How to say in Czech: His Dutch is very good.

English
is very good.
Czech
Jeho holandština je velmi dobrá.
I do not speak Dutch very well.
You speak Dutch very well.
His Dutch is getting better.
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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