牛津版高中英语模块六虚拟语气Grammar Focus课件

1、Grammar FocusIf : Subjunctive clause虚拟语气从句Subjunctive mood 由if引导的表示假设状态的句型，if 引导了一个状语从句，与主句联合构成。共分为四种基础句型：1.纯条件的虚拟语气2.与现在事实相反的虚拟语气3. 与过去事实相反的虚拟语气。4. 与将来状况相反的虚拟语气。1.纯条件的虚拟语气即我们所说的“主将从现”句型。If it rains, we will choose to stay at home.If they work hard, they will always win.If the sun rises from the wes

2、t, The earthwill change into another world.2.与现实事实相反的虚拟语气使用格式为：if+主语+一般过去式 ，主语+would/could/might/should/ought to +V.原形If I were you , I whould tell her the truth.If they were you. They might go that way .If she were fine, she could help you with your work .If there were no planes, we human might spe

3、nd much more time travelling from Northpole to South pole than we expected.特殊句子If I had time, I would write the letter.If I had time, I should write the letter.If I had time, I ought to write the letter.But you cant say :If I had the money, I must help the poor.与过去事实相反的虚拟语气If的从句要用过去完成时态来写，主句则用助动词(wo

4、uld/could/might/should)的过去式 +have +done的格式来写。表达的意思为：与过去/当时发生的事情相反的情况。If I had arrived there earlier. I might have rung him up .If the car had driven away a few more minutes earlier. They would have survivedfrom the terrorists attack.If we Chinese had been more power during Qing dynasty. We would hav

5、e never been invaded by the Japanese Nazists.If he had taken your advice, he would haveavoided making thr mistake. 意为：(As he didnt take your advice, he made themistake.)与将来状况相反的虚拟语气if +主语+should+V原形，主语+would/could/might/should+ V原形。表示可能性较低的说法：If you should fail me , you could cut off yourhead when y

6、ou come back to see me .万一你失败了，你就提头来见我。If it should rain, I would stay home.特别句型，省略IF的虚拟语气句型“were to 的用法，表示与常理相悖的句型。Eg. :The pig cant fly.(常理，真理）猪不能飞。If the pig were to fly, We would be faint !如果猪都能飞，那我们会为此而昏厥。If the sun were to rise in the west, How surprised these sunflowers would be .But for / if onlyBut for(若非，要不是)=without后面接名词，主句用(would/could/should)have doneBut for the help of Sally, I would have knocked off the lady.Without computer, People could have savedany information on paper.If only(如果，假如）If only 后接一般过去式或是过去完成时的句子。If only she were here,w