Koman er sein af því að hraðlestin er biluð.
The arrival is late because the express train is broken.
Breakdown of Koman er sein af því að hraðlestin er biluð.
vera
to be
af því að
because
bilaður
broken
seinn
late (adjective) / slow
Questions & Answers about Koman er sein af því að hraðlestin er biluð.
Why do we use er biluð here instead of hefur bilað?
This sentence perfectly demonstrates the resultative aspect you are learning. We use vera (to be) plus an inflected past participle (er biluð) to focus on the current state: the train is currently broken. If we used hafa (to have) plus the supine form (hefur bilað), the focus would be on the action itself: the train broke down at some point in the past.
Why does the past participle biluð end in -uð?
When a past participle is used with vera to describe a result or state, it acts like an adjective and must agree with the subject in gender, number, and case. The subject here is hraðlestin (the express train), which is a feminine, singular, nominative noun. Therefore, the past participle of bila takes the feminine singular ending, becoming biluð.
How is the compound word hraðlestin built?
It combines the prefix hrað-, which comes from the adjective hraður (fast), and lestin, which is the definite form of the feminine noun lest (train). Because the core noun lest is feminine, the entire compound word hraðlest is also feminine, which is why we use the feminine adjective sein and feminine participle biluð in this sentence.
Could I just say því instead of af því að for "because"?