一般认为，反事实条件句是前件为假的条件句，但前件为假有两种情况，一种是客观事实上是假的，另一种是主观认定是假的（而客观事实是真的）。反事实条件句是重要的，因为它涉及逻辑学的核心问题———推理，历史上人们尝试用各种不同的方法来刻画它，这些方法大致来自三个方面的：语形的、语义的和语用的，本文主要从语义学的角度综述了反事实条件句理论的发展。反事实条件句语义学理论的发展经历了从传统的静态语义学向现代的动态语义学的发展。%Counterfactual conditionals are often thought to be those with false antecedents, which usually occurs in two primary scenarios: one happens when it is false objectively, the other happens when it is subjectively identified false ( though actually real ) .The importance of counterfactual conditionals lies in their involvement with infer-ence, the heart of logistics.To describe counterfactual conditionals, people in the history try to use different ways, which can be concluded as the syntactic way, semantic way as well as the pragmatical way.From the semantic per-spective, this paper gives a good overview of the development of the counterfactual conditionals, which go though the progress from traditional static semantics to modern dynamic semantics.
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