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

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

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