How to say in Czech: Are they learning Bulgarian on their own?

English
Are learning on their own?
Czech
Oni se učí bulharsky jako samouk?
Are they learning Bulgarian?
They are learning Bulgarian.
Where did they learn Bulgarian?
How good is their Bulgarian?
Their Bulgarian is getting better.
Their Bulgarian is very good.
Their native language is Bulgarian.
Are they Bulgarian?
They are Bulgarian.
They are not Bulgarian.

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