How to say in Czech: They speak Arabic fluently.

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

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