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

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

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