This document provides instructions on sentence diagramming, which is a method for visually representing the grammatical structure of sentences. It outlines 5 key skills for diagramming sentences: identifying the central parts of a sentence (subject, predicate, direct object, indirect object), establishing the relationships between those parts, showing those relationships with lines on a diagram, assigning modifiers like adjectives to the appropriate parts, and drawing the modifiers onto the diagram. Several examples of diagramming various types of sentences are provided to demonstrate applying these skills.