This document provides examples of common prepositions of time used in the English language, along with the correct preposition for each time-related context. It lists over 20 examples of sentences using prepositions like "at", "in", "on", "by", "from", "until", "since", "ago", and others followed by the appropriate preposition for that context. The purpose is to illustrate the various ways prepositions are used to indicate time in the English language.