Prepositions are one of the toughest elements in a foreign language, and this is not an exception in English. This is because the use of prepositions is very instinctive in a linguistic fashion; unfortunately, English is not our mother tongue, so we need to learn some rules. In this post we will focus on some basic prepositions used to express when actions are made.
We use in when we refer to months (in January, in September), seasons (in summer, in winter), years (in 1492, in 1991), centuries (in the 15th century), times of the day (in the morning, in the evening) excepting night (at night), and lastly longer periods of time (in the past, in the 80s, in the holidays).
We use on when we refer to days of the week (on Wednesday, on Friday), days + parts of days (on Thursday afternoon), dates (on March 7th), and special days (on my birthday, on Christmas Day).
We use at when we refer to clock times (at half past six) and festivals (at Easter, at Christmas). We also use at for some exceptions such as at night (we have already seen that one above), at the weekend, and at lunchtime / at dinnertime / at breakfast time.