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Questions & Answers about Mökki on vuokrattu.
Is on vuokrattu a verb tense or an adjective here?
It is acting like an adjective that describes a state. While on vuokrattu is the exact same form used for the passive perfect tense (meaning "has been rented"), here it simply describes the current condition of the cabin: it is rented. This is called a resultative state.
How do we build the form vuokrattu?
It comes from the verb vuokrata (to rent). Since vuokrata is a type 4 verb, you form its passive past participle (the "done" form) by dropping the final -a and adding -tu. This gives us vuokrattu.
Does this mean the cabin is rented out to someone, or rented from someone?
It can mean either! The Finnish verb vuokrata covers both "to rent out" (like a landlord) and "to rent" (like a tenant). The sentence simply states the cabin's status is "rented", and you would rely on context to know who is who.