How to say in Czech: They speak Russian fluently.

English
speak fluently.
Czech
Oni mluví plynně rusky.
Do they speak Russian?
They do not speak Russian.
They do not speak Russian very well.
They speak only a little Russian.
They speak Russian.
They speak Russian very well.
Does anybody here speak Russian?
Are they learning Russian?
Are they learning Russian on their own?
Are they Russian?

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.