if引导的虚拟语气.pptx

真真实条件句和条件句和虚虚拟条件句条件句1.2.1.表示客表示客观观事事实实或真理或真理 If you freeze water,it turns to ice.If you eat a lot of chocolate,you put on weight.从句从句 主句主句 if+一般一般现现在在时时，一般，一般现现在在时时3.2.表示将来可能表示将来可能发生的事生的事 If he fails in the exam,he will let his parents down.You will certainly succeed if you keep on trying.从句从句 主句（主句（陈陈述句）述句）if+一般一般现现在在时时，一般将来，一般将来时时（will+动词动词原形）原形）4.3.给某人提建某人提建议或命令某人做某事或命令某人做某事 If you feel sleepy,go to bed.If you want to know how it works,read the instructions.从句从句 主句主句if+一般一般现现在在时时，祈使句，祈使句5.If引引导的虚的虚拟条件句，即非真条件句，即非真实条件句，表示条条件句，表示条件句所表示的条件根本不可能件句所表示的条件根本不可能实现或或实现的可的可能性很小。根据能性很小。根据动作作发生生时间的不同，含有非的不同，含有非真真实条件句的复合句的主从句的条件句的复合句的主从句的谓语动词采用采用不同的表达方式。具体分不同的表达方式。具体分为三种情况：三种情况：6.时间从句从句主句主句与与现在在事事实相反相反过去式去式（be 通常用通常用were）should would could +动词原形原形 might与与过去去事事实相反相反 had+过去分去分词 should would could +have+过去分去分词 might与与将来将来事事实相反相反过去式（去式（be 通常通常用用were）should+动词原形原形were to+动词原形原形 should would could +动词原形原形 might7.一、与现在在事实相反1.If I knew his telephone number,I would tell you.2.If I were you,I wouldnt be so proud.8.二、与过去去事实相反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.9.三、与将来将来的事实相反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.10.1.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.might11.2._,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 careful12.4.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 died13.5.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 saved14.6.If we _ the other road,we might have arrived here in time for the meeting.A.takeB.had takenC.tookD.have taken 15.16.Thank you!17.