In linguistics, grammar is the set of structural rules that
governs the composition of clauses, phrases, and words in any given natural
language. The term refers also to the study of such rules, and this field
includes morphology, syntax, and phonology, often complemented by phonetics,
semantics, and pragmatics. Linguists do not normally use the term to refer to
orthographical rules, although usage books and style guides that call
themselves grammars may also refer to spelling and punctuation.
