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

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

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