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

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

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