AT / IN / ON (TIME EXPRESION)

• AT : - Horas : " at 6 o´clock"

                  -Fines de semana : "at the weekend"

                                               "at wekennds"

                  - Navidades :"at Cristmas"

                  - Semana santa : "at Easter"

                  - Momentos del dia : "at night", "at midnight", "at sunset"

• ON : - Días y fechas: "on monday", "on12th April", "on Christmas Day", " on my birthday"

• IN : - Partes del día : "in the morning", "in the afternoon", " in the evening"

                 - Estaciones : "in spring", "in summer", "in autumn", "in winter"

                 - Meses : " in October"

                 - Años : " in 1991"

                 - Décadas : " in the 60`s" / "in the 1960´s"

                 - Siglos : "in the 18th century"

                 - Edades historicas : "in the middle Ages, " in the Stone Age"