How to say in Czech: Do they speak Greek?

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

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