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Questions & Answers about Hún hefur áhyggjur af prófinu.
Why is it using hefur (has) instead of a form of vera (to be)?
Icelandic expresses this idea with the idiom að hafa áhyggjur (to have worries), so you say Hún hefur áhyggjur rather than using vera. Here hefur is simply the present tense of hafa; it is not a perfect tense because there is no past participle present. Literally it’s closer to English She has worries about the exam, but the natural translation is She is worried about the exam.
Why is áhyggjur plural?
The noun áhyggjur is practically used in the plural to mean worries/concerns. You will very often see it in set phrases like hafa áhyggjur, vera með áhyggjur, and engar áhyggjur! (no worries).
What case is áhyggjur in here?
It’s accusative plural as the direct object of hafa. For this noun class, nominative and accusative plural look the same (áhyggjur), which is why you don’t see a separate ending.
Why is the preposition af used and not um?
With áhyggjur, the idiomatic preposition is af: hafa áhyggjur af e-u (be worried about something). Using um here sounds non‑idiomatic. If you want a more explicit cause, you can also say vegna + genitive (due to) or út af + dative (because of), e.g., vegna prófsins, út af prófinu.