虚拟语气教案(1) 1 / 8虚拟语气Ⅱ教学案于亚东虚拟语气除主要用于条件句（也就是状语从句）外，还可用于主语从句、宾语从句、表语从句、定语从句等。
语从句、定语从句等。
1. 虚拟语气在主语从句中的应用“常用在It is (was)+形容词形容词/ 过去分词+that 引导的主语从句”的句型中的主语从句要用虚拟语气。
主语从句的谓语用should+动词原形(或should+have+过去分词)或只用动词原形(尤其是美国英语)。
should 在此是助动词，本身并无实义，这种主语从句中的should 有时有感情色彩。
感情色彩。
It's important that we （should ）work out a plan. （带有“要求”的含义）的含义） It's better that he go at once. （带有“建议”的意思）的意思）☆ 用于本句型的形容词并不多，常见形容词有：necessary ，important ，best, right, impossible ，preferable ，desirable, imperative, advisable ，essential ，reserved ，urgent ， 等。
等。
It is necessary that he （should ）be sent there at once ． It's strange that he should say so.I was glad that he should go.It is important that we should speak politely. It is a pity that she should fare so badly. It's right that you should think that way. ☆ 用于本句型中的过去分词就是表示提议、要求、命令等动词的过去分词，如suggested ，settled, required ，requested ，demanded ，urged ，decided, proposed ，ordered ，desired ，advised 等。
一．虚拟语气用于条件状语从句中1. 表示与现在事实相反或不可能发生：条件状语从句：一般过去时（虚拟语气中be→were）主句用：would(should, could, might)+动词原形。
If we had time now, we would read it again.If I were you, I would work hard.2. 表示与过去事实相反或不可能发生：条件状语从句：had+过去分词；主句：would(should, could, might)+have+过去分词。
If he had taken my advice, he would have succeeded in the test.If I had known your telephone number then, I would have called you.3. 表示与将来的事实可能相反或不可能发生：条件状语从句：①一般过去时②should +动词原形③were to+动词原形；主句：would(should, could, might)+动词原形。
If it should rain, the crops would be saved.If it were to snow tomorrow, they would not go out.P.S 虚拟条件句的特殊情况(1). 混合/错综型虚拟语气当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，称为‘错综条件句’，动词的形式要根据它所表示的时间作出相应的调整。
If you had followed my advice, you would be better now.(从句说的是过去，主句是现在)If I were you, I would have taken his advice.(从句是现在，主句是过去)（2）省略if的虚拟语气如果从句中含有were/ should/ had时，则可以把这三个词置于句首，省略if.采用倒装语序。
虚拟语气用法详解一、条件句中的虚拟语气1.条件句中虚拟语气的形式从句中提出一种与客观现实不相符或根本不可能存在的条件，主句会产生的一种不可能获得的结果。
条件句中的2. 条件句中的虚拟语气的举例(1) 将来时的条件句中的虚拟语气。
如：If he should go to Qing Hua University, he would make full use of his time. 如果他要上清华大学的话，他就会充分利用他的时间了。
If he were to come here, he would tell us abou t it. 如果他要来的话，他会通知我们一声。
(2) 现在时的条件句中的虚拟语气。
如：If he were free, he would help us. 要是他有空的话，它会帮助我们的。
If he studied at this school, he would know yo u well. 如果他在这所学校学习的话，它会对你很熟悉。
(3) 过去时的条件句中的虚拟语气。
如：If I had seen the film, I would have told you about it. 我如果看过这场电影，我会把电影内容告诉你了。
If I had got there earlier, I would have met Mr. Li. 如果我早点到那儿，我就会会到了李先生。
3.运用条件句中的虚拟语气时，须注意的几个问题(1)当从句的主语为第三人称单数时，谓语动词若是系动词be时，可用was代替were。
但在倒装虚拟结构及if I were you, as it were中，只能用were。
如：Were I ten years younger, I would study abroa d. 要是我还年轻十岁的话，我会去国外学习。
If I were you, I would try my best to grasp the chance. 要是我是你的话，我要尽力抓住这次机会。
