This document provides information and examples about the use of prepositions in English. It discusses how prepositions are used to indicate location, direction, time, and purpose. Some common prepositions are listed. The document focuses specifically on the prepositions "in", "on", and "at" when used with locations and times, providing rules and examples to clarify the distinctions between these three prepositions in different contexts. It also addresses some tricky cases and briefly mentions phrasal verbs that involve prepositions. Multiple practice exercises are referenced for further developing skills with prepositions.