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

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

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