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

English
Are learning on their own?
Czech
Oni se učí srbsky jako samouk?
Are they learning Serbian?
They are learning Serbian.
Where did they learn Serbian?
How good is their Serbian?
Their native language is Serbian.
Their Serbian is getting better.
Their Serbian is very good.
Are they Serbian?
They are not Serbian.
They are Serbian.

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