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

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

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