This document provides examples of using the prepositions "at", "on", and "in" to indicate time and place. It explains that "at" is used to indicate a specific time such as hours, "on" is used for days of the week or dates, and "in" is used for months, seasons, or years. Examples are given such as "at 7 o'clock", "on Monday", and "in January". The document also discusses using these prepositions to indicate place, with "in" used for cities or countries, "on" used for street names, and "at" used for street numbers or other specific locations. Practice sentences are included for learners to complete.