How to say in Czech: They speak only a little Dutch.

English
speak only a little
Czech
Oni mluví jen trochu holandsky.
Do they speak Dutch?
They do not speak Dutch.
They do not speak Dutch very well.
They speak Dutch.
They speak Dutch fluently.
They speak Dutch very well.
Does anybody here speak Dutch?
Are they learning Dutch?
Are they learning Dutch on their own?
They are learning Dutch.

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