How to say in Czech: They speak Bulgarian.

English
speak
Czech
Oni mluví bulharsky.
Do they speak Bulgarian?
They do not speak Bulgarian.
They do not speak Bulgarian very well.
They speak Bulgarian fluently.
They speak Bulgarian very well.
They speak only a little Bulgarian.
Does anybody here speak Bulgarian?
Are they Bulgarian?
Are they learning Bulgarian?
Are they learning Bulgarian on their own?

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