How to say in Czech: Is he learning Arabic on his own?

English
Is learning on his own?
Czech
On se učí arabsky jako samouk?
He is learning Arabic.
Is he learning Arabic?
Where did he learn Arabic?
His Arabic is getting better.
His Arabic is very good.
His native language is Arabic.
How good is his Arabic?
Does he speak Arabic?
He does not speak Arabic.
He does not speak Arabic very well.

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