How to say in Czech: Their native language is Portuguese.

English
native language is
Czech
Jejich rodný jazyk je portugalština.
Portuguese is a difficult language.
How good is their Portuguese?
Their Portuguese is getting better.
Their Portuguese is very good.
Are they learning Portuguese on their own?
He is learning Portuguese.
Is he learning Portuguese?
Portuguese is difficult.
Do you speak Portuguese?
I do not speak Portuguese.

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