The document contains information about prepositions of time and place in Mongolian. It provides examples of how different prepositions are used to indicate time, such as "at", "on", "in", "from", "to", and examples of how prepositions are used to indicate place, such as "in", "on", "under", "behind", "next to". It also contains conversations that demonstrate the use of prepositions of time and place, such as asking where something is located or when an event will take place.