How to say in Czech: They are learning Arabic.

English
are learning
Czech
Oni se učí arabsky.
Are they learning Arabic?
Are they learning Arabic on their own?
Where did they learn Arabic?
Do they speak Arabic?
They do not speak Arabic.
They do not speak Arabic very well.
They speak Arabic.
They speak Arabic fluently.
They speak Arabic very well.
They speak only a little Arabic.

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