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

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

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