This document discusses different types of clauses, including independent clauses, dependent clauses, and noun clauses. It notes that a clause contains a subject and verb, and an independent clause forms a complete sentence while a dependent clause does not. A noun clause functions like a noun and can be the subject or object of a sentence. The document provides examples of different types of noun clauses, including those beginning with question words like what, who, when, and whether or if. It also discusses noun clauses introduced by the word "that".