This document provides an overview of prepositions and prepositional phrases. It defines prepositions as words that connect nouns, pronouns, and phrases and indicate their relationship in terms of time, place, direction, etc. The document then discusses different types of prepositions including those for time (in, on, at), place (in, on, at), direction (to, toward, through, into), agent (by), and instrument (by, with). Examples are provided for each. It also defines prepositional phrases as groups of words consisting of a preposition and its object, functioning as adjectives or adverbs. Exercises are included for learners to practice identifying prepositions and prepositional phrases.