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

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

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