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

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

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