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

English
is getting better.
Czech
Jeho holandština se zlepšuje.
I do not speak Dutch very well.
You speak Dutch very well.
His Dutch is very good.
How good is his Dutch?
His native language is Dutch.
Is he learning Dutch on his own?
Dutch is a difficult language.
Dutch is difficult.
He is learning Dutch.
Is he learning Dutch?

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