How to say in Czech: He speaks Greek fluently.

English
speaks fluently.
Czech
On mluví plynně řecky.
He speaks Greek.
He speaks Greek very well.
He speaks only a little Greek.
Does he speak Greek?
He does not speak Greek.
He does not speak Greek very well.
Does anybody here speak Greek?
He is learning Greek.
Is he learning Greek?
Is he learning Greek on his own?

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