How to say in Czech: They speak Greek very well.

English
speak very well.
Czech
Oni mluví řecky velmi dobře.
They do not speak Greek very well.
Do they speak Greek?
They do not speak Greek.
They speak Greek.
They speak Greek fluently.
They speak only a little Greek.
Does anybody here speak Greek?
Your Greek is very good.
Your Greek is getting better.
How good is your Greek?

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