This document discusses different types of sentences including declarative sentences which make statements, interrogative sentences which ask questions, and imperative sentences which are commands or requests. It provides examples of each type of sentence such as "I am handsome" for declarative, "Am I handsome?" for interrogative, and "Hand me the mirror" for an imperative command versus "Please, hand me the mirror" for an imperative request. The document stresses not confusing sentence function, which was the topic discussed, with sentence structure, which will be covered in a future lesson.