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

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

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