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

English
is very good.
Czech
Jejich holandština je velmi dobrá.
I do not speak Dutch very well.
You speak Dutch very well.
How good is their Dutch?
Their Dutch is getting better.
Their native language is Dutch.
Are they learning Dutch on their own?
Dutch is a difficult language.
Dutch is difficult.
He is learning Dutch.
Is he learning Dutch?

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