How to say in Czech: Their native language is Japanese.

English
native language is
Czech
Jejich rodný jazyk je japonština.
What is their native language?
Japanese is a difficult language.
How good is their Japanese?
Their Japanese is getting better.
Their Japanese is very good.
Are they learning Japanese on their own?
He is Japanese.
He is learning Japanese.
He is not Japanese.
Is he Japanese?

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.