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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,：,博习教育,:,2015.12.27,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,（一）主将从现,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,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.,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：,用法,（二）：,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,.,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,unless,除非；如果不,；,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。,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)enough money.,（,2013,内蒙古,）,3.You _(not get)nervous if you _(do)enough exercise.,stops,have,wont get,do,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,）,Thanks for listening.,Goodbye.,再见,
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