How to say in Czech: His Polish is getting better.

English
is getting better.
Czech
Jeho polština se zlepšuje.
I do not speak Polish very well.
You speak Polish very well.
His Polish is very good.
How good is his Polish?
His native language is Polish.
Is he learning Polish on his own?
He is learning Polish.
He is not Polish.
He is Polish.
Is he learning Polish?

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