：If she invited me,I would go to the party.假如她邀请我参加聚会，我就去。If she had invited me yesterday,I would have gone to the party.假如她昨天邀请我参加聚会，我就去了。If she should invite me tomorrow,I would go to the part如果她明天

2、邀请我参加聚会，我会去的。,后退一步法是指在准确地判断了该句与哪一事实相反后，if引导的非真实条件状语从句中，谓语动词按正常情况“后退一步”。也就是：与过去事实相反，在从句中用过去完成时形式表示与现在事实相反，在从句中用过去一般时形式表示 与将来事实可能相反，在从句中用过去将来时形式表示 主句中则用情态动词would,should,could 等加动词形式,退后一步法,1.对现在的虚拟,一、if引导的虚拟语气的三种情况,If the people were better educated,I believe this could solve the problem.If they had pr

3、oper education in schools,they would know how to control their lives.,2.对过去的虚拟,If they had ended their meeting without further action,Amercia would have been very different.If they had not campagined for financial independence,women may not have had control over their own money.,与将来事实相反的假设,1.If the

4、lecture should be late,you should have to make a speech first.2.If the lecture were late tomorrow,you would have to make a speech first.,虚拟语气中省略if：在书面语中，如果从句的谓语中有were,had 或should,就可以省略if,并将were,had 或should 放到句首。当然，如果从句没有were,had,或should,就不能省略if.,二、虚拟语气中if的省略,If I were to do it,Id do it some other wa

5、y.Were I to do it,Id do it some other way.If you should fail,try again.Should you fail,try again.If you had been here earlier,you would have seen him.Had you been here earlier,you would have seen him.I would have bought the house If I had had enough money.I would have bought the house had I had enou

6、gh money.,Note：省略了if的倒装形式的句首不能用动词的缩略形式。Were it not for the expense,I would go to Italy.（）Werent it for the expense,I would go to Italy.（）,But for your help,I couldnt have done it.Without electricity human life would be quite different today.练习：请用介词短语代替条件状语从句1.要不是你的帮助，我就失败了。2.如果没有恰当的控制手段，核反应堆就会爆炸（核反应

7、堆 nuclear reactor）。,三、用介词短语代替条件状语从句,4.1 Wish/if only 的用法用在“wish+宾语从句”中，表示很难实现或不能实现的愿望，可以翻译为“但愿”,“悔不该”等。表示对现在的虚拟，从句的谓语动词用过去式（be动词用were）；表示对过去的假设，从句的谓语动词用“had+过去分词”表示对将来的愿望，从句的谓语动词用“would(could)+动词原形,四、虚拟语气的其他句型和用法,表示与现在事实不相符的假设事件 1.V-ed主语+wish/if only+that+2.were 3.would/could/should+VI wish that he

8、were my boyfriend.I wish that he cared for me.I wish that he could help me when I an in trouble.,表示与过去事实想法的假设主语+wish/if only+that+1.过去完成时 2.would/could/should+V+have doneI wish that he had been my boyfriend at that time.I wish that she could have helped me when I wan in trouble.,与将来事实相反 主语+wish/if o

9、nly+that+would/could/might+动词原形I wish you would agree with me.If only the rain would stop.I wish I could see the situation through his eyes.,注意：wish 与hope接宾语从句的区别在于：hope表示一般可以实现的希望，宾语从句用陈述语气。Wish表示很难或不大可能实现的愿望，宾语从句用虚拟语气。请比较：We hope we will succeed.(We dont know if we will succeed.)We wish we would s

10、ucceed.(We know we can hardly succeed.),4.2 as if/as though,even if/even though从句中的虚拟.如果指的是现在的状况，则用过去式(be用were)如果指过去发生的动作，则谓语动词用had过去分词形式如果指将来的事情，would(should,could)+动词原形She looks as if/though she were ill.看她的样子，好像生病了。He walks as if he were a king.他走起路来就好像他是国王。He acted as if nothing had happened.他表现

11、得若无其事。He would not resign even if the heaven should collapse.即使天塌下来，他也不会辞职。,4.3在It is(high)time(that)句型中后面的从句的谓语动词常用过去式(be的过去式用were)或用should+动词原形(should 不能省略)来表示。这句话的意思是“（现在）该”。For example:It is time we left/should leave.It is high time that you got married.It is time that I bought a car.,4.4 在 I wo

12、uld rather(that)句型中,“我宁可”Would rather+从句+与现在事实相反，则用过去式(be用were)Would rather+从句+与过去动作相反，则谓语动词用had过去分词形式For example:Id rather I were in the rain now.Id rather you did not tell him.I would rather she hadnt done that.,4.6 用在表示建议、要求、命令等意思的动词主语+谓语动词+should+动词原形，should 可以省略。这类的动词有：arrange/command/demand/de

13、sire/insist/order/propose/request/require/suggest/beg/move（提议）We suggested that we(should)have a meeting.We insisted that they(should)go with us.The doctor ordered that she(should)stay in bed for a few days.He demanded that we(should)start right away.The villagers requested that the old building not

14、 be pulled down.,Note：suggest 表示“暗示，表明”时，宾语从句不用虚拟语气。Insist后面强调的是事实时，宾语从句也不用虚拟语气。,Note:若上述表示建议、要求、命令等意思的动词用作名词时，名词之后的从句用虚拟语气，should 可以省略。如：He made a request that he(should)be allowed to take 3 days off.Our suggestion is that education not be industrialized.,Note:上述动词在It is suggested that,It is requir

15、ed that,Its requested that,Its ordered that,Its arranged that句型中，that 之后的从句用虚拟语气，should 可以省略，但引导词that 不能省略。如：It was suggested that he attend the conference.It was requested that the trial be openly reported.,4.7 用在表示建议、要求、命令等意思的形容词在Its important(imperative,necessary,essential,vital,desirable,advisab

16、le,better)that句型中，that 引导的从句用虚拟语气，should可以省略。这个句型表示说话人的意见、要求等。For example:It is essential that there should be enough food and clothing for the winter.It is desirable that your wedding be postponed until next July.It is imperative that the board chairman be present at the board meeting.,总结：在学习虚拟语气的时候要善于发现虚拟语气的规律。根据动词的变化，大致可以把虚拟语气分为三种：if,wish,suppose的情况，动词用过去式，过去分词式，或过去将来式表示建议、要求、命令等意思的动词或名词后面所接的从句，以及It is important(necessary)that后面所接的从句It is(high)time(that)和I would rather 后面的从句，动词用过去式或过去进行时,四、虚拟语气学习总结,