Viikinki lienee ollut rohkea tutkimusmatkailija.

Breakdown of Viikinki lienee ollut rohkea tutkimusmatkailija.

olla
to be
rohkea
brave
tutkimusmatkailija
the explorer
viikinki
the Viking

Questions & Answers about Viikinki lienee ollut rohkea tutkimusmatkailija.

How do we form the perfect tense in the potential mood in this sentence?
We use the potential form of the auxiliary verb olla, which is lienee in the third-person singular, and combine it with the active past participle of the main verb. Since the main verb here is also olla (to be), the participle is ollut. This gives us lienee ollut (probably was or has probably been).
Why not just say Viikinki oli ehkä... instead of using the potential mood?
You absolutely could! Using ehkä (maybe) or todennäköisesti (probably) with the regular past tense is much more common in everyday speech. The potential mood (lienee ollut) is mostly used in written language, news, and literature to express probability elegantly in a single verb structure.
Let's break down the compound word tutkimusmatkailija. What are its parts?
It is made of two main parts: tutkimus (research, study, or exploration) and matkailija (traveler). A research-traveler perfectly describes an explorer! Notice that matkailija itself comes from matka (journey) via the verb matkailla (to travel around).
Why are rohkea and tutkimusmatkailija in the nominative case rather than the partitive?
In Finnish, when you use the verb olla to say what a specific, countable person or thing is, the describing noun and its adjective take the nominative case. Since viikinki is a single, countable person, rohkea tutkimusmatkailija stays in the nominative.

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