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1、If 引导条件状语从句引导条件状语从句 GRAMMAR：e.g.HespeaksEnglishfluently. Wesleepatnightathome.Icomespeciallytoseeyou.Tenyearsago,ShebegantoliveinDalian.Weshouldservepeopleheartandsoul.Whenshewas12yearsold,shebegantoliveinDalian.句子中表示地点、时间、原因、目的、结果、条件、方向、程度、方式和伴随状况等的成分状语一般由副词、介词短语、分词和分词短语、名词、不定式,句子等来担当。用一个句子充当状语成分，那
2、个句子就是状语从句。1.时间状语从句2.条件状语从句条件状语从句3.比较状语从句比较状语从句4.结果状语从句结果状语从句5.原因状语从句原因状语从句6.目的状语从句目的状语从句7.让步状语从句让步状语从句8.方式状语从句方式状语从句9.地点状语从句地点状语从句状语从句位置：从句可放在主句之前或之后，但是放在主句之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前须有逗号隔开eg:如果我有足够的钱，我就去环游世界如果我有足够的钱，我就去环游世界定义：定义：if“如果如果,假如假如”它引导的句子表示某事发生它引导的句子表示某事发生所需的条件，即所需的条件，即“在在条件下，某事才能发生条件下，
3、某事才能发生”，在，在句子中充当状语，称之为条件状语从句。（句子中充当状语，称之为条件状语从句。（ If引导引导的条件状语从句表示的条件状语从句表示假如有从句的动作发生，就会假如有从句的动作发生，就会有主句动作的发生有主句动作的发生 ）If I have enough money, I will travel around the world =I will travel around the world if I have enough moneyIfitrainstomorrow,Iwillstayathome.一、什么是条件状语从句？一、什么是条件状语从句？IfIgetuplate,Iw
4、illbelateforschool.IfIdontfinishmyhomework,Iwontgotobed.Ifyoujointheband(乐队乐队),youwillbefamous.主从句的时态？主从句的时态？1.If条件句：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_.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“主将从现主将从现”的原则的原则。一般现在时态一般将来时态用法：1.如果主句是一般将来时
5、，从句则用一般现在时。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.如果主句含有如果主句含有must,may,can等情态动词，从句也要用等情态动词，从句也要用一般现在时。一般现在时。If you drive too fast, you may have an accident. You must stop if the traffic is red.Ifyoufinishthehomework，youcangohom
6、e如果你作业做完了就可以回家了。如果你作业做完了就可以回家了。Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥，你必须少吃面包。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。Dontgoandplayfootballifyoudontfinishyourhomework.PleasecallmeifhecomesnextSunday.练一练练一练：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 breakfas
7、t 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.getsupjoinwillhaverainswontgolistentowilllike1.Ifhe_(not,do)it,I_(do)it.2.Ifyou_(be)lateforschool,myteacher_(be)ang
8、ry.arewillbe3.Ifshe_(win)theprize,we_(be)happy.winswillbe4.IfI_(not,eat)somuch,I_(get)thinner.5.Ifyou_(tell)them,they_(not,believe)you.donteatwillgettellwontbelievedoesntdowilldo用所给单词的正确形式填空：用所给单词的正确形式填空：6I_(stay)athomeifit_(rain).7.Ifit_(not,rain),I_(go)out.8.we_(play)footballifitis_(sun).9.Ifshe_(
9、become)astar,herparents_(be)proudofher.10.He_(watch)TVifhe_(be)free.willstayrainsdoesntrainwillgowillplaysunnybecomeswillbewillwatchis2.If2.If从句从句 （一般现在时）主句（一般现在时）主句 （ 一般现在时一般现在时 ）表示科学常识、事实、表示科学常识、事实、 经常性的动作或倾向经常性的动作或倾向 自动会自动会发生的事发生的事 1. If water 1. If water 1. If water 1. If water is heatedis heate
10、dis heatedis heated, it , it , it , it turnsturnsturnsturns to steam. to steam. to steam. to steam. 2. If people 2. If people 2. If people 2. If people dont getdont getdont getdont get enough sleep, their thinking enough sleep, their thinking enough sleep, their thinking enough sleep, their thinking
11、 ability ability ability ability is reducedis reducedis reducedis reduced . . . .3. If I 3. If I 3. If I 3. If I needneedneedneed a haircut, I a haircut, I a haircut, I a haircut, I usuallyusuallyusuallyusually gogogogo to the barbers to the barbers to the barbers to the barbers near where I live.ne
12、ar where I live.near where I live.near where I live.4. People 4. People 4. People 4. People often often often often dont godont godont godont go out on Sundays if it out on Sundays if it out on Sundays if it out on Sundays if it rainsrainsrainsrains. . . .1. as ( so ) long as. “1. as ( so ) long as.
13、 “只要只要 ， 就就 ” ” 表示表示 一种前提条件一种前提条件Youll succeed Youll succeed Youll succeed Youll succeed as (so ) long as ( if only )as (so ) long as ( if only )as (so ) long as ( if only )as (so ) long as ( if only ) you you you you try hard.try hard.try hard.try hard.只要你努力，你就会成功。只要你努力，你就会成功。拓展：拓展：那么，除了那么，除了if之外，是
14、否之外，是否还有其他连词可以引导条件状语还有其他连词可以引导条件状语从句呢从句呢 2 2unlessunless除非；若不；如果不除非；若不；如果不；除非在除非在时候时候 1. You will fail to arrive there in time 1. You will fail to arrive there in time 1. You will fail to arrive there in time 1. You will fail to arrive there in time unless unless unless unless you start you start yo
15、u start you start earlierearlierearlierearlier如果你不早点动身，你就不能及时赶到那儿。如果你不早点动身，你就不能及时赶到那儿。 2. 2. 2. 2. UnlessUnlessUnlessUnless bad weather stops me bad weather stops me bad weather stops me bad weather stops me，I go for a walk every I go for a walk every I go for a walk every I go for a walk every morn
16、ingmorningmorningmorning除非天气不好，我每天早晨都要去散步。除非天气不好，我每天早晨都要去散步。 3. I wont loan you 3. I wont loan you 3. I wont loan you 3. I wont loan you unlessunlessunlessunless you are in extreme need of you are in extreme need of you are in extreme need of you are in extreme need of moneymoneymoneymoney若不是你急需用钱，我
17、不会借钱给你的。若不是你急需用钱，我不会借钱给你的。 中考真题：（2011安徽）1.Iftherain_(stop)tonight,wewillgotothecinema.（2012黑龙江）2.IllbuyacomputerifI_(have)enougmoney.（2013内蒙古）3.You_(notget)nervousifyou_(do)enoughexercise.（2014浙江）4.Ifshe_(be)kindtome,I_(notargue)withher.stopshavewontgetdoiswontargue分析试题特点及做题思路：分析试题特点及做题思路：1.考连词-做题思路
18、：分析句子-判断关系-选择正确的连词：1.Youwontgetnervous_youdoenoughexercise.A.if,B,unlessC,whether2._youhurryup,youwillmisstheearlybus.A.if,B,unlessC,whether分析试题特点及做题思路：分析试题特点及做题思路：2.Youmay_(pass)theexamifyou_(study)hard.2.考时态考时态-做题思路：做题思路：认字认字-判断语境提供的时态特点判断语境提供的时态特点-选择正确的时态选择正确的时态A.rain,stayB.rains,stayC.rains,will
19、stayD.rain,willstay1.IfIt_(rain)tomorrow,I_(stay)athome.A.pass,studyB.willpass,studyC.pass,willstudyD.passes,studyIfImill,_.IwillseeadoctorLookandsayIfImlate,_.Iwillsaysorry条件状语从句在日常生中的应用：条件状语从句在日常生中的应用：IfImhungry,Iwill_.IfIm tired,Iwill_.LookandsayeatsomefoodhavearestIfitrainstomorrow,I_.willwatchTVathomeIfit_tomorrow,_.Illplaybasketballdoesntrainif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；条件句表事实，条件句表事实，主句常用现在时。主句常用现在时。Summary（小结）Ifwestudyharder,wewilldowellintheexams,Tryourbesttostudyharder.Homework.Finishtheexercisesintheworkbook.
