How to say in Czech: Is he learning Polish on his own?

English
Is learning on his own?
Czech
On se učí polsky jako samouk?
He is learning Polish.
Is he learning Polish?
Where did he learn Polish?
His native language is Polish.
His Polish is getting better.
His Polish is very good.
How good is his Polish?
He is not Polish.
He is Polish.
Is he Polish?

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