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

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

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.