How to say in Czech: They speak Danish fluently.

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

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