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

English
Is learning on his own?
Czech
On se učí srbsky jako samouk?
He is learning Serbian.
Is he learning Serbian?
Where did he learn Serbian?
His native language is Serbian.
His Serbian is getting better.
His Serbian is very good.
How good is his Serbian?
He is not Serbian.
He is Serbian.
Is he Serbian?

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