How to say in Czech: How good is her Greek?

English
How good is
Czech
Jak dobře umí řecky?
Her Greek is getting better.
Her Greek is very good.
Her native language is Greek.
Is she learning Greek on her own?
How do you say that in Greek?
I do not speak Greek very well.
You speak Greek very well.
Greek is a difficult language.
Greek is difficult.
He is learning Greek.

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