This document discusses the four main types of sentences: declarative, interrogative, imperative, and exclamatory. It provides examples of each sentence type and notes their distinguishing features. Declarative sentences make statements and end with a period, interrogative sentences ask questions and end with a question mark, imperative sentences give commands or requests and end with a period or exclamation mark, and exclamatory sentences express strong emotion and end with an exclamation mark. The document also gives examples of different types of interrogative sentences and provides practice identifying sentence types.