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

English
do not speak very well.
Czech
Oni nemluví moc dobře arabsky.
They speak Arabic very well.
They do not speak Arabic.
Do they speak Arabic?
They speak Arabic.
They speak Arabic fluently.
They speak only a little Arabic.
Does anybody here speak Arabic?
Your Arabic is very good.
Your Arabic is getting better.
How good is your Arabic?

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