Le preposizioni di tempo, dove usare IN, AT e ON !!!
|Months: in January / in April||Clock times: at 7.30 a.m. / at 5 o’clock||Days of the week: on Monday|
|Seasons: in spring / in winter||Holiday periods: at Christmas, at Easter||Dates: on November 22nd|
|Years: in 1984 / in 2015||Exceptions: at night / at the weekend||Special days: on my birthday / on New Year’s Eve|
|Centuries: in the 20th century|
|Times of day: in the morning /in the evening|
|Longer periods of time: in the past / in the 1990s / in the holidays|