How to say in Czech: His native language is Dutch.

English
native language is
Czech
Jeho rodný jazyk je holandština.
Dutch is a difficult language.
His Dutch is getting better.
His Dutch is very good.
How good is his Dutch?
Is he learning Dutch on his own?
Dutch is difficult.
He is learning Dutch.
Is he learning Dutch?
Do you speak Dutch?
I do not speak Dutch.

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