This document discusses different types of "that clauses" in sentences. It explains that the sentences provided contain subordinate clauses introduced by the conjunction "that", and these can be noun clauses, adjective clauses, or adverb clauses depending on their function. It provides guidelines for identifying each type of clause: noun clauses function as the object of a verb or can stand alone as an answer to a question, adjective clauses modify a noun, and adverb clauses modify a verb, adjective, or other adverb by adding details about time, place, manner, etc. Examples are given to illustrate each type of clause. The document encourages further study of grammar usage and functions.