How to say in Czech: Do they speak Polish?

English
Do speak
Czech
Mluví polsky?
They do not speak Polish.
They do not speak Polish very well.
They speak only a little Polish.
They speak Polish.
They speak Polish fluently.
They speak Polish very well.
Does anybody here speak Polish?
Where did they learn Polish?
Are they learning Polish?
Are they learning Polish on their own?

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