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This article discusses currently unsolved problems in linguistics. Some of the issues below are commonly recognized as unsolved problems; i.e. it is generally agreed that no solution is known. Others may be described as controversies; i.e. although there is no common agreement about the answer, there are established schools of thought that believe they have a correct answer. ==Concepts== * Is there a universal definition of ''word''? * Is there a universal definition of ''sentence''? * Are there any universal grammatical categories? * Can the elements contained in words (morphemes) and the elements contained in sentences (syntactic constituents) be shown to follow the same principles? * How are domains for phonological processes related to syntactic structure? Do prosodic domains deviate from syntactic constituent structure? * Is it possible to formally delineate languages from each other? That is to say, is it possible to use linguistic (rather than social) criteria to draw a clear boundary between two closely related languages with a dialect continuum between their respective standard forms (e.g. Occitan and Catalan)? * How does grammaticalization function? * What constitutes grammatically correct language, as viewed by native speakers of that particular language, i.e. the problem of gradient well-formedness)? * How do creole languages emerge? * How does lexical substitution function given the potentially limitless number of different contexts, the limits of one's knowledge and the limits of one's understanding and usage of language? * How do idiolects and dialects emerge? Are there any common patterns in their development? Can they be quantitatively and qualitatively measured at all and if yes, how? 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of unsolved problems in linguistics」の詳細全文を読む スポンサード リンク
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