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

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

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