This paper,based on construction grammar and mental space theory,gives a cognitive analysis of the predicative conditionals,trying to explore the form-meaning relations and the alternativity of mental spaces in the predicative conditionals.%以构式语法和心理空间理论为依据，对英语中可预测性条件句进行语言的认知分析，探讨可预测性条件结构的形式—意义关系及其心理空间的可选择性。
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