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

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

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