条件状语从句市公开课一等奖省赛课微课金奖课件.pptx

,单击此处编辑母版标题样式,2015/4/13,#,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,条件状语从句,第1页,if (,假如,),，,unless (,假如不,),so/as long as(,只要,),once(,一旦,),in case(,万一,),条件状语从句惯用连词：,第2页,引导条件状语从句最惯用连词是,if,由,if,引导条件状语从句表示在某种条件下某事很可能发生。如,:,If,you,ask,him,he,will help,you.,假如你请他帮忙,他会帮你。,If,you,fail,in the exam,you,will let,him down.,If 引导条件状语从句(1),第3页,当主句为,未来时态或含有未来意时,，条件状语从句通常要用,普通现在时表示未来意义,，而不能直接使用未来时态：,Ill stay,at home,if,it,rains,tomorrow.,要是明天下雨，我就呆在家里。,【注】有时也可见到,if you will,这么说法，但那不是未来时态，而是表示,意愿或委婉请求,(,此处,will,是情态动词,),：,If you,will,wait for a moment,I,ll,go and tell the manager that you are here.,请,等一下，我去告诉经理说你来了。,If 引导条件状语从句(2),第4页,条件状语从句中普通不使用未来时态，尽管,主句,使用,将,来,时态，而,从句,用,普通现在时,或,现在完成时,。,I,will come,to see you if I,have,time.,我有时间，我就来看你。,If,the rain,stops,I,shall go,out for a walk.,假如雨停了，我就出去散步。,If,you,know,the answer,please raise,your hand.,Dont play games,unless you,has finish,your homework.,Unless,you,put,on a coat,you,may catch,a cold.,学习条件状语从句应注意以下几点：（一）,第5页,(2),if,从句,+,祈使句,If,you,want,to go,please let,me know.,If,the green light,isnt,on,wait for,a minute.,(3),祈使句,+and/or+,陈说句。相当于,if,状语从句。,Study hard,and,you,will pass,the exam.,=,if,you study hard,you,will pass,the exam.,Hurry up,or,you will be late.,=if you,dont hurry,up,you,will be,late.,Work hard,_ you may catch up with your classmates.,A.or B.but C.and D.yet,学习条件状语从句应注意以下几点：(二）,C,第6页,(4,),注意条件状语从句是经常发生和普通将会发生情景和事件，则主句多用普通现在时态。,【例】,if,bears,are,in danger,they,attack,people.,假如熊处于危险之中，它们就会对人进行攻击。,学习条件状语从句应注意以下几点：(三）,第7页,（,5),条件状语从句中,省略,。,Come tomorrow,if(it is)possible,.,可能话，明天来。,I will buy a DVD set,if (it is)necessary,.,学习条件状语从句应注意以下几点：(四）,第8页,If,（假如）,引导,条件状语,从句和,if(,是否,),连接,宾语从句,区分：,If,you,use,your head,you,ll find,a way.,假如,你动动脑子，你就会想出方法。,I wonder,if,he has finished his work.,我想知道他,是否,完成他工作了。,学习条件状语从句应注意以下几点：(五）,第9页,10,（）,1.I dont know if _ tomorrow.,A.it doesnt rain B.the rain will stops,C.the rains wont stop D.it wont rain,（）,2.The volleyball match will be put off,if it _.,A.will rain B.rains,C.rained D.is raining,练习（1）,D,B,第10页,（）,3.Difficulties are nothing if we _ not afraid of them,A.will B.shall C.are D.do,练习（2）,C,C,（）,4.I dont like to be interrupted if I _.,A.speak B.will speak C.am speaking D.spoke,B,（）,5.If you _ the book you will understand the story better.,A.will be reading B.have read,C.will have read D.read,第11页,（）6,.Ill go to meet you,，,if I _ free then.,A.would be B.will be C.am D.was,练习（3）,C,B,（）7,.If you,to the music,buy a CD.,A.will listen B.listen,C.listening D.listened,第12页,练习（4）,(),9,.Be careful,if you _ want to make mistakes.,A.wont B.dont C.didnt D.not,(),10,.If he _,I _ go swimming alone.,A.doesnt come will go B.wont come;will go,C.will come;wont go D.is coming;dont go,(),8,.Work hard if you _ to get a good mark.,A.wanted B.wanting C.want D.will want,C,B,A,第13页,练习（5）,1,If she _(finish)work early,she _(go)home.,2,If the weather_,（,be,）,fine,，,we_(go)for a walk.,3.If I_(have)time tonight,I _(finish)the book Im reading.,第14页,练习（6）,4.If I _(rain)next weekend,we_(not be able to)plant the vegetable.,5.If it_(rain),we_(stay)at home.,6.If she_(arrive),she _(phone)me.,第15页,练习（7）,7.If he_(call),tell him Ill ring back.,8.,I dont know if it_(rain)tomorrow.If it _(rain),we _(not go)to school,.,第16页,感激您聆听！,第17页,if,从句还表示,不可实现条件或根本不可能存在条件,也就是一个虚拟条件或假设,从句多用,普通过去时或过去完成时,。如,:,If,I,were,you,I,would invite,him to the party.,I,would have,arrived much earlier,if,I,had not been caught,in the traffic.,假如没有堵车,我会到早一点儿。,If 引导虚拟条件句(3),第18页,1.unless conj.,除非,若不,除非在,时候,You,will fail,to arrive there in time,unless,you,start,earlier.,假如你不早点动身,你就不能及时赶到那儿。,Unless,it,rains,the game,will be,played.,除非下雨,比赛将照常进行。,Unless引导条件状语从句,第19页,as/so long as,只要,As long as,you,promise,to come,Ill wait for,you until you come.,只要你答应,我就等你来。,So long as,youre happy,it,doesnt matter,what you do.,只要你高兴，你做什么都没相关系。,You,may borrow,my book,as long as,you,keep,it clean.,只要你保持书清洁，你就能够把我书借去。,Take,your umbrella,in case,it,rains.,带着你伞吧，以防下雨。,as/so long as引导条件状语从句,第20页,当主句为未来时态或含有未来意时，条件状语从句通常要用普通现在时表示未来意义，而不能直接使用未来时态：,Ill stay at home if it rains tomorrow.,要是明天下雨，我就呆在家里。,【注】有时也可见到,if you will,这么说法，但那不是未来时态，而是表示意愿或委婉请求,(,此处,will,是情态动词,),：,If you will wait for a moment,Ill go and tell the manager that you are here.,请等一下，我去告诉经理说你来了。,条件状语从句时态,第21页,【注】除以上基本引导条件状语从句隶属连词外，还有动词尤其是其分词形式,(,如,suppose,supposing,provided,providing,等,),和介词短语,(,如,in case,on condition that,等,),也可用作连词表示条件：,In case,I forget,please remind me about it.,万一,我忘记，请提醒我一下。,I will come,on condition(that,)she is invited too.,假如,邀请她来,那我就来。,He may go with us,provided providing,he arrives in time.,他,若,及时到，就能够和我们一起走。,Suppose,和,supposing,引导,条件状语从句,时，通惯用于主句为疑问句场所：,Suppose,the boss saw you,，,what would he say?,假如,老板看到你，他会怎样说,?,Supposing,he does not come,shall we go without him?,他,若,不来，是不是不带他去,?,条件状语从句其它形式,第22页,条件状语从句中普通不使用未来时态，尽管主句使用将,来时态，而,从句,用普通现在时或,现在完成时,。,I will come to see you if I have time.,我有时间，我就来看你。,If,the rain stops,I shall go out for a walk.,假如雨停了，我就出去散步。,Dont play games unless you has finish your homework.,If,you know the answer,please raise your hand.,Unless,you put on a coat,you may catch a cold.,注意条件状语从句是经常发生和普通将会发生情景和事件，则主句多用普通现在时态。,【例】,if,bears are in danger,they attack people.,假如熊处于危险之中，它们就会对人进行攻击。,条件状语从句中省略。,【例】,Come tomorrow,if(it is)possible,.,可能话，明天来。,I will buy a DVD set,if (it is)necessary,.,学习条件状语从句应注意以下几点：,第23页,