Question

What is the difference between prescriptive and descriptive grammar?

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Answer

Prescriptive grammar states how language should be used. Descriptive grammar records how it is used. They serve different purposes, and most public arguments about language treat one as the other.

Descriptive grammar is the scientific approach. A linguist describing English documents what speakers actually do, including constructions traditionally condemned — because if native speakers produce and understand something systematically, it is part of the language by definition.

On this view, there are no incorrect native constructions, only different varieties with different rules. "I ain't got none" is not a failure to follow English grammar; it follows a consistent grammar of a particular variety, with negative concord that also appears in French and Spanish and was standard in older English.

Prescriptive grammar sets a standard. Style guides, school teaching, editorial policy and usage manuals are prescriptive, and this is entirely legitimate — communities need shared conventions, formal registers exist, and consistency aids comprehension.

Where prescriptivism goes wrong:

Invented rules. Several famous prohibitions were never features of English — the bans on split infinitives and sentence-final prepositions were imported from Latin or asserted by individuals, and were always violated by the best writers.

Confusing formality with correctness. Informal usage is appropriate in informal contexts, not wrong.

Treating change as decay. Every generation believes the language is deteriorating, and this complaint is documented continuously for centuries. Languages change; they do not degrade.

Social prejudice dressed as grammar. This is the serious one. Judgements about "bad grammar" track social class, region and ethnicity far more than communicative effectiveness, and are frequently a socially acceptable proxy for prejudice about the speaker.

Where descriptivism is misapplied: as an argument that all usage is equally appropriate in all contexts, which linguists do not claim. Knowing that a variety is systematic does not mean it suits a job application.

Both perspectives are compatible — describe accurately, prescribe for a purpose, and be honest about which you are doing.

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