This document provides information about noun clauses. It defines a noun clause as a dependent clause that behaves as a noun or noun phrase. A noun clause is introduced by a noun clause word such as a question word, whether, if, or that, and contains a subject and verb. The document provides examples of different types of noun clauses, including subject, object, and complement noun clauses. It also discusses omitting the word "that" in certain noun clauses without changing the meaning.