This document provides rules and examples for using adjective clauses in sentences. It explains that adjective clauses function as adjectives but have verbs and nouns like sentences. It discusses using connecting words like "which" and "that" between a noun and adjective clause, and provides examples like "I just bought the book which you recommended." The document also notes a rule against using "that" to connect a proper noun in an adjective clause, like correctly saying "Winston Churchill, who was the prime minister..." rather than using "that."