This document provides instruction on sentence diagramming, including identifying the key parts of a sentence, establishing relationships between parts, showing relationships with diagram lines, assigning modifiers to parts, and practicing diagramming sample sentences. The goal of diagramming is to represent the grammatical structure and meaning of sentences visually. Key parts to identify are subjects, predicates, direct objects, and sometimes indirect objects. Modifiers like adjectives and adverbs are also added to the diagrams.