Questions & Answers about Oletko vapaa huomenna?
Oletko is the 2nd person singular question form of the verb olla (to be).
- olet = you are
- -ko/-kö = question particle attached to the word being questioned
So:
- olet
- -ko → oletko = are you
In yes–no questions, Finnish usually adds -ko/-kö instead of using a separate word like do or are. The choice between -ko and -kö depends on vowel harmony: olet has back vowels (o, e), so it gets -ko.
In Finnish, the personal pronoun is often dropped because the verb ending already shows the person:
- olen = I am (so I is clear)
- olet = you are (so you is clear)
- oletko = are you
So Oletko vapaa huomenna? already clearly means Are you free tomorrow? without needing sinä.
You can add the pronoun for emphasis or contrast:
- Oletko sinä vapaa huomenna?
→ Still Are you free tomorrow?, but with emphasis on you (as opposed to someone else).