This document provides examples of how to use the prepositions "in", "on", and "at" in English. "In" is used for broader locations like countries, cities, vehicles, and publications. "On" refers to more specific surfaces and routes like streets, public transport, media, and communication. "At" is the most precise, used with addresses, specific points like bus stops, shops, events, work/study places, and positions on surfaces. The document offers many examples to illustrate the proper uses of these common English prepositions.