The document discusses various types of adverb clauses including clauses of time, place, reason, condition, and contrast. It provides examples of each type of clause and explains how they are used to modify verbs or entire sentences. Adverb clauses begin with subordinating conjunctions like because, if, when, where, and while and add details about time, place, reason, condition or contrast. Commas are sometimes needed to separate adverb clauses from main clauses.