How to say in Czech: They speak French fluently.

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

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