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

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

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