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Grammaticalité

In linguistics, grammaticality is determined by the conformity to language usage as derived by the grammar of a particular speech variety. The notion of grammaticality rose alongside the theory of generative grammar, the goal of which is to formulate rules that define well-formed, grammatical, sentences. These rules of grammaticality also provide explanations of ill-formed, ungrammatical sentences. In theoretical linguistics, a speaker's judgement on the well-formedness of a linguistic 'string'—called a grammaticality judgement—is based on whether the sentence is interpreted in accordance with the rules and constraints of the relevant grammar. If the rules and constraints of the particular lect are followed, then the sentence is judged to be grammatical. In contrast, an ungrammatical sentence is one that violates the rules of the given language variety. Linguists use grammaticality judgements to investigate the syntactic structure of sentences. Generative linguists are largely of the opinion that for native speakers of natural languages, grammaticality is a matter of linguistic intuition, and reflects the innate linguistic competence of speakers. Therefore, generative linguists attempt to predict grammaticality judgements exhaustively. Grammaticality judgements are largely based on an individual's linguistic intuition, and it has been pointed out that humans have the ability to understand as well as produce an infinitely large number of new sentences that have never been seen before. This allows us to accurately judge a sentence as grammatical or ungrammatical, even if it is a completely novel sentence. According to Chomsky, a speaker's grammaticality judgement is based on two factors: A native speaker's linguistic competence, which is the knowledge that they have of their language, allows them to easily judge whether a sentence is grammatical or ungrammatical based on intuitive introspection. For this reason, such judgements are sometimes called introspective grammaticality judgements. The context in which the sentence was uttered.

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Syntactic Structures
Syntactic Structures is an important work in linguistics by American linguist Noam Chomsky, originally published in 1957. A short monograph of about a hundred pages, it is recognized as one of the most significant and influential linguistic studies of the 20th century. It contains the now-famous sentence "Colorless green ideas sleep furiously", which Chomsky offered as an example of a grammatically correct sentence that has no discernible meaning, thus arguing for the independence of syntax (the study of sentence structures) from semantics (the study of meaning).
Théorie de l'optimalité
En linguistique, la théorie de l'optimalité (OT) est un modèle linguistique qui postule que l'ordonnancement de contraintes universelles est responsable de la réalisation des formes d'une langue, que ce soit phonologiquement ou autrement. Cette théorie se distingue d'autres théories phonologiques parce qu'elle utilise des contraintes au lieu de recourir à des règles. Selon cette théorie, la grammaire est un système qui transforme un input donné en output optimal pour la langue.
Linguistic performance
The term linguistic performance was used by Noam Chomsky in 1960 to describe "the actual use of language in concrete situations". It is used to describe both the production, sometimes called parole, as well as the comprehension of language. Performance is defined in opposition to "competence"; the latter describes the mental knowledge that a speaker or listener has of language. Part of the motivation for the distinction between performance and competence comes from speech errors: despite having a perfect understanding of the correct forms, a speaker of a language may unintentionally produce incorrect forms.
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