Aamulla huomasin, että huoltomies oli korjannut johdon yön aikana.

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Questions & Answers about Aamulla huomasin, että huoltomies oli korjannut johdon yön aikana.

What case is aamulla and what does it mean here?
It’s the adessive case (stem aamu + suffix -lla), used as a temporal adverbial meaning “in the morning.”
Why is there a comma before että?
Finnish grammar requires a comma before subordinate conjunctions like että to separate the main clause (Aamulla huomasin) from the subordinate clause.
What function does että serve in this sentence?
että is a subordinating conjunction meaning “that.” It introduces the content clause huoltomies oli korjannut johdon yön aikana.
Why is oli korjannut in the pluskvamperfekti rather than the perfect tense?
Pluskvamperfekti (oli korjannut) indicates an action completed before another past action (the noticing in the morning). The perfect tense (on korjannut) would link the repair to the present, which doesn’t match the timeline here.
Why is the subject pronoun omitted in oli korjannut?
Finnish verbs encode the subject in their endings. Oli (3rd sg. past of olla) + -nut (past participle) already signals “he/she/it,” so the pronoun hän is dropped.
Why is there no article before johto, and what case is johdon?
Finnish has no articles (a/an, the). Johdon is the genitive singular of johto, here marking a specific direct object in a completed action (functionally “the cable”).
What does yön aikana mean, and how does it differ from yöllä?
Yön aikana literally means “during the night,” focusing on the duration. Yöllä (adessive of ) means “at night” more generally, without emphasising the time span.