Breakdown of Við borðum matinn á veitingastaðnum.
við
we
borða
to eat
maturinn
the food
á
onto / on / in (static location) / on (a day of the week)
Questions & Answers about Við borðum matinn á veitingastaðnum.
Why is the word for the restaurant spelled veitingastaðnum here?
What causes veitingastaðnum to be in the dative case in this sentence?
The preposition á (at/on) triggers it. When á is used to describe a fixed location (telling us exactly where the eating is happening), the noun that follows it must take the dative case.
Why is matinn (the food) not in the dative case too?
Matinn is the direct object of the sentence—it is the thing being eaten. The verb borða (to eat) requires its direct object to be in the accusative case. Since matur (food) is masculine, its accusative definite form is matinn. It is completely unaffected by the preposition á that comes later in the sentence.
How do compound words like veitingastaður change case?