How to say in Czech: Are they learning Arabic on their own?

English
Are learning on their own?
Czech
Oni se učí arabsky jako samouk?
Are they learning Arabic?
They are learning Arabic.
Where did they learn Arabic?
How good is their Arabic?
Their Arabic is getting better.
Their Arabic is very good.
Their native language is Arabic.
Do they speak Arabic?
They do not speak Arabic.
They do not speak Arabic very well.

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