if引导的条件状语从句课件

无忧,PPT,整理发布,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,If,引导条件状语从句,GRAMMAR,：,:,2015.1.21,位置,：,从句可放在主句之前或之后，但是放在主句之前须有逗号隔开,eg:,如果我有足够的钱，我就去环游世界,定义：,if,“,如果,假如,”,它引导的句子表示某事发生所需的条件，即,“,在,条件下，某事才能发生”，在句子中充当状语，因此称之为条件状语从句。（,If,引导的条件状语从句表示假如有从句的动作发生，就会有主句动作的发生）,If I have enough money,I will travel around the world,=I will travel around the world if I have enough money,If it rains tomorrow,I will stay at home.,一、什么是条件状语从句？,If I,get up,late,I,will be,late for school.,If I,dont finish,my homework,I,wont go,to bed.,If you,join,the band(,乐队,),you,will be,famous.,主从句的时态？,If,条件句：,条件句用于陈述语气，表示,将来的可能性，能力，允诺，命令，要求，请求，建议时，,假设的情况可能发生，其中,if,是,“假如，,如果,”,的意思。,主句,一般将来时,，从句用,一般现在时,。,构成,条件从句,主句,时态,If,一般现在时,主语,shall/will,+,动词原形,例句,If he comes,he will take us to the zoo.,运用“主将从现”的原则。,用法：,1.,如果主句是一般将来时，从句则用一般现在时。,If it rains,（从句），,I will stay at home.,Ill go with you if you dont want to go alone,（从句）,.,2.,如果主句含有,must,may,can,等情态动词，从句也要用,一般现在时。,If you drive too fast,you may have an accident.,You must stop if the traffic is red.,If you,finish,the homework,，,you,can go,home,如果你作业做完了就可以回家了。,If you,want,to lose weight you,must/should eat,less bread.,如果你想减肥，你必须少吃面包。,3.,如果主句是祈使句，从句同样要用一般现在时。,Don,t go and play football if you don,t finish your homework.,Please call me if he comes next Sunday.,练一练,：,1,。如果她早点儿起床，就有时间在家里吃早餐,If she_ _a little earlier,shell have time to eat,breakfast at home.,2,。如果你参加聚会，你将会过得很开心。,If you_ the party,you_ _ a great time.,3,。如果明天下雨，我们将不去野餐,If it _tomorrow,we _ _ for a picnic.,4,。如果你经常听英文歌，你将会喜欢英语,If you often _ _English songs,you_ _English.,gets up,join will have,rains wont go,listen to will like,1.If he_(not,do)it,I _(do)it.,2.If you _(be)late for school,my teacher _(be)angry.,are,will be,3.If she_(win)the prize,we _(be),happy.,wins,will be,4.If I _ (not,eat)so much,I _(get)thinner,.,5.If you _(tell)them,they _ (not,believe)you.,dont eat,will get,tell,wont believe,doesnt do,will do,用所给单词的正确形式填空：,6 I _(stay)at home if it _(rain).,7,.,If it _(not,rain),I _(go)out.,8,.,we _(play)football if it is _(sun).,9.If she _(become)a star,her parents _(be)proud of her.,10.He _(watch)TV if he _(be)free.,will stay,rains,doesnt rain,will go,will play,sunny,becomes,will be,will watch,is,2.If,从句（一般现在时），主句（一般现在时）,表示科学常识、事实、经常性的动作或倾向 自动会发生的事,1.If water,is heated,it,turns,to steam.,2.If people,dont get,enough sleep,their thinking ability,is reduced,.,3.If I,need,a haircut,I,usually,go,to the barbers near where I live.,4.People,often,dont go,out on Sundays if it,rains,.,1.as(so)long as.“,只要,，就,”,表示 一种前提条件,Youll succeed,as(so)long as(if only),you try hard.,只要你努力，你就会成功。,拓展：,那么，除了,if,之外，是否还有其他连词可以引导条件状语从句呢,2,unless,除非；若不；如果不,；除非在,时候,1.You will fail to arrive there in time,unless,you start earlier,如果你不早点动身，你就不能及时赶到那儿。,2.,Unless,bad weather stops me,，,I go for a walk every morning,除非天气不好，我每天早晨都要去散步。,3.I wont loan you,unless,you are in extreme need of money,若不是你急需用钱，我不会借钱给你的。,中考真题：,（,2011,安徽,）,1.If the rain _(stop)tonight,we will go to the cinema.,（,2012,黑龙江,）,2.I,ll buy a computer if I _(have)enoug money.,（,2013,内蒙古,）,3.You _(not get)nervous if you _(do)enough exercise.,（,2014,浙江,）,4.If she _(be)kind to me,I _(not argue)with her.,stops,have,wont get,do,is,wont argue,分析试题特点及做题思路：,1.,考连词,-,做题思路：,分析句子,-,判断关系,-,选择正确的连词：,1.You wont get nervous _you do enough exercise.,A.if,B,unless C,whether,2._ you hurry up,you will miss the early bus.,A.if,B,unless C,whether,分析试题特点及做题思路：,2.Youmay _ (pass)theexam,if,you_,(study)hard.,2.,考时态,-,做题思路：,认字,-,判断语境提供的时态特点,-,选择正确的时态,A.,rain,stay,B.,rains,stay,C.,rains,will stay,D.,rain,will,stay,1.,If,It_(rain)tomorrow,I_(stay),at home,.,A.pass,study B.will pass,study C.pass,will study D.passes,study,If Im ill,_.,I will see a doctor,Look and say,If Im late,_.,I will say sorry,条件状语从句在日常生中的应用：,If Im hungry,I will,_.,If Im,tired,I will,_.,Look and say,eat some food,have a rest,If it rains tomorrow,I_.,will watch TV at home,If it _ tomorrow,_.,Ill play basketball,doesnt rain,if,条件句不一般,几个要点记心间,;,条件句,放在前,逗号要放句中间。条件句表可能，主将从现不一般；,条件句表事实，主句常用现在时。,Summary,（,小结,）,If we study harder,we will do well in the exams,Try our best to study harder.,Homework,.,Finish the exercises in the workbook.,Thanks for listening.,Goodbye.,再见,