Sinä olet siis kapteeni.

From Lesson 109:Time clauses (kun)·Finnish

Breakdown of Sinä olet siis kapteeni.

olla
to be
sinä
you
kapteeni
captain
siis
so, in other words

Questions & Answers about Sinä olet siis kapteeni.

Why is siis in the middle of the sentence instead of at the beginning like "so" in English?
In Finnish, small linking words and particles like siis (so, therefore, then) often sit right after the verb. While you could start the sentence with it (Siis sinä olet kapteeni), putting it after the verb is very common and sounds natural, similar to saying "You are, therefore, the captain" in English.
Why is kapteeni in its basic form here instead of the partitive case?
This sentence uses a predicative, which tells us what the subject is. Because the subject (sinä) is a specific person, the noun describing them (kapteeni) takes the basic nominative form. You would only use the partitive case here if the subject was an uncountable mass word (like coffee or water).
There is no word for "the" in this sentence. How do we know it means "the captain" and not "a captain"?
Finnish does not use articles like "a" or "the". The translation depends entirely on the context. If you are talking about the person commanding a specific ship, "the captain" is the most natural English translation. In a different situation, this exact sentence could also mean "So you are a captain."
Is this exactly how someone would say it in a normal conversation?
In everyday spoken Finnish, people usually shorten both the pronoun and the verb. Instead of the formal Sinä olet siis kapteeni, you are much more likely to hear Sä oot siis kapteeni.

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