How to say in Czech: He speaks Dutch fluently.

English
speaks fluently.
Czech
On mluví plynně holandsky.
He speaks Dutch.
He speaks Dutch very well.
He speaks only a little Dutch.
Does he speak Dutch?
He does not speak Dutch.
He does not speak Dutch very well.
Does anybody here speak Dutch?
He is learning Dutch.
Is he learning Dutch?
Is he learning Dutch on his own?

Czech phrasebook and translator with tens of thousands of sentences translated by humans. Czechslator is being developed by Michal Měchura. CREDITS Czechslator's sentence generation engine is partially based on Grammatical Framework. All Czech pronunciation is computer-generated using Microsoft Azure Text to Speech. When Czechslator cannot find a translation in its own database, it looks in the PanLex dictionary or obtains a machine translation from Microsoft Translator. PRIVACY Czechslator does not save any cookies in your web browser and does not collect personally identifiable data. Czechslator uses StatCounter for traffic analysis, configured not to save any cookies in your web browser and not to collect any personally identifiable data.