十四节课串讲四六级语法第二讲ppt课件

1、虚拟语气 虚拟语气是一种特殊的动词方式，一是用来表示说话人所说的话不是一个现实，而是一种假设、猜测、疑心等(在条件从句中或退让状语从句中)；一是表示说话人的愿望、要求、命令、建议等 (在宾语从句、表语从句、同位语从句)。一、虚拟语气的概念 虚拟条件句虚拟条件句主句主句与与现在现在事实相事实相反的假反的假设设与与过去过去相反的相反的假设假设与与将来将来相反的相反的假设假设If+主语+动词的过去式动词be用were)主语+should,would,might,could动词原形If+主语+had +过去分词主语should, would, might, couldhave done1、If+主语+

2、动词过去式2、If+主语+were to+ 动词原形3、If+主语+should +动词原形主语should, would might, could动词原形二二 根本的三种情况根本的三种情况1、表示与如今现实相反的情况：、表示与如今现实相反的情况： 从句：从句：If 主语主语+过去时过去时(Be动词用动词用were) 主句：主语主句：主语+should/would/could/might+do eg： 1If I were you,I would take an umbrella. 2If I knew his telephone number,I would tell you. 3If th

3、ere were no air or water,there would be no living things on the earth2、表示与过去现实相反的情况、表示与过去现实相反的情况 从句：从句：If 主语主语+had+done 主句：主语主句：主语+should/would/could/might+have done eg： 1 If I had got there earlier, I should/could have met her. 2If he had taken my advice, he would not have made such a mistake. 3、表示

4、对未来情况的客观推测、表示对未来情况的客观推测 主句：主语主句：主语+should/could/would/might + do 从句：从句：if+主语主语+were to do if+主语主语+should/would/could/might + do if+主语主语+did动词过去式动词过去式/were e g： 1If he should come here tomorrow , I would talk to him. 2If there were a heavy snow next Sunday, we would not go skating. 3If she were to be

5、 here next Monday , I would tell her about the matter. 三、运用虚拟条件句要留意的几点：三、运用虚拟条件句要留意的几点：有时，虚拟条件句中，结果主句和条件从句的谓语动作有时，虚拟条件句中，结果主句和条件从句的谓语动作假设不是同时发生时，虚拟语气的方式应作相应的调整。这假设不是同时发生时，虚拟语气的方式应作相应的调整。这种条件句叫错综条件句。种条件句叫错综条件句。 从句的动作与过去现实相反，而主句的动作与如今或如从句的动作与过去现实相反，而主句的动作与如今或如今正在发生的现实不符。今正在发生的现实不符。 e g： If I had worke

6、d hard at school ,I would be an engineer ,too . If they had informed us , we would not come here now. 从句的动作与如今现实相反，而主句的动作与过去现从句的动作与如今现实相反，而主句的动作与过去现实不符。实不符。 如：如： If he were free today , we would have sent him to Beijing. 。 If he knew her , he would have greeted her. 2当虚拟条件句的谓语动词含有当虚拟条件句的谓语动词含有were ,

7、should ,had 时，时，if可以省略，这时条件从句要用倒装语序，即把可以省略，这时条件从句要用倒装语序，即把were ,should , had等词置于句首，这种多用于书面等词置于句首，这种多用于书面语。语。E g： Should he agree to go there , we would send him there. Were she here , she would agree with us. Had he learnt about computers , we would have hired him to work here.。 3、非真实条件句中的条件从句有时不表达出

8、来，只暗含、非真实条件句中的条件从句有时不表达出来，只暗含在副词、介词短语、上下文或其他方式表示出来，这种句子在副词、介词短语、上下文或其他方式表示出来，这种句子叫做含蓄条件句，在多数情况下，条件会暗含在短语中，如叫做含蓄条件句，在多数情况下，条件会暗含在短语中，如without，but for等等 E g： But for his help , we would be working now. Without your instruction , I would not have made such great progress. We didnt know his telephone nu

9、mber , otherwise we would have telephoned him. 4、 有时，虚拟条件句中，主、从句可以省略其中的一个，来表有时，虚拟条件句中，主、从句可以省略其中的一个，来表示说话人的一种剧烈的感情。示说话人的一种剧烈的感情。 省略从句省略从句 He would have finished it. 他本该完成了。他本该完成了。 You could have passed this exam. 他天性经过这次考试他天性经过这次考试的。的。 省略主句省略主句 If I were at home now. 要是我如今在家里该多好啊。要是我如今在家里该多好啊。 If on

10、ly I had got it. 要是只需我得到它了该多好啊。要是只需我得到它了该多好啊。 5留意，在虚拟语气的从句中，动词留意，在虚拟语气的从句中，动词be的过去时态一概用的过去时态一概用were，不用不用was。 eg：If I were you,I would go to look for him. 四、虚拟语气在名词从句中的运用四、虚拟语气在名词从句中的运用1 用于宾语从句用于宾语从句 、wish wish 后面的宾语从句中。后面的宾语从句中。 普通用虚拟语气，表示一种不能够实现的愿望。其谓普通用虚拟语气，表示一种不能够实现的愿望。其谓语动词方式为：语动词方式为：表如今过去时表如今过去

11、时表过去过去完成时表过去过去完成时表未来表未来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.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, require, request, demand, desire etc.We suggested

12、 that the meeting (should) be put off.They insisted that the boy (should) go with them.留意：留意：suggest 当表示当表示“暗示、阐明暗示、阐明“讲时，讲时，insist 表表示坚持说之意时，运用陈说语气，作示坚持说之意时，运用陈说语气，作“坚决主张；坚坚决主张；坚决要求讲时，用虚拟语气。如：决要求讲时，用虚拟语气。如： The smile on his face suggested that he was satisfied with our work.The man insisted that he

13、 had never stolen the money. 在在suggestion / proposal / order / plan / advice / idea / request 等名词后的表语和同位语从句中要用等名词后的表语和同位语从句中要用“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 accepting it. My suggestion that we (should) have a meeting has been

14、 accepted by others.We all agree to that suggestion that the meeting (should) be put off.3 虚拟语气在主语从句中A.在句型 “It is important (necessary, strange, natural) that . 中，that 后面的从句中的谓语动词用： should + 动词原形 1 Its necessary that we should have a walk now. 2 Its natural that she should do so. Its important that

15、we should take good care of the patient. B. 在在It is demanded/suggested/ordered/required.that-clause句型中从句用句型中从句用(should )+动词原型动词原型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

16、. 1. It is (high / about ) time that从句中的谓语动词用过去式或should动词原形，should不能省略五、虚拟语气在其他从句中五、虚拟语气在其他从句中It is high time that you went / should go to school.2. If only 引导的感慨句要是该有多好啊引导的感慨句要是该有多好啊)表示如今的情况表示如今的情况,运用过去式运用过去式; 假设是过去的情况假设是过去的情况,运用过去完成时态运用过去完成时态 If only I knew the answer!If only I had seen the film y

17、esterday!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 rather you had gone there last Sunday. 4. as if ( as though) 看起来常用虚拟方式，即看起来常用虚拟方式，即表示与如今现实相反，用过去式；与过去现实相反表示与如今现实相反，用过去式；与过去现实相反用过去完成式用过去完成式 (had done).He treats the boy as if he were his own son.He sp

18、oke as if he had known about it5. even if ( even though)即使即使Even if he were here, he 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 本来能够本来能够 - - -should / ought to have done 本来应该做本来应该做 - - -shouldnt

19、 / ought not to have done 本不该做本不该做 - - 他本不应该通知她真相。他本不应该通知她真相。You shouldnt have told her the truth .neednt have done 本不用做本不用做 - - - 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-I didnt have enough money, otherwise I would have bought that book.Choose the best answer:It is strange that the little boy _ _ speak two foreign languages. A. could b. can C. should D. would2. He gave orders that the experiment _ before 5:30pm. A. be finished B . will f