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

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

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