How to say in Czech: How good is her Polish?

English
How good is
Czech
Jak dobře umí polsky?
Her Polish is getting better.
Her Polish is very good.
Her native language is Polish.
Is she learning Polish on her own?
How do you say that in Polish?
I do not speak Polish very well.
You speak Polish very well.
He is learning Polish.
He is not Polish.
He is Polish.

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