How to say in Czech: They speak Slovenian fluently.

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

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