Questions & Answers about Við göngum upp að húsinu.
Because göngum is the 1st person plural present tense form of the verb að ganga (to walk).
- að ganga = the infinitive, like English to walk
- ég geng = I walk
- við göngum = we walk
So the subject við (we) requires the verb form göngum.
This is a common pattern in Icelandic: the verb changes depending on the subject.
Við means we.
It is the 1st person plural pronoun. In this sentence:
- Við = we
- göngum = walk / are walking
So Við göngum means we walk or we are walking, depending on context.
Icelandic often includes the subject pronoun clearly, especially in simple learner-style sentences like this one.