How to say in Czech: Are they learning Lithuanian on their own?

English
Are learning on their own?
Czech
Oni se učí litevsky jako samouk?
Are they learning Lithuanian?
They are learning Lithuanian.
Where did they learn Lithuanian?
How good is their Lithuanian?
Their Lithuanian is getting better.
Their Lithuanian is very good.
Their native language is Lithuanian.
Do they speak Lithuanian?
They do not speak Lithuanian.
They do not speak Lithuanian very well.

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