How to say in Czech: How good is his Lithuanian?

English
How good is
Czech
Jak dobře umí litevsky?
His Lithuanian is getting better.
His Lithuanian is very good.
How do you say that in Lithuanian?
I do not speak Lithuanian very well.
You speak Lithuanian very well.
His native language is Lithuanian.
Is he learning Lithuanian on his own?
He is learning Lithuanian.
Is he learning Lithuanian?
Lithuanian is a difficult language.

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