虚拟语气入门之虚拟条件句课件

虚拟语气入门虚拟语气入门If条件句条件句 If you cool water,it turns into ice.if 从句从句主句主句 1.If you heat metal,it melts.2.Water turns into ice if you cool it.if 从句从句主句主句从句从句主句主句从句从句主句主句从句在主句前时，从句在主句前时，_ （用（用/不用）逗号隔开不用）逗号隔开当主句在前时，则当主句在前时，则_（用（用/不用）逗号不用）逗号不用用If you drop a glass,it breaks.If you heat ice,it melts.主句和从句都用主句和从句都用_(时态时态)因为因为if引导的条件句是引导的条件句是_一般现在时一般现在时客观事实客观事实/普遍现象普遍现象Actions with definite results试着自己总结试着自己总结if 的用法：的用法：1.If you heat metal,it melts.2.Water turns into ice if you cool it.3.If you drop a glass,it breaks.如果if引导的条件句谈论的是一种_ 时，主句谓语动词便不用shall/will+动词原形，而直接用_时的动词形式。真理真理/客观事实客观事实一般现在一般现在Actions with possible results读下列例句，总结读下列例句，总结if 的用法：的用法：1.If we run,well get there in time.2.I will help you if you ask me.3.If you get up late,you will be late for school.由例句我们可以知道：在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实有可能发生的事实以其产生的相关结果，从句用_,主句用_.一般现在时态一般现在时态一般将来时态一般将来时态(主将从现主将从现)1.I will build many schools for the poor children if I win a billion dollars.2.If you freeze water,it will turn into ice.3.My uncle visits the museum if he will have time.正确正确will turn turnsvisits will visit,will have has判断正误，如果有误，请更正判断正误，如果有误，请更正Betty will visit the History Museum if it Betty will visit the History Museum if it _(rain)tomorrow._(rain)tomorrow.Ben wants to know if it_ Ben wants to know if it_(be)fine tomorrow.(be)fine tomorrow.If 引导的条件状语从句不用将来时，意思为“如果”。If 引导的宾语从句可以用将来时，意思为“是否”。doesnt rainwill be是否是否如如果果hard-workingIf she is hard-working,she will get good grades.get good gradesLook and sayIf you get up late,you will be late for school.Look and sayget up latelate for schoolgo fishing.If it is sunny this Sunday,well go fishing.Look and saysunny this SundayIf I have a lot of money,I will buy a big house.Look and saya lot of moneya big house包含条件从句的句子为条件句条件句。1.真实真实条件句 （假设的情况有可能发生）2.虚拟虚拟条件句 (纯粹假设/实现可能性不大）If I have a lot of money,I will buy a big house.a lot of moneya big houseIf I had a lot of money,I would buy a big house.包含条件从句的句子为条件句条件句。1.真实真实条件句 （假设的情况有可能发生）2.虚拟虚拟条件句 (纯粹假设/实现可能性不大）If I had a lot of money,I would.真实条件句，使用陈述语气。非真实条件句，使用虚拟语气。Be quiet!（请安静。请求）No smoking!(请勿吸烟。劝告）Keep off the grass.（勿践草坪禁止）Dont litter.（不要乱扔垃圾。劝告）Go and wash your hands.（命令）祈使语气使用动词原形表示与事实表示与事实相反相反或或根本不可能实现根本不可能实现的的事事.主观愿望主观愿望与与假设等假设等虚虚 拟拟 语语 气气if引导的条件状语从句引导的条件状语从句虚拟条件句虚拟条件句If I were a bird,I would fly into the sky.If I were taller,I could play basketball in NBA.If I had a lot of money,I might buy an island.If条件中的虚拟语气条件中的虚拟语气时时 间间 If If 条件句条件句主主 句句现在现在be用用 were do 用用 did would should +do sthcouldmightIf I am as tall as Yao Ming,I would be a famous player.were与现在事实相反虚拟与现在事实相反虚拟 Sorry,I dont have any money with me.If I had money now,I will lend you.would与现在事实相反虚拟与现在事实相反虚拟If he had got up early yesterday,he would not have been late for work.If he _（drive)more carefully,he _ (avoid)the accident yesterday.had driven would have avoided 懒羊羊：懒羊羊：如果我没有吃太多东西，如果我没有吃太多东西，就不会被灰太狼抓了。就不会被灰太狼抓了。If I _ too muchI _ caught.wouldnt have beenhadnt eaten If he had got up early yesterday,he would not have been late for work.If he had driven more carefully yesterday,he could have avoided the accident.If I hadnt eaten too much,I wouldnt have been caught.If条件中的虚拟语气条件中的虚拟语气时时 间间 If If 条件句条件句主主 句句过去过去had donewould should +have done sthcouldmight对将来情况的假设 时间时间 条件从句条件从句 主句主句 将来将来 一般过去时(did)should等+动词原形 were+to doshould+动词原形 If it rained tomorrow,I would stay at home.If it were to rain tomorrow,I would stay at home.If it should rain tomorrow,I would stay at home.1.判断是否虚拟判断是否虚拟2.判断虚拟时间判断虚拟时间3.动词正确动词正确if条件句 虚拟语气应对策略 if从句动词从句动词 主句动词主句动词现在现在过去式过去式 (be常用常用 were)would/could/might/should +动原动原过去过去had donewould/could/might/should+have done将来将来过去式过去式should+do were to dowould/could/might/should+动原动原If条件中的虚拟语气条件中的虚拟语气HomeworkFind out more example sentences of conditionals.