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本文从主、从句间情境发生的时间关系入手，探讨了If从句表示将来含义时，谓语动词何时用一般现在时，何时选择Will结构。文中首先将条件句分为时联性条件句和无时联性条件句两类．然后重点探讨时联性条件句，认为时联性虽件句可分为纯时联性条件句和非纳时联性条件句；在纳时联性条件句中，If从句中的调语动词用一般现在时；在非纯时联性条件句中，If从句中的渭语动词选择Will结构。文章还用测检法验证了If从句句法功能上的差异。
This paper starts from the temporal relationship between the situations of the main and the subordinate clauses and explores when the If clause expresses the future meanings and when the predicate verbs use the general present and when the Will structure is chosen. First of all, the article divides the conditional sentence into two categories: the time-tied conditional sentence and the non-time-linked conditional sentence. Then we focus on the time-coupled conditional sentences, and consider that the time-coupled sentences can be divided into purely time-dependent and non-satisfied-time conditional sentences. Use the present tense; in the non-purely time conditional conjunction, the Weaver verb in the If clause selects the Will structure. The article also uses test method to verify the functional difference of If clause syntax.