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1、第四讲 虚拟语气概说语气是以动词形式表现出来的语法特征，它表示说话人对事物所持的态度。1）陈述语气 She is very clever.2）祈使语气 Dont be late for the meeting.3）虚拟语气（表示假设的情况、主观愿望等。） If there were no gravity, we should not be able to walk.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 violi
2、n.典型例题The volleyball match will 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)
3、 +动词原形，而直接用一般现在时的动词形式。2 虚拟语气的形式 (8种），一般应用在三种结构中： 1）“条件从句”结构；2）动词wish 后接的宾语从句；3）形容词结构后接的主语从句.非真实（虚拟）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. 表示与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 work
4、ed harder, she would have succeeded. The rice would not have been burnt if you had been 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 hi
5、m about it. If he had not been ill and missed many classes, he would have made greater 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If you succeeded, everything would be all right.If
6、 you should succeed, everything would be all right.If you were to succeed, everything would be all right.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
7、.我希望和你一样高。He wished he hadnt 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 to see the manager. I wish the manager to be informed at once. (= I want the manager to be informed at once.)主语从句It is +形容词（名词） that 主
8、语+should do( strange, important, incredible, surprising,a pity, a shame, a wonder)It is +过去分词 that +should do（desired, suggested, requested decided, reported, proposed, ordered)It is (high) time that 主语+一般过去时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had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。 Were they h
9、ere 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 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we
10、re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 wereC. Were ID. Was I 答案C. 在虚拟条件状语中如果有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 Werent I to do.比较if only与only ifonly 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 only he comes early.但愿他早点回来。
