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

English
is getting better.
Czech
Jejich bulharština se zlepšuje.
I do not speak Bulgarian very well.
You speak Bulgarian very well.
How good is their Bulgarian?
Their Bulgarian is very good.
Their native language is Bulgarian.
Are they learning Bulgarian on their own?
Bulgarian is a difficult language.
Bulgarian is difficult.
He is Bulgarian.
He is learning Bulgarian.

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