Breakdown of I fredags fann vi det nödvändigt att ändra kriteriet.
det
it (neuter)
vi
we
att
to
ändra
to change (alter, modify)
Questions & Answers about I fredags fann vi det nödvändigt att ändra kriteriet.
Why do we need the word det here?
Here, det acts as a formal object. It is a placeholder for the actual, longer object of the sentence, which is the infinitive phrase att ändra kriteriet. Just like in English, Swedish uses det to introduce the evaluation (nödvändigt) before revealing the actual action being evaluated.
Why does nödvändig get a -t at the end to become nödvändigt?
Adjectives must agree with the noun or pronoun they describe. Here, the adjective describes the placeholder pronoun det, which counts as a neuter word. Therefore, you must add a -t to make it nödvändigt.
Why does the verb fann come before the subject vi?
This is because of the V2 rule. The sentence starts with the time expression I fredags, which occupies the first position. The verb must always take the second position in a main clause, so fann comes next, pushing the subject vi to the third position.
How does the phrase i fredags work to mean last Friday?
In Swedish, placing i before a day of the week and adding an -s to the end of the day is the standard way to talk about a day in the recent past. So i fredags specifically means last Friday.