How to say in Czech: Their Portuguese is getting better.

English
is getting better.
Czech
Jejich portugalština se zlepšuje.
I do not speak Portuguese very well.
You speak Portuguese very well.
How good is their Portuguese?
Their Portuguese is very good.
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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