Descriptive grammar is an attempt to give an account of what the current system is for either a society or an individual, whatever you happen to be studying.
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About Noam Chomsky
Noam Chomsky was a contemporary American linguist and activist. Avram Noam Chomsky is an American professor and public intellectual known for his work in linguistics, political activism, and social criticism. Sometimes called "the father of modern linguistics", Chomsky is also a major figure in analytic philosophy and one of the founders of the field of cognitive science. Read more on Wikipedia →