Solution:(a) True: Every natural language has a grammar, as grammar is the set of rules governing how sentences are formed in any language.
(b) True: A dialect is essentially a form of a language that includes specific vocabulary, pronunciation, and grammar, often influenced by region or social factors.
(c) False: There are cases where dead languages have been revived, such as Hebrew, which was revitalized as a spoken language in modern Israel.
(d) False: Many people are capable of learning multiple languages beyond two,
as evidenced by polyglots around the world.
(e) False: Not all languages have a writing system; some languages are purely spoken.