This document discusses prepositions and prepositional phrases. It begins by defining prepositions as words that describe relationships between parts of speech according to their function or use in a sentence. Examples of common prepositions relating to place, position, date, duration, or time are provided. The document then explains how prepositional phrases are formed with a preposition followed by a noun, pronoun, gerund, or clause. It provides examples of simple and complex prepositional phrases. Finally, it discusses the functions of prepositional phrases as adjectives or adverbs in a sentence and provides examples.