Questions & Answers about Mikä sun fiilis on?
Why is the word sun used here instead of sinun?
Sun is the very common spoken language (puhekieli) version of sinun (your). In casual speech, Finns almost always shorten the genitive forms of the pronouns, so sinun becomes sun and minun becomes mun.
Where does the word fiilis come from?
Fiilis is a colloquial word meaning mood, feeling, or vibe. It is a loanword adapted from the English word feeling. You will hear it constantly in everyday Finnish, though you wouldn't typically use it in formal writing.
Why is there no possessive suffix attached to fiilis?
In formal written Finnish, you would usually add a possessive suffix to the noun to show ownership, which would look like sinun fiiliksesi. However, in spoken language, the suffix is almost always dropped. People simply rely on the short genitive pronoun (sun) before the word.
Why use mikä here instead of mitä?
We use mikä (the basic nominative form of what) because we are asking about the identity or state of a specific, whole thing (your mood) using the verb on (is). You would use the partitive mitä if you were asking about an ongoing action, an undefined amount, or with verbs that specifically trigger the partitive.