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

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

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