How to say in Czech: They speak Greek.

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

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