How to say in Czech: Where did they learn Polish?

English
Where did learn
Czech
Kde se naučili polsky?
Are they learning Polish?
Are they learning Polish on their own?
They are learning Polish.
Do they speak Polish?
They do not speak Polish.
They do not speak Polish very well.
Are they Polish?
They are not Polish.
They are Polish.
They speak only a little Polish.

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