高中英语语法虚拟语气讲解ppt课件.ppt

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1、变电站电气主接线是指变电站的变压器、输电线路怎样与电力系统相连接，从而完成输配电任务。变电站的主接线是电力系统接线组成中一个重要组成部分语气语气英语的动词一般可带有三种不同的语气：英语的动词一般可带有三种不同的语气：陈述语气，祈使语气和虚拟语气。不同陈述语气，祈使语气和虚拟语气。不同的语气用动词的不同形式（有的还借助的语气用动词的不同形式（有的还借助句法形式）来表示。句法形式）来表示。变电站电气主接线是指变电站的变压器、输电线路怎样与电力系统相连接，从而完成输配电任务。变电站的主接线是电力系统接线组成中一个重要组成部分虚拟语气虚拟语气虚拟语气虚拟语气是一种特殊的动词形式，一是用来是一种特殊的动

2、词形式，一是用来表示说话人所说的话不是一个事实，而是一表示说话人所说的话不是一个事实，而是一种假设、猜测、怀疑等种假设、猜测、怀疑等(在在条件条件从句中或从句中或让步让步状语从句中状语从句中)；一是表示说话人的愿望、要求、；一是表示说话人的愿望、要求、命令、建议等命令、建议等 (在宾语从句、表语从句、同位在宾语从句、表语从句、同位语从句语从句)。虚拟语气的概念虚拟语气的概念 一、一、虚拟语气在条件句中虚拟语气在条件句中虚拟条件句虚拟条件句主句主句与与现在现在事实事实相反的假设相反的假设与与过去过去相反相反的假设的假设与与将来将来相反相反的假设的假设If+主语主语+动词的过去式动词的过去式（动词

3、（动词be用用were)主语主语+should,would,might,could动词动词原形原形If+主语主语+had +过去分词过去分词主语主语should, would, might, couldhave doneIf+主语主语+动词过去式动词过去式If+主语主语+were to+ 动词原形动词原形If+主语主语+should +动词原形动词原形主语主语should, would might, could动词动词原形原形eg:If I had time, I would attend the meeting. If he had hurried ,he could have caught

4、 the train. If I were to go abroad ,I would go to America.如果我是你，我就会努力学习如果我是你，我就会努力学习如果我知道他的电话号码，我就给他打电话了如果我知道他的电话号码，我就给他打电话了如果明天下雨的话，我们会取消比赛如果明天下雨的话，我们会取消比赛If I were you, I would work harder at my lessons.If I had known his telephone number, I would have called him.If it should were to rain, we woul

5、d call off the match.More practice:使用虚拟条件句要注意的几点：使用虚拟条件句要注意的几点：当条件状语从句表示的行为和主句表示的行为所当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，被称为：发生的时间不一致时，被称为：错综时间条件句错综时间条件句“，动词的形式要根据它所表示的时间作出相应的调整动词的形式要根据它所表示的时间作出相应的调整If you _(follow)my advice , you _(be)better now.如果你听我的建议，你现在就会痊愈了如果你听我的建议，你现在就会痊愈了had followedwould beIf yo

6、u had studied hard before, you would be a college student now.如果你努力学习的话，你现在就会是大学生了如果你努力学习的话，你现在就会是大学生了省略句省略句 在条件句中，可在条件句中，可省略省略 if，把，把were ,had, should 提到句首，变为倒装句式提到句首，变为倒装句式If I were at school again, I would study harder.Were I at school again, I would study harder.If you had come earlier, you woul

7、d have met him.Had you come earlier, you would have met him.If it should rain tomorrow, we would not go climbing.Should it rain tomorrow, we would not go climbing. 二、虚拟语气在名词从句中的运用二、虚拟语气在名词从句中的运用 、wish 后面的宾语从句中。后面的宾语从句中。 一般用虚拟语气，表示一种不可能实现的愿望。一般用虚拟语气，表示一种不可能实现的愿望。其谓语其谓语动词形式为：动词形式为：表现在过去时表现在过去时表过去过去完成时

8、表过去过去完成时表将来表将来would, might, could动词原形动词原形I wish (that) I were a bird.I wish (that) I had seen the film last night.I wish (that) I wouldcould go.2. If only （要是该有多好啊（要是该有多好啊)表示现在表示现在的情况的情况,应用过去式应用过去式; 如果是过去的情况如果是过去的情况,应用过应用过去完成时态去完成时态 *if only 通常独立使用，没有主句。通常独立使用，没有主句。 If only I knew the answer!If only

9、 I had seen the film yesterday!If only she would go with me! 3. as if ( as though) 看起来看起来常用虚拟形式，即常用虚拟形式，即表示与现在事实相反，用过去式；表示与现在事实相反，用过去式；与过去事实相反用过去完成式与过去事实相反用过去完成式 (had done).He treats /treated the boy as if he were his own son.He speaks/ spoke as if he had known about it4. would rather + 从句动词用从句动词用过去

10、式过去式或或过去完成时过去完成时I would rather you told me the truth.I would rather you had gone there last Sunday.I would rather you came tomorrow. 1. It is (high / about ) time that从句从句中的谓语动词用过去式或中的谓语动词用过去式或should动词动词原形，原形，should不能省略不能省略It is high time that you went / should go to school.2. If only （要是该有多好啊（要是该有多

11、好啊)表示现在表示现在的情况的情况,应用过去式应用过去式; 如果是过去的情况如果是过去的情况,应用过应用过去完成时态去完成时态 *if only 通常独立使用，没有主句。通常独立使用，没有主句。 If only I knew the answer!If only I had seen the film yesterday!If only she would go with me! 2. 2.用于表示命令、建议、要求等一类词后面的宾语从句。用于表示命令、建议、要求等一类词后面的宾语从句。insist, order, command, suggest, advise, propose, requi

12、re, request, demand, desire etc.We suggested that the meeting (should) be put off.They insisted that the boy (should) go with them.注意：注意：suggest 当表示当表示“暗示、表明暗示、表明“讲时，讲时，insist 表示表示”坚持认为坚持认为“之意时，应用陈述语气。之意时，应用陈述语气。The smile on his face suggested that he was satisfied with our work.The man insisted tha

13、t he had never stolen the money.他脸上的表情表明他对我们的工作很满意他脸上的表情表明他对我们的工作很满意那个人坚持说他没有偷钱那个人坚持说他没有偷钱 在在suggestion / proposal / order / plan / advice / idea / request 等等名词后的表语和同位语从句中名词后的表语和同位语从句中要用要用“should动词原形动词原形”should可以省略可以省略（2）用于表语从句和同位语从句）用于表语从句和同位语从句My idea is that we (should ) think it over before acce

14、pting it. My suggestion that we (should) have a meeting has been accepted by others.We all agree to that suggestion that the meeting (should) be put off.A.在句型在句型 “It is important (necessary, strange, natural) that . ” 中，中，that 后面的从句中的谓语动词后面的从句中的谓语动词用：用： should + 动词原形动词原形 我们有必要出去散散步。我们有必要出去散散步。 Its n

15、ecessary that we should have a walk now. 2 她这样做是很自然的。她这样做是很自然的。 Its natural that she should do so. 3 重要的是我们要照顾好病人。重要的是我们要照顾好病人。 Its important that we should take good care of the patient. （3）虚拟语气在）虚拟语气在 在主语从句中在主语从句中B. 在在It is demanded/suggested/ordered/required.that-clause句型中句型中从句用从句用(should )+动词原型动

16、词原型It is demanded that we should work out a plan.C. 在在 It is a pity/a shame/ no wonder that.句型中句型中从从句也常用句也常用(should )+动词原型动词原型 Its a pity that you (should) miss a good chance. 1. It is (high / about ) time that从句中的谓从句中的谓语动词用过去式或语动词用过去式或should动词原形，动词原形，should不能省略不能省略三、虚拟语气在其他从句中三、虚拟语气在其他从句中It is high

17、 time that you went / should go to school.2. If only 引导的感叹句（要是该有多好啊引导的感叹句（要是该有多好啊)表示现在的情况表示现在的情况,应用过去式应用过去式; 如果是过去的情况如果是过去的情况,应用过去完成时态应用过去完成时态 If only I knew the answer!If only I had seen the film yesterday!3. would rather + 从句动词用过去式或过去完成时从句动词用过去式或过去完成时I would rather you told me the truth.I would ra

18、ther you had gone there last Sunday. 4. as if ( as though) 看起来看起来常用虚拟形式，即常用虚拟形式，即表示与现在事实相反，用过去式；与过去事实相反表示与现在事实相反，用过去式；与过去事实相反用过去完成式用过去完成式 (had done).He treats /treated the boy as if he were his own son.He speaks/ spoke as if he had known about it5. even if ( even though)即使即使Even if he were here, he

19、could not solve the problem.Even if I had been busy then, I would have helped you.四四 情态动词情态动词+ have donecould have done 本来可以本来可以- - -might have done 本来可能本来可能 - - -should / ought to have done 本来应该做本来应该做 - - -shouldnt / ought not to have done 本不该做本不该做 - - 你本不应该告诉她真相。你本不应该告诉她真相。You shouldnt have told h

20、er the truth .neednt have done 本不必做本不必做 - - - 比较：比较：didnt need to do 没必要做也没有做没必要做也没有做 - - - 我没必要擦窗户。我兄弟做了我没必要擦窗户。我兄弟做了I didnt need to clean the windows . My brother did it.would have done 本来会去做本来会去做-我没有足够的钱否则我会买那本书的我没有足够的钱否则我会买那本书的I didnt have enough money, otherwise I would have bought that book.变电

21、站电气主接线是指变电站的变压器、输电线路怎样与电力系统相连接，从而完成输配电任务。变电站的主接线是电力系统接线组成中一个重要组成部分Choose the best answer: It is strange that the little boy _ speak two foreign languages. A. could b. can C. should D. would 2. He gave orders that the experiment _ before 5:30pm. A. be finished B.will finish C. must be finished 3.He _

22、 you more help,even though he was very busy. A, might have given B. might give C.may have given 4.Without the leadership of the Party,there _no New China.1. A.would be B. has been C. should be D.wasCAAA变电站电气主接线是指变电站的变压器、输电线路怎样与电力系统相连接，从而完成输配电任务。变电站的主接线是电力系统接线组成中一个重要组成部分5. He is talking so much about

23、 America as if he _ there. had been B. has been C. was D. has gone6. The young man insisted that he _ nothing wrong and _ free.A. did; set B. had done; should be set C. should do; be set D. had done; must be set7. Had you listened to the doctor, you _ all right now. are B. were C. would be D. would have been8. You _ come earlier. The bus left a moment ago. A. would B. should have C. may D. have BBcA