How to say in Czech: They do not speak Arabic.

English
do not speak
Czech
Oni nemluví arabsky.
They do not speak Arabic very well.
Do they speak Arabic?
They speak Arabic.
They speak Arabic fluently.
They speak Arabic very well.
They speak only a little Arabic.
Does anybody here speak Arabic?
Where did they learn Arabic?
Are they learning Arabic?
Are they learning Arabic on their own?

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