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

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

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