Learn Danish: Bussen er forsinket på grund af vejarbejdet. - The bus is delayed because of the roadwork.

På grund af translates to "because of" and is a preposition. It must be followed by a noun or noun phrase, which here is vejarbejdet. If you wanted to use the conjunction fordi (because), you would need a full clause with a subject and a verb, such as: Bussen er forsinket, fordi der er vejarbejde (The bus is delayed because there is roadwork).

Can I use a full sentence after på grund af if I want to explain the roadwork?

Not directly. Because på grund af is a preposition, it cannot be followed directly by a full sentence. If you need to use a full clause with a subject and verb, you have to add at to make it på grund af at (due to the fact that). But when you just have a noun like vejarbejdet, på grund af is the correct choice.

Does the word forsinket change its ending depending on the subject?

Yes, because it acts as an adjective here describing the bus. Since bussen is an en word (common gender), forsinket keeps its basic form. If the subject were plural, like busserne (the buses), you would add an -e to make it Busserne er forsinkede.

Why does the sentence use vejarbejdet instead of just vejarbejde?