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1、虚拟语气 虚拟语气是动词的一种特殊形式，用来表达说话人的愿望、请求、意图、建议、惊奇、设想 等。虚拟语气是英语语法的难点，考生必须熟练掌握。以下从五个方面介绍。 1虚拟条件句中虚拟语气的运用 虚拟条件句从时间上又分为与现在事实相反， 与过去事实相反， 与将来事实可能相反三种情 况。表示与现在事实相反的，if 从句用过去式，主句用 would（或 could, should, might）加 原形动词。 与过去事实相反的， 从句用过去完成时， if 主句用 would （或 could, should, might） +have done 结构。与将来事实可能相反的，if 从句用 should
2、(或 were to)加动词原形，主句 用 would 加动词原形。 1）If a better material _, the strength of the part would have been increased. A. had been used B. had been using C. being used D. using 根据前面的讲解，正确答案为 A。 2）Had the weather been good, the children _ out for a walk. A. had gone B. could have gone C. would go D. went 答
3、案为 B。与过去的事实相反。当 if 从句中含有 were, had, should 这三个词时，if 可以 省略，主谓倒装。 2某些动词后的宾语从句以及某些名词后的表语或同位语从句中虚拟语气的运用 这些动词或名词包括：suggest(suggestion),propose(proposal),advise (advice),demand, insist, order, request, require, recommend, desire, ask, decide 等表示建议、命令或要求的词。在这些 从句中，谓语形式为 should 加动词原形，should 可以省略。 例：The gene
4、rals command was that the soldiers _ their fort and carry out more important task. A. would leave B. leave C. left D. have left 答案为 B。 3在 It is desired(或 desirable), It is important 等结构后面的主语从句中，动词用原形或 should+原形动词。 这些结构有： It is suggested, It is requested, It was ordered, It is necessary, It is essent
5、ial. It is vital, It is urgent, It is impossible, It is preferable, It is advisable, It was proposed 等。 例：Its desired that she _ to teach us at least twice a week, A. comes B. will come C. come D. may come 答案为 C。 4在 would rather, as if/though 以及 wish 后边 that 从句中虚拟语气的运用。 1）I am too busy these days. I
6、 would rather all of you _ next month for a dinner. A. come B. would come C. came D. have come 答案为 C。would rather 后面的从句中，动词形式用过去式。 2）He talks as if he _ everything in the world.A. knows B. knew C. had known D. would have know 正确答案为 B。在 as if/though 后边的方式状语从句中，表示与现在事实相反或对现在 的情况有所怀疑，动词用过去式；如果表示的是想象中的过
7、去的动作，用过去完成时。本句 表示对现在的情况有所怀疑。 3）You look as if you had seen a ghost. 此句中 as if 后边是说话人想象中的过去的动作，所以用过去完成时。 4）I wish I knew his address. 在 wish 后边的从句中，如果指现在或将来的愿望，动词用过去式。这句话告诉我们说 话人并不知道他的地址。 5）Peter wishes that he _ law instead of literature when he was in college. Acould study B. studied C. had studied
8、 D. would study 答案为 C。在 wish 后边的从句中，如果表示过去没有实现的愿望，动词用过去完成时。 5在 It is (high) time 后边的 that 从句中，动词用过去式，表示该做某事了。 例：Dont you think it is time you _ smoking? A. give up B. gave up C. would give up D. should give up 答案为 B。虚拟语气专项练习：1. We desire that the tour leader _ us immediately of any change in plans.
9、A. inform B. informs C. informed D. has informed 2. It was proposed that the matter _ discussed at the next meeting. A. will be B. was C. could be D. be3. The young driver looked over the engine carefully lest it _ on the way. A. goes wrong B. should go wrong C. went wrong D. would go wrong 4. It is
10、 essential that these application forms _ back before the deadline. A. must be sent B. will be sent C. are sent D. be sent 5. Its already 5 oclock now. Dont you think its about time _? A. we are going home B. we go home C. we went home D. we can go home 6. Id rather you _ make any comment on the iss
11、ue for the time being. A. didnt B. wouldnt C. dont D. shouldnt 7. That tree looked as if it _ for a long time. A. hasnt been watered B. didnt water C. hadnt been watered D. wasnt watered 8. She didnt go to the party, but she does wish she _ there. A. has been B. had been C. would have been D. would
12、be 9. _ the whole situation, I wouldnt have said it. A. If I should know B. Had I known C. If I knew D. Were to know 10. The traffic was very heavy; otherwise I _ here 30 minutes sooner. A. could have been B. would be C. should be D. had been 练习答案： 1-10 ADBDC ACBBA情态动词1.情态动词无人称变化，在句子中和动词原形一起组成谓语。只有
13、ought 后面接 to do。 情态动词后接完成时的用法:情态动词用来表示能力、允许、许诺、可能、必须、劝告、意 愿等概念或态度。2Must+现在完成时结构：这一结构表示对过去一个动作比较有把握的猜测。 例：I believe he _ an accident, otherwise he would have arrived on time. A. would have had B. could have had C. should have had D. must have had 答案为 D。 3should (ought to )have done 用来表示本来应该做却没有做的事情。
14、例：Im sorry I couldnt get in touch with him before he left, I _ him earlier. A. had a telephone B. have phoned C. should have phoned D. should be phoned 答案是 C。中文意思是“我很抱歉我没能在他走之前和他联系上，我本应早点儿给他打 电话的。” 4Could+现在完成时，表示本来能做的事情而没有做。 例：Mary _ that coat, but she chose to lend the money to a needy neighbour.
15、A. could have bought B. must have bought C. can buy D. could buy 答案为 A。玛丽本来可以买那件大衣的，但是她把钱借给一个更急需的邻居了。时态 一、 如何解答时态问题 方法一：看时间状语 例：Youve already missed too many classes this term. You _ just last week. A. missed B. would miss C. had missed D. have missed 方法二：比较两个动作的先后顺序 例：Anne asked Tom _ the key. A. when he left B. where he had left C. how he left
