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中考复习知识点之条件状语从句


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    条件状语从句
    (1)条件状语从句通常由 if ,unless引导。例如:
    What shall we do if it snows tomorrow?
    Don't leave the building unless I tell you to.
    (2)在条件状语从句里,谓语动词通常用现在时态表示将来的动作或状态。例如:
    I'll help you with your English if I   am free tomorrow.
    He won't be late unless he is ill.
    (3)祈使句+and(or)+陈述句在意思上相当于一个带有条件状语从句的复合句。例如:
    Hurry up, or you'll be late.
    =lf you don't hurry up, you'll be late.
    Study hard and you will pass the exam.
    =If you study hard, you will pass the exam.
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