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

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

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