if引导的条件状语从句课件.ppt

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1、,If 引导条件状语从句,GRAMMAR：,华陀中学:,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 rain

2、s 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。,运用“主将从现”的原则。,用法：1.如果主句

3、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

4、 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。Dont go and play football if you dont 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

5、 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

6、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 _(

7、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 sl

8、eep,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,2unless 除非；若不；如果

9、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 t

10、o the cinema.（2012黑龙江）2.Ill 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 enoug

11、h exercise.A.if,B,unless C,whether2._ 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)theexamifyou_(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,s

12、tudy 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,