Question 1

How is the phrase lienee ollut constructed to mean "probably was"?

Accepted Answer

This is the perfect tense of the potential mood, which is the focus of this lesson. It combines lienee, the present potential form of olla (meaning "is probably"), with the active past participle ollut. Together, they shift the probability into the past, translating to "probably has been" or "probably was".

Question 2

Why do we need the word siihen right before the että clause?

Accepted Answer

The verb perustua (to be based on) always requires its target to be in the illative case (the "into" case). Because you cannot attach an että clause directly to a verb that demands a specific case, Finnish uses the pronoun se in the required illative case (siihen) as a grammatical bridge. Literally, the sentence says "is based on it, that...".

Question 3

What is the difference between uskomus and the simpler word usko?

Accepted Answer

Both come from the verb uskoa (to believe). Usko generally refers to a broader "faith" or general belief (such as religious faith or having faith in someone's abilities). Adding the suffix -mus creates uskomus, which refers to a specific, discrete assumption, conviction, or myth that people hold as true.

Question 4

Why use the adverb oikein instead of the adjective oikea for "right"?

Accepted Answer

While you could grammatically say teoria lienee ollut oikea (the theory probably was a correct one), using the adverb oikein with the verb olla is a very common Finnish idiom. Olla oikein is the standard way to express that a statement, calculation, or theory "is right" regarding facts.

Tämä uskomus perustuu siihen, että teoria lienee ollut oikein.

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