grammar mistake

In applied linguistics, an error is an unintended deviation from the immanent rules of a language variety made by a second language learner. Such errors result from the learner's lack of knowledge of the correct rules of the target language variety. A significant distinction is generally made between errors (systematic deviations) and mistakes (speech performance errors) which are not treated the same from a linguistic viewpoint. The study of learners' errors has been the main area of investigation by linguists in the history of second-language acquisition research.In prescriptivist contexts, the terms "error" and "mistake" are also used to describe usages that are considered non-standard or otherwise discouraged normatively. Such usages, however, would not be considered true errors by the majority of linguistic scholars. Modern linguistics generally does not make such judgments about regularly occurring native speech, rejecting the idea of linguistic correctness as scientifically untenable, or at least approaching the concept of correct usage in relative terms. Social perceptions and value claims about different speech varieties, although common socially, are not normally supported by linguistics.

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