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1、If引导的条件状语从句引导的条件状语从句1语法：语法：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
2、为：if引导的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：2If itrainstomorrow,Iwillstayathome.Ifyouarehard-working,yourparentsmayfeelhappy.Studyhard,if shewantstogetgoodgrades.主将从现，主情从现主祈从现，3If 在宾语从句中翻译为在宾语从句中翻译为“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”I
3、ll 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42. 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 out tomorrow if it doesnt rain.I dont
4、know if the train has arrived.51. 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 good results .63. 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
5、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7-Sam,doyouknowifAlice_tomypartynextweek?-Ithinkshewillcomeifshe_free.Acomes;isBwillcome;willbeCwillcome;isDcomes;willbe
6、81 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 bus .4 be quick, please, or you will be late for school._you _quick, you will be late for school.91.Ifyou_tothe
7、party,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.willgoAD10
