This document provides examples of using prepositions of time such as "on", "in", and "at" correctly with dates, days, times and seasons. It gives sentences to choose the right preposition for and blanks to fill in with the correct preposition. There are also exercises to sort words and phrases into categories of "on", "in", or "at" and fill in blanks with the appropriate preposition of time. The document aims to help practice and test understanding of using prepositions of time correctly in context.