有关if的从句的所有用法

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有关if的从句的所有用法

1.if 可引导状语从句 如果...,假使...a. [就现在,过去,未来可能实现之事加以推测时]If you are tired, we will go straight home 如果你疲倦了,我们就直接回家If you have finished reading this book, please retur...