Kun uni keskeytyy, olen surullinen aamulla.

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Questions & Answers about Kun uni keskeytyy, olen surullinen aamulla.

Why is kun used here instead of jos?

kun means when and introduces a clause stating that something does happen (or habitually happens).
jos means if and makes the clause conditional (something might happen).
Using kun here tells us when sleep is interrupted (as a real or recurring event), not merely if it happens.

Is keskeytyy a passive form?

No. keskeytyy is the 3rd person singular present of the intransitive verb keskeytyä (“to get interrupted”).
• It means “it becomes interrupted” or “it gets cut off.”
• The true Finnish passive of keskeyttää (to interrupt) would be keskeytetään (“it is interrupted [by someone]”).

Could I say “when my sleep is interrupted”? How would that look?

Yes. You add the genitive plus a possessive suffix:
kun uneni keskeytyy
Here unen is the genitive of uni and -ni marks “my.”

Why is there no minä in olen surullinen?

Finnish verb endings show the subject:
-n on olen already means “I am.”
minä (I) is optional and used only for emphasis or contrast.

Why is surullinen in the nominative case?

After the verb olla (to be), predicate adjectives stay in the nominative to agree with the subject.
Since the subject is implicitly minä (I), surullinen is nominative singular.

What case is aamulla, and why is it used here?

aamulla is the adessive case (stem aamu- + -lla).
In Finnish, the adessive often expresses time at which something happens: “in/at the morning.”

Could I use aamuisin instead of aamulla?

Yes. aamuisin is an adverb of habitual time meaning “in the mornings” (regularly).
Example: Kun uni keskeytyy, olen surullinen aamuisin. (Whenever my sleep is interrupted, I am sad in the mornings.)