المفردات موضوعة بحسب الشخص فالمركبات موضوعة بحسب النوع
Individual words are assigned according to their particular forms, while constructions are established through general patterns.
The point is not that every possible complete sentence was assigned a separate conventional name. Grammatical structures, such as subject–predicate or verb–subject combinations, enable speakers to produce indefinitely many meaningful sentences by a rule.
A newly formed sentence need not have been individually pronounced before to be legitimate. Yet grammatical composability and the interpretation of a figurative communicative use remain distinct questions. The latter requires attention to the original use, intended use, and relevant relation.