How to say in Czech: Their Portuguese is very good.

English
is very good.
Czech
Jejich portugalština je velmi dobrá.
I do not speak Portuguese very well.
You speak Portuguese very well.
How good is their Portuguese?
Their Portuguese is getting better.
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.
Portuguese is difficult.

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