How to say in Czech: Do they speak Dutch?

English
Do speak
Czech
Mluví holandsky?
They do not speak Dutch.
They do not speak Dutch very well.
They speak Dutch.
They speak Dutch fluently.
They speak Dutch very well.
They speak only a little Dutch.
Does anybody here speak Dutch?
Where did they learn Dutch?
Are they learning Dutch?
Are they learning Dutch on their own?

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