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1、If引导的条件状语从句引导的条件状语从句例句例句：If people obey the traffic rules, there will be fewer accidents. if引导的条件状语从句引导的条件状语从句if:从属连词，意思是：从属连词，意思是：“如果，假如，倘若如果，假如，倘若”从句从句主句主句There There willwill be fewer accidents be fewer accidents if if people obey the traffic rules.people obey the traffic rules. 原句可改为：原句可改为：if引导的
2、条件状语从句既可以放在句子前，引导的条件状语从句既可以放在句子前，也可以放在句子后。也可以放在句子后。 从句位于主句之前时，常用逗号将其与主句隔开从句位于主句之前时，常用逗号将其与主句隔开。 结构结构：If itrainstomorrow,Iwillstayathome.Ifyouarehard-working,yourparentsmayfeelhappy.Studyhard,if shewantstogetgoodgrades.主将从现，主情从现主祈从现，if 引导的条件状语从句和引导的条件状语从句和if 引导的引导的宾语从句的区分宾语从句的区分:If 在宾语从句中翻译为在宾语从句中翻译为
3、“是否是否”If 在条件状语从句中翻译为在条件状语从句中翻译为“如果如果”Ill go to see you if I am free next week. I want to know if he is a teacher.whether1. if 在句中的含义不同在句中的含义不同2. if 在从句中的位置不同在从句中的位置不同If 引导的宾语从句放在主句之后；而引导的宾语从句放在主句之后；而if引引导的状语从句可放在主句之前也可放在主导的状语从句可放在主句之前也可放在主句之后句之后= If it doesnt rain, I will go out tomorrow.I will go o
4、ut tomorrow if it doesnt rain.I dont know if the train has arrived.找出下列句子中哪些是找出下列句子中哪些是if条件状语从句，条件状语从句，哪些是哪些是if宾语从句宾语从句1. Can you tell me if she can come to the meeting ?2. She will not go there if it is rainy tomorrow.3. I cant guess if she will be angry .4. If we help each other , we both will get
5、 good results .3. 时态要求上有区别：口诀时态要求上有区别：口诀If 引导条件状语从句的时态为一般现在时引导条件状语从句的时态为一般现在时 记住记住“主将从现主将从现” 1.I want to know if there a sports meeting next month.doesnt rainwill be2.If it , well hold it.If 引导的宾语从句的时态由主句及本身时引导的宾语从句的时态由主句及本身时态决定；态决定；If是否，一般将来；是否，一般将来；if如果，一般现在如果，一般现在-Sam,doyouknowifAlice_tomypartyne
6、xtweek?-Ithinkshewillcomeifshe_free.Acomes;isBwillcome;willbeCwillcome;isDcomes;willbeIf 引导的条件状语从句的练习引导的条件状语从句的练习1 we dont know if it _tomorrow, if it _,we wont go hiking.(snow)2The sense of happiness will increase if you _ what you like to do.(do)3 If she _(not get ) up early , shell miss the early
7、 bus .4 be quick, please, or you will be late for school._you _quick, you will be late for school.1.Ifyou_totheparty,youllhaveagreattime.A.willgoB.wentC.goD.going2I_hertheanswerifshe_me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asksCD3.Whatareyougoingtodotomorrow?-Wellgotothelibrarytomorrowifit_.A.isntrainB.rainC.wontrainD.doesntrain4.Whatwillyoudoifyou_totheoldfolkshomevisit?A.goB.wentC.goingD.willgoAD
