Questions & Answers about Eftir ferðina fórum við í íþróttahúsið að horfa á fótbolta.
Because Icelandic usually follows a verb-second pattern in main clauses.
That means:
- one element comes first,
- then the finite verb comes second.
Here, Eftir ferðina is placed first for emphasis or to set the time frame, so the verb fórum has to come next, and the subject við comes after it.
So:
- Við fórum ... = neutral starting point
- Eftir ferðina fórum við ... = After the trip, we went ...
Both can be possible, but the sentence you have is a very normal Icelandic structure.
Because ferðina is:
- the noun ferð = trip/journey
- in the accusative singular
- with the definite article attached, so it means the trip
The preposition eftir here takes the accusative, so you need ferðina, not nominative ferðin.
A quick comparison:
- ferðin = the trip as a subject
- ferðina = the trip after a preposition or as an object in accusative contexts