How to say in Czech: His native language is Russian.

English
native language is
Czech
Jeho rodný jazyk je ruština.
Russian is a difficult language.
What is his native language?
His Russian is getting better.
His Russian is very good.
How good is his Russian?
Is he learning Russian on his own?
He is learning Russian.
He is not Russian.
He is Russian.
Is he learning 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.