This document discusses subordination and subordinate clauses. It defines subordination as a grammatical strategy to show that one idea is more important than another in a sentence. Subordinate clauses are dependent clauses that cannot stand alone, while independent clauses can. The document provides examples of subordinate clauses using conjunctions like "although" and "before." It also discusses the different types of subordinate clauses, such as adjective and adverb clauses, and lists common subordinating conjunctions used to connect dependent and independent clauses.