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,引导的条件,状语从句,,,,一,、定义,二,、具体用法,三,、练习,四,、拓展,五、总结,,目录：,,,,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 ）,一、什么是条件状语从句？,位置,：,从句可放在主句之前或之后，但是放在主句之前须有逗号隔开,,eg:,如果我有足够的钱，我就去环游世界,,,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.,从句,主句,二、条件,状语,从句的用法,If I,get up,late, I,will be,late for school.,If I,don’t finish,my homework, I,won’t go,to bed.,If you,join,the band(,乐队,), you,will be,famous.,,Let’s look at some sentences first···,用法,1,：,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,主将从现”的原则构 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.,用法,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,You,must stop if the traffic is red,.,,,如果是红灯，你必需停下来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，你必须少吃面包用法,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.,如果没有完成家庭作业，就不要去踢足球Please call me if he comes next Sunday.,如果他下周日来的话，请打给我。
用法,4,：,,表示科学常识、事实、 经常性的动作或倾向 自动会发生的,事,If,从句 （一般现在时），主句 （ 一般现在时 ）1.If water,is heated,, it,turns,to steam.,如果水加热，就会蒸发2. If people,don’t get,enough sleep, their thinking ability,is reduced,.,如果人们睡眠不足，他们的思维能力就会下降3. If I,need,a haircut, I,usually,,go,to the barber’s near my house.,如果我要剪头发，我通常是去附近那一家理发店4. People,often,don’t go,out on Sundays if it,rains,.,如果周日下雨的话，人们一般不出门三、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, she’ll 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 won’t 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.,don’t eat,will get,tell,won’t,believe,,doesn’t 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,doesn’t rain,will go,will play,sunny,becomes,will be,will watch,is,四、拓展,除了,if,之外，是否还有其他连词可以引导条件状语从句呢？,,最常见的还有：,so/as long as···,只要,,unless,除非，若不,1. as ( so ) long as…. “,只要,…,， 就,… ”,表示 一种前提条件,You’ll succeed,as (so ) long as ( if only ),you try hard.,只要你努力，你就会成功。
As long as you are happy, it doesn’t matter what you do.,只要你高兴，你做什么都没有关系,,You may borrow my books as long as you keep it clean.,只要你保持书的清洁，你就可以借我的书2,．,unless,．,除非；若不；如果不,……,；除非在,……,时候,,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I won‘t 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,won’t get,do,is,won’t 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 won’t 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.You may ______ (pass) the exam,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 I’m ill,,__________________.,,,,I will see a doctor,Look and say,If I’m late,,_________________.,I will say sorry,条件状语从句在日常生中的应用：,,If I’m hungry,,I will,______________.,If I’m,,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,,________________.,,I’ll play basketball,doesn’t 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， 主句常用现在时五、,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.,,Thank you !,。