On, at, in, since, for, during, within... what do all of these words have in common? They are prepositions and they are all prepositions that are included on this hand-out. This handout breaks down prepositions used when talking about time with two clear charts that cover prepositions expressing one point in time and prepositions expressing extended time. Using the chart, writers can practice these prepositions in a short fill-in-the-blank exercise.