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

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

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