How to say in Czech: Is he learning Greek on his own?

English
Is learning on his own?
Czech
On se učí řecky jako samouk?
He is learning Greek.
Is he learning Greek?
Where did he learn Greek?
His Greek is getting better.
His Greek is very good.
His native language is Greek.
How good is his Greek?
Does he speak Greek?
He does not speak Greek.
He does not speak Greek very well.

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