The most formal way to say "How are you" in Finnish is Mitä (sinulle) kuuluu? ['sinulle' is often omitted]
answer: Hyvää (minulle) kuuluu, kiitos = I'm fine, thanks.
Huonoa (minulle) kuuluu = I'm bad lol
If you want to ask how someone is feeling right now, then it's Miten (sinä) voit?
answer: hyvin (good) or huonosti (bad)
Miten menee? (a bit less formal)
answer: Hyvin menee = I'm doing well
Huonosti menee = doing not so well
Kuis hurisee (sinulla) ? ['sinulla' is most of times omitted]
(very informal)
answer: Hyvin (hurisee) = im fine
Huonosti (hurisee) = im bad
Puhekieli: most of times you'll hear things like sulle or sulla which is really same as sinulleor sinulla but in spoken language (puhekieli).
SINULLE --> SULLE
SINULLA --> SULLA
To ask in turn 'And you ?/What about you ?' you can ask:
Entä sinulle/sinulla ?
How to choose the right one ? The right one is that used in the question, with Mitä kuuluu ? you'll answer Entä sinulle?
Mitäs sinä?
Used mostly in circle of friends or by acquaintance. This one is more like saying 'sup in English.
Usually answered: "Ei mitään". Meaning: "Nothing special".
How are you doing? (More of a greeting-type)
Kuis menee? (NOTE: Contains slang: Kuis is equal to Kuinka, but it sounds much better this way)
For you is sinulle in Finnish.
How is miten in Finnish.
I am not Finnish. - (Minä) en ole suomalainen.
Dot is piste in Finnish.
Queen is kuningatar in Finnish.
Dead is kuollut in Finnish.
Butcher is teurastaja in Finnish.
Slow is "hidas" in Finnish.
Library is kirjasto in Finnish.
Pie is piirakka in Finnish.
Wonderful is ihana in Finnish.
Shoes is kengät in Finnish.