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

English
is getting better.
Czech
Jeho portugalština se zlepšuje.
I do not speak Portuguese very well.
You speak Portuguese very well.
His Portuguese is very good.
How good is his Portuguese?
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.
Portuguese is difficult.

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