Relacionar Columnas The period-Level 2Versión en línea Une la definición con su ejemplo. por Dani Mendez 1 Use periods at the end of every declarative and imperative sentences. 2 Use periods after initials of names and after abbreviated tittles of respect. 3 Use periods after abbreviations of days of the week and months of the year. Dr. Thomas Johnson Wed. Michael is eating a red apple.