学习英语最初认识if引导的从句有两种:第一,if能引导宾语从句;第二,if还能引导条件状语从句。但许多同学对于if何时是引导宾语从句,何时引导条件状语从句仍然难于掌握和区别,请参照下列方法学习。一、从中文角度来正确区分两种从句1if引导宾语从句时中文意思为“是否”。如:Lilyaskediftheyweretooexpensive.(是否)Theshopkeeperaskedifshecouldhelpthem.(是否)Myuncleneverknewifhewasgoingtohaveaboy.(是否)Myparentsdidn'tknowiftheywouldhaveagrandson.(是否)2if引导条件状语从句时中文意思为“如果(假如)”。如:Ifyoudon'tlookfirst,acarmayhityou.(如果)Ifthetrafficismoving,youmustwait.(如果)Ifthepolicemansays“stop”,youmuststop.(假如)Ifyourideabiketoobigforyou,youwon'tbesafe.(假如)二、if引导的...