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1、精品_精品资料_高中英语语法总结大全之虚拟语气虚拟语气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,不肯定是事实,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形,故采纳虚拟语气.真实条件句真实条件句用于陈述语气,假设的情形可能发生,其中if是假如的意思.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 be put off
2、if it.A.will rainB. rainsC. rainedD. is rained答案 B .真实条件句主句为将来时,从句用一般现在时.留意：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式.非真实条件句 1）时态：可以表示过去,现在和将来的情
3、形.它的基本特点是时态退后.a.同现在事实相反的假设.可编辑资料 - - - 欢迎下载精品_精品资料_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 shouldwould 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 more careful.If my l
4、awyer 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 progress.含义： He was ill
5、 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 you should succeed, everything would be all right. If you were to succeed, everything would be all right.混合条件句主句与从句的动
6、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 .可编辑资料 - - - 欢迎下载精品_精品资料_虚拟条件句的倒装虚拟条件句的从句部分假如含有were, should, 或 had, 可将 if 省略,再把 were, should或 had 移到从句句首,实
7、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 be saved.留意：在虚拟语气的从句中,动词be的过去时态一律用 were ,不用
8、was, 即在从句中 be 用were 代替.If I were you, I would go to look for him.假如我是你,就会去找他.If he were here, everything would be all right.假如他在这儿,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. 在虚拟条件状语中假如有were, should, had 这三个词,通常将if 省略,主语提前, 变成 were, should,
9、had +主语的形式.但要留意,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.特别的虚拟语气词： should可编辑资料 - - - 欢迎下载精品_精品资料_1） It is demanded / nece ssary / a pity + that加动词原形,should 可省略.句型：1suggestedIt is2importantthat + should do结构中的主语从句的谓语动词要用should可编辑资料 - - - 欢迎下载精品_精品资料_3 a pity1sugges
10、ted, ordered, proposed, required,demanded, requested, insisted. + should do 2important, necessary, natural, strangea pity,a shame,no wonder3It is suggested that we should hold a meeting next week. It is necessary that he should come to our meeting 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, s
11、uggest, propose, require, demand, request, insist, command, insist + should do I suggest that we should hold a meeting next week.He insisted that he should be sent there.留意： 如 suggest, insist 不表示 建议 或坚持要某人做某事时 ,即它们用于其本意 示意、说明 、坚持认为 时,宾语从句用陈述语气.The guard at gate insisted that everybody obey the rules
12、.判定改错 :（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 suggestion, 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 sho
13、uld get more people to attend the conference. I make a proposal that we should hold a meeting next week.wish 的用法1）用于 wish 后面的从句,表示与事实相反的情形,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：可编辑资料 - - - 欢迎下载精品_精品资料_真实状况wish 后从句动作先于主句动词动现在时过去时作（be 的过去式为 were）从句动作与主句动作同时过去时过去完成时发生（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
14、wish I were as tall as you. 我期望和你一样高.He wished he hadnt said that. 他期望他没讲那样的话.I wish it would rain tomorrow. 我期望明天下雨就好了.2） Wish to do 表达法.Wish sb / sth to doI 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.比
15、较 if only 与 only ifonly if 表示 只有 . if only 就表示 假如 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.It is high time thatIt 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不行省略.It is time that t
16、he children went to bed.It is high time that the children should go to bed.可编辑资料 - - - 欢迎下载精品_精品资料_need 不必做 和本不该做 didnt need to do 表示： 过去不必做某事 , 事实上也没做. . neednt have done 表示： 过去不必做某事 , 但事实上做了.John went to the station with the car to meet Mary, so she didnt need to walk back home.约翰开车去车站接玛丽,所以她不必步行回
17、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. mustnt have hurriedB. couldnt have hurriedC. must not hurryD. neednt have hurried答案 D .neednt have done. 意为 本不必 ,即已经做了某事,而时实际上不必要.Mustnthave done 用法不正确,对过去发生的事情进行否定性推断应为couldnthave done, 不行能已经 . must not do不行以（用于一般现在时）可编辑资料 - - - 欢迎下载