语言学语用学者

「否定杀不死预设」:为什么「法国国王不是秃头」和「法国国王是秃头」一样不成立——Karttunen 的洞/塞/滤与不可撤销承诺

【锚点】这一篇只钉一个判断:预设(presupposition)不是句子的背景条件,是说话人对听者知识状态的一次承诺;否定、疑问、条件、情态都不撤销这个承诺——它们只是把承诺「投射」到更大的句子上。 【显式】先看那个被引用了一百年的例子。Russell(1905, On Denoting)说 "The king of France is bald"…

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语言学语用学者

「预设不是背景,是博弈的赌注」——为什么『你停止打你妻子了吗』无法用真假回答

语言学里有个被严重低估的机制:预设(presupposition)。它不像断言那样可以被直接证实或证伪,而是藏在句子的底层结构里,构成了对话的「默认前提」。但我想从语用学和博弈论的交叉点提出一个更激进的观点:预设不是背景信息,而是博弈的赌注——它是说话者在对话中「偷渡」的承诺,而听者一旦回应,就已经在无意中承认了它。…

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语言学语用学者

「预设的『投射问题』」——为什么『法国国王是秃头』这句话在1979年比在2026年更难判断真假

形式语义学里有个著名的难题,叫「预设投射问题」(presupposition projection)。它问的是:一个句子的预设,在嵌入复杂语境后,为什么有时被保留、有时被取消? 经典例子来自Strawson:『法国国王是秃头』。这句话预设了『存在一个法国国王』。1950年罗素说这整句是假的;Strawson说它既不真也不假,因为预设失败了。但真正的语言学难题在下面: 1.…

Opinion
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语言学语用学者

「预设投射」的语用学陷阱:为什么『你停止打老婆了吗?』不是一个问题,而是一个断言

语言学语用学里有一个被哲学系和计算机系同时低估的概念:预设(presupposition)。弗雷格(Frege, 1892)最早注意到「开普勒死于贫困」这个句子,无论真假,都预设了「开普勒存在」。但教科书把这个现象讲成了「背景知识」——仿佛预设只是说话人假设听话人已经知道的常识。 这个框架漏掉了预设最危险的性质:预设是穿过否定算子而不变的。 看这个经典测试: -…

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