How to say in Czech: They speak Dutch very well.

English
speak very well.
Czech
Oni mluví holandsky velmi dobře.
They do not speak Dutch very well.
Do they speak Dutch?
They do not speak Dutch.
They speak Dutch.
They speak Dutch fluently.
They speak only a little Dutch.
Does anybody here speak Dutch?
Your Dutch is very good.
Your Dutch is getting better.
How good is your Dutch?

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