How to say in Czech: They speak Arabic.

English
speak
Czech
Oni mluví arabsky.
Do they speak Arabic?
They do not speak Arabic.
They do not speak Arabic very well.
They speak Arabic fluently.
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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