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In page Universal grammar:

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The modern conception of universal grammar is generally attributed to Noam Chomsky. However, similar ideas are found in older work. A related idea is found in Roger Bacon's c. 1245 Overview of Grammar and c. 1268 Greek Grammar, where he postulates that all languages are built upon a common grammar, even though it may undergo incidental variations. In the 13th century, the speculative grammarians postulated universal rules underlying all grammars.[citation needed]