This document discusses prepositions and prepositional phrases. It begins with an overview of what prepositions are and how they connect objects to other parts of sentences. It then provides a list of common prepositions and tips for memorizing them. The document explains that a prepositional phrase consists of a preposition, any modifiers of the object, and the object. Examples are given. Potential errors with prepositional phrases are also discussed, such as mixing up subjects and objects. Throughout, examples are used to illustrate the key points about prepositions and prepositional phrases.