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1、WORD 文档 专业资料 16. 虚拟语气 1）概念 虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实， 或与事实相反。 2）在条件句中的应用 条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示 的是假设的或实际可能性不大的情况，故采用虚拟语气。 16.1 真实条件句 真实条件句用于陈述语气，假设的情况可能发生，其中if 是如果的意思。 时态关系 句型：条件从句主句 一般现在时shall/will + 动词原形 If he comes, he will bring his violin. 典型例题 The volleyball match will
2、be put off if it _. A. will rain B. rains C. rained D. is rained 答案 B。真实条件句主句为将来时，从句用一般现在时。 注意： 1）在真实条件句中，主句不能用be going to 表示将来，该用shall, will. (错 ) If you leave now, you are never going to regret it. (对 ) If you leave now, you will never regret it. 2）表示真理时，主句谓语动词便不用shall (will) + 动词原形，而直接用一般现在时 的动词形
3、式。 16.2 非真实条件句 1）时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。 a. 同现在事实相反的假设。 句型：条件从句主句 一般过去时should( would) + 动词原形 If they were here, they would help you. b. 表示于过去事实相反的假设。 句型：条件从句主句 过去完成时should(would) have+ 过去分词 If she had worked harder, she would have succeeded. The rice would not have been burnt if you had been
4、 more careful. If my lawyer had been here last Saturday, he would have prevented me from going. If he had come yesterday, I should / would have told him about it. 含义： He did not come yesterday, so I did not tell him about it. If he had not been ill and missed many classes, he would have made greater
5、 progress. 含义：He was ill and missed many lessons, so he did not make greater progress. c. 表示对将来的假想 句型：条件从句主句 一般过去时should+ 动词原形 were+ 不定式would + 动词原形 should+ 动词原形 WORD 文档 专业资料 If you succeeded, everything would be all right. If you should succeed, everything would be all right. If you were to succeed
6、, everything would be all right. 17. 混合条件句 主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时 间不同而不同，这叫做混合条件句。 If you had asked him yesterday, you would know what to do now. （从句与过去事实相反，主句与现在事实相反。） If it had rained last night ( 过去 ), it would be very cold today ( 现在 ). 18. 虚拟条件句的倒装 虚拟条件句的从句部分如果含有 were, should, 或 h
7、ad, 可将if 省略，再把were, should 或 had 移到从句句首，实行倒装。 Were they here now, they could help us. =If they were here now, they could help us. Had you come earlier, you would have met him =If you had come earlier, you would have met him. Should it rain, the crops would be saved. =Were it to rain, the crops would
8、 be saved. 注意： 在虚拟语气的从句中，动词be 的过去时态一律 用“were“ ，不用was，即在从句中 be 用 were 代替。 If I were you, I would go to look for him. 如果我是你，就会去找他。 If he were here, everything would be all right. 如果他在这儿，一切都会好的。 典型例题 _ to do the work, I should do it some other day. A. If were I B. I were C. Were I D. Was I 答案 C. 在虚拟条件状
9、语中如果有were, should, had 这三个词，通常将if 省略， 主语 提前 , 变成were, should, had +主语的形式。但要注意，在虚拟条件状语从句中，省略连词 的倒装形式的句首不能用动词的缩略形式。如我们可说Were I not to do., 而不能说 Weren t I to do. 19. 特殊的虚拟语气词：should 1） It is demanded / necessary / a pity + that ?结构中的主语从句的谓语动词要用should 加动词原形，should 可省略。 句型： (1)suggested It is (2)importan
10、t that?+ (should) do (3) a pity (1)suggested, ordered, proposed, required, demanded, requested, insisted；+ (should) do (2)important, necessary, natural, strange a pity, a shame, no wonder (3)It is suggested that we (should) hold a meeting next week. It is necessary that he (should) come to our meeti
11、ng tomorrow. 2）在宾语从句中的应 用 在表示命令、建议、要求等一类动词后面的从句中。 order, suggest, propose, require, demand, request, insist, command, insist + (should) do I suggest that we (should) hold a meeting next week. WORD 文档 专业资料 He insisted that he (should ) be sent there. 注意：如 suggest, insist 不表示 “建议“ 或 “坚持要某人做某事时“，即它们用于其
12、本意 “暗示、表明“、 “坚持认为“时，宾语从句用陈述语气。 The guard at gate insisted that everybody obey the rules. 判断改错: （错）You pale face suggests that you (should) be ill. (对)Your pale face suggests that you are ill. (错 ) I insisted that you ( should) be wrong. (对)I insisted that you were wrong. 3）在表语从句，同位语从句中的应 用 在 suggest
13、ion, proposal, idea, plan, order, advice 等名词后面的表语从句、同位语从句 中要用虚拟语气，即（should ）+动词原形。 My idea is that we (should) get more people to attend the conference. I make a proposal that we (should) hold a meeting next week. 20. wish 的用法 1）用于wish 后面的从句，表示与事实相反的情况，或表示将来不太可能实现的愿望。 其宾语从句的动词形式为： 真实状况wish 后 从句动作先于主
14、句动词动作现在时过去时 （ be 的过去式 为were ） 从句动作与主句动作同时发生过去时过去完成 时 （ had + 过去分词） 将来不大可能实现的愿望将来时would/could + 动词原形 I wish I were as tall as you. 我希望和你一样高。 He wished he hadn t said that. 他希望他没讲那样的话。 I wish it would rain tomorrow. 我希望明天下雨就好了。 2） Wish to do 表达法。 Wish sb / sth to do I wish to see the manager. = I want
15、 to see the manager. I wish the manager to be informed at once. (= I want the manager to be informed at once.) 21. 比较if only 与 only if only if 表示 “ 只有 “； if only 则表示 “如果 ?就好了“。 If only 也可用于陈述语气。 I wake up only if the alarm clock rings. 只有闹钟响了，我才会醒。 If only the alarm clock had rung. 当时闹钟响了，就好了。 If on
16、ly he comes early. 但愿他早点回来。 22. It is (high) time that It is (high) time that 后面的从句谓语动词要用过去式 或用should 加动词原形，但 should 不可省略。 It is time that the children went to bed. It is high time that the children should go to bed. 23. need “ 不必做 “和 “本不该做“ didn t need to do 表示：过去不必做某事, 事实上也没做。. needn t have done 表
17、示：过去不必做某事, 但事实上做了。 WORD 文档 专业资料 John went to the station with the car to meet Mary, so she didn t need to walk back home. 约翰开车去车站接玛丽，所以她不必步行回家了。 John went to the station with the car to meet Mary, so she neednt have walked back home. 约翰开车去车站接玛丽，所以她本不必步行回家了。(Mary 步行回家， 没有遇上John 的车。 ) 典型例题 There was plenty of time. She _. A. mustn t have hurried B. couldn t have hurried C. must not hurry D. needn t have hurried 答案 D。 needn t have done. 意为 “本不必 “，即已经做了某事，而时实际上不必要。 Mustn t have done 用法不正确，对过去发生的事情进行否定性推断应为couldn t have done, “ 不可能已经“ 。 must not do 不可以（用于一般现在时）。谢谢. 谢谢.