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

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

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