Breakdown of Um helgar förum við stundum á safn í borginni.
Questions & Answers about Um helgar förum við stundum á safn í borginni.
In this sentence um helgar is a fixed time expression meaning on weekends / at weekends in general.
Literally:
- um = around, about, during
- helgar = weekends (accusative plural of helgi, weekend)
So um helgar is literally during weekends / around weekends, and it is understood as on weekends (as a habit, not just one specific weekend).
Compare:
- um helgina – during the (coming/last/this) weekend, one specific weekend (accusative singular)
- um helgar – on weekends in general, a repeated action
You would not normally say á helgi here.