Breakdown of Bussi viivästyi, koska oli ollut ruuhka.
olla
to be
koska
because
bussi
bus
viivästyä
to be delayed
Questions & Answers about Bussi viivästyi, koska oli ollut ruuhka.
What makes oli ollut a pluperfect tense?
The pluperfect is made by combining the past tense of the helper verb olla with the NUT/NYT participle of the main verb. Here, both verbs are olla! So we use oli (it was) plus ollut (been) to mean 'had been'.
Why do we need the pluperfect here instead of just saying oli ruuhka?
The pluperfect shows that one past event happened before another past event. The traffic jam happened first (oli ollut), which then caused the bus to be delayed (viivästyi).
Why is the word order oli ollut ruuhka instead of ruuhka oli ollut?
This is an existential sentence, which states that something exists or happens (like English sentences starting with 'there is'). In Finnish, these usually start with the verb and put the new information (the subject, ruuhka) at the end. It translates naturally to 'there had been a traffic jam'.
Why is the verb viivästyi used instead of viivästi?
Viivästyä is an intransitive verb, meaning something gets delayed on its own without taking a direct object. Viivästää is transitive and means to delay something else. Since the bus is the thing getting delayed, we use the intransitive past tense viivästyi.