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

English
Are learning on their own?
Czech
Oni se učí řecky jako samouk?
Are they learning Greek?
They are learning Greek.
Where did they learn Greek?
How good is their Greek?
Their Greek is getting better.
Their Greek is very good.
Their native language is Greek.
Do they speak Greek?
They do not speak Greek.
They do not speak Greek very well.

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