jak zapytac?

jak zapytac : Skąd znasz j. polski?
where do you know Polish from? czy how do you know Polish?

How do you know the Polish language?-jest OK.
Albo tez:
Where did you learn the Polish language?
Where did you learn to speak Polish?

Albo np.:

How come you know Polish? /duuuże zaskoczenie

lub

How did you get to know Polish? /trochę bardziej neutralnie

nigdy nie widzialam "how do you know polish language"... moze "how come that you know.." ale to raczej jakim cudem znasz, czy jak to mozliwe, ze znasz