Questions & Answers about Við borðum brauð með osti í hádeginu.
Because borðum is the 1st person plural present-tense form of the verb að borða (to eat).
The present-tense forms are:
- ég borða — I eat
- þú borðar — you eat
- hann/hún/það borðar — he/she/it eats
- við borðum — we eat
- þið borðið — you all eat
- þeir/þær/þau borða — they eat
So við borðum means we eat.
Brauð is the direct object of the verb borðum, so it is in the accusative case.
However, brauð is a neuter noun, and in this noun the nominative and accusative singular look the same. So even though it is accusative here, the form is still brauð.
That is very common in Icelandic, especially with many neuter nouns.