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

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

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