How to say in Czech: Where do they know us from?

English
Where do know from?
Czech
Odkud nás znají?
Where are you going?
Excuse us.
Do they understand us?
Where do I buy a ticket?
They do not know us.
They have known us for a long time.
They know us well.
They would like to get to know us better.
Where are they from?
Where did they learn Arabic?

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.