How to say in Czech: Where do you know them from?

English
Where do know from?
Czech
Odkud je znáš?
Where are you going?
Where do I buy a ticket?
Do you understand them?
You do not know them.
You have known them for a long time.
You know them well.
You would like to get to know them better.
Where are you from?
Where did you learn Arabic?
Where do you live?

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