if条件状语从句课件.ppt

1、If sentencesIf 引导的条件状语从句引导的条件状语从句u If you like sightseeing,you will love it.u If you visit Peoples Square,you can also see famous buildings around it.u If you walk along the Bund,you will see many old buildings.u If you enjoy history and natural beauty,you will love this garden.阅读73页文章，找出含有If条件状语从句。

2、Learning Arms:1.了解并学习表示条件状语从句的功能和用法。了解并学习表示条件状语从句的功能和用法。2.掌握掌握if引导的主从句的时态。引导的主从句的时态。if “如果如果,假如假如”它引导的句子表示某事发生所它引导的句子表示某事发生所需的条件，即需的条件，即“在在条件下，某事才能发生条件下，某事才能发生”，在句，在句子中充当状语，因此称之为条件状语从句。（子中充当状语，因此称之为条件状语从句。（If引引导的条件状语从句表示假如有从句的动作发生，就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会有主句动作的发生）例如：If it rains tomorrow,I w

3、ill stay at home.一、什么是条件状语从句？一、什么是条件状语从句？If you lik sightseeing,you will love it if clause从句从句main lause主句主句 1.If you heat metal,it will melt.如果把金属加热，它就会融化。如果把金属加热，它就会融化。2.Water will turn into ice if you cool it.如果你冷却水，它就会变成冰。如果你冷却水，它就会变成冰。if clause从句从句main clause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，

4、_ （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 visit Peoples Square,you can see famous buildings.if you walk alond the bund.You will see many old buildings if you walk alond the bund.主句主句主句主句 读下列例句，试着自己总结读下列例句，试着自己总结if if 在句中在句中的位置的位置 If you visit Peoples Square,you can alsosee famou

5、s buildings around it.=You can also see famous buildings around it if you visit Peoples Square.If you walk alone the bund,you will seemany old buildings.=You will see many old building if you walk alone the bund.位置：从句可放在主句之前或之后，但是放在位置：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。主句之前须有逗号隔开。主句前主句后主句前主句后If I get up la

6、te,I will be late for school.If I dont finish my homework,I wont go to bed.If you join the band(乐队乐队),you will be famous.主从句的时态？主从句的时态？If条件句：条件句用于陈述语气，表示假设的情况可能发生，其中 if 是“假如，如果”的意思。主句主句一般将来时一般将来时，从句用，从句用一般现在时一般现在时。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.运用运用“主将从现主将

7、从现”的原则的原则。判断正误，如果有误，请更正判断正误，如果有误，请更正1.If you will do more exercise this summer,you will be very fit.2.The candle burns,if you light it.will do do把逗号去掉把逗号去掉If you get up late,you will be late for school.get up latelate for schoolIf the telephone rings,I will answer it.ringanswerIf I have a lot of mon

8、ey,I will buy a big house.a lot of moneya big househard-workingIf she is hard-working,she will get good grades.get good gradesgo fishing.If it is sunny this Sunday,Ill go fishing.sunny this Sunday()1.If it _ sunny tomorrow,I _ boating.A.is go B.will be,go C.is,will go D.will be,will go()2.-what will

9、 you do if it _ tomorrow,-Ill stay at home and watch TV.A.rain B.rains C.will rain D.is raining CB 当堂检测当堂检测()3.If he _,I _ him the time.A.comes,tell B.will come,will tellC.comes,will tell D.will come,tell()4.If it _,it _cold.A.snows,will be B.snows,isC.will snow,will be D.will snow,is()5.If you _a s

10、tone into water,it _.A.put,sinks B.put,will sinkC.will put,sinks D.will put,will sink CA A 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 stayrainsdoesnt

11、rainwill gowill playsunnybecomeswill bewill watchis用所给单词的正确形式填空：用所给单词的正确形式填空：if 条件句不一般条件句不一般,几个要点记心间几个要点记心间;条件句条件句,放在前放在前,逗号要放句中间。逗号要放句中间。条件句表可能，条件句表可能，主将从现不一般。主将从现不一般。Summary（小结）HomeworkFinish the exercises in the workbook.名言集锦名言集锦 If you study harder,you will do well in the exams,Try your best to study harder.