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

English
How good is
Czech
Jak dobře umějí řecky?
Their Greek is getting better.
Their Greek is very good.
How do you say that in Greek?
I do not speak Greek very well.
You speak Greek very well.
Their native language is Greek.
Are they learning Greek on their own?
Greek is a difficult language.
Greek is difficult.
He is learning Greek.

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