The document discusses various linguistic concepts related to grammar. It begins by defining grammar in both the broad and narrow sense. In the broad sense, grammar includes all aspects of language like morphology, syntax, semantics etc. In the narrow sense, grammar refers specifically to word formation and sentence structure.
It then contrasts prescriptive grammar, which provides normative rules, with descriptive grammar, which objectively describes language as used. There is disagreement between these approaches on sentences like "I don't know nothing".
The document also discusses key grammatical units like phrases, clauses, and morphemes. It explains differences between concepts like stems, roots, affixes and allomorphs. Finally, it outlines different types