Question

grammer yo oiauyfoygu

Answer 1

In formal language theory, a context-free grammar is a formal grammar whose production rules are of the form A\ \to \ \alpha with A a single nonterminal symbol, and \alpha a string of terminals and/or nonterminals

Answer 2

Answer:

Grammar is a set of implicit rules that govern the formation of sentences. ... Usage is a set of explicit prescriptive rules that people impose on language in order to separate socially acceptable grammatical sentences from others that are not socially acceptable.