How to say in Czech: They are learning Vietnamese.

English
are learning
Czech
Oni se učí vietnamsky.
Are they learning Vietnamese?
Are they learning Vietnamese on their own?
Where did they learn Vietnamese?
Do they speak Vietnamese?
They do not speak Vietnamese.
They do not speak Vietnamese very well.
They speak only a little Vietnamese.
They speak Vietnamese.
They speak Vietnamese fluently.
They speak Vietnamese very well.

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.