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

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

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