引导的虚拟语气演示课件.ppt

1,真实条件句和虚拟条件句,2,3,1.表示客观事实或真理 If you freeze water, it turns to ice. If you eat a lot of chocolate, you put on weight.,真实条件句,从句 主句 if+一般现在时，一般现在时,4,2.表示将来可能发生的事 If he fails in the exam, he will let his parents down. You will certainly succeed if you keep on trying.,从句 主句（陈述句） if+一般现在时，一般将来时（will+动词原形）,5,3.给某人提建议或命令某人做某事 If you feel sleepy, go to bed. If you want to know how it works, read the instructions.,从句 主句 if+一般现在时，祈使句,6,If引导的虚拟条件句，即非真实条件句，表示条件句所表示的条件根本不可能实现或实现的可能性很小。根据动作发生时间的不同，含有非真实条件句的复合句的主从句的谓语动词采用不同的表达方式。具体分为三种情况：,虚拟条件句,7,8,一、与现在事实相反,If I knew his telephone number, I would tell you . If I were you ,I wouldnt be so proud.,9,二、与过去事实相反1.If he had taken my advice, he would not have made such a mistake.2.If I had got there earlier, I would have met her.,10,三、与将来的事实相反1.If there were a heavy snow next Sunday, we would not go skating.2.If she should come, I would tell her about the matter.,11,The printer is of good quality. If it _break down within the first year , we would repair it at our expense.A. would B. shouldC. couldD. might,12,2._,the forest fire would have been discovered much earlier.A. But for their careB. If they were careful C. Without their careD. If they had been more careful,13,4.The weather has been very hot and dry.Yes. If it had rained even a drop, things would be much better now! And my vegetables_.A. wouldnt dieB. didnt dieC. hadnt diedD. wouldnt have died,14,5.Had I known about the computer program, a huge amount of time and energy_.A. would have been savedB. had been savedC. will be savedD. was saved,15,6.If we _ the other road, we might have arrived here in time for the meeting.A. takeB. had takenC. tookD. have taken,16,17,Thank you !,