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

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

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