This document discusses different types of clauses: adjective clauses modify nouns and usually begin with a relative pronoun; adverb clauses provide more information about the main clause and begin with a subordinating conjunction; and noun clauses replace nouns in sentences and usually begin with "that" or a question word. Examples are provided for each type of clause to illustrate their structures and functions. Some words like "when" can be used to introduce different clause types depending on their role in the sentence.