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由if引导的条件状语从句一、含义在句子中作条件状语的从句称为条件状语从句。引导条件状语从句的连接词有if(如果),unless(除非,如果不)等,在这里只学习由if引导的条件状语从句。二、用法由if引导的条件状语从句的主句和从句的时态搭配一般有下面三种情况:例如:Wewillgototheparkifit______(be)sunnytomorrow.例如:Don’twaitformeifI_____(be)late.3.if条件状语从句中,如果主句有must,can,may等情态动词,从句用___________。1.CallmeifTina______(willcome/comes).2.Ifit____(be)coldtomorrow,Iwillwearmysweater.()1.Ifwe________takeenvironmentalproblemsseriously,theearth________worseandworse.A.don't;willbeB.won't;isn'tC.won't;isD.don't;won'tbe()2.—Whatareyougoingtodotomorrow?—We'llgotothelibrarytomorrowifit________.A.isn'trainB.rainC.won'trainD.doesn'train()3.I'mnotgoingtotomorrow'sparty________I'minvited.A.ifB.UnlessC.when用法小结