Breakdown of Zar se ne poznajete?
ne
no, not
zar
really? (surprise) / right? (tag question)
sebe
oneself (stressed reflexive)
poznavati
to know (somebody)
Questions & Answers about Zar se ne poznajete?
Why does se mean "each other" here instead of "yourselves"?
The pronoun se is usually reflexive (doing an action to yourself), but when the verb is plural—like poznajete (you all know)—it is often reciprocal. This means the action happens between the people involved, translating perfectly to "each other" or "one another."
What is the purpose of Zar at the beginning of the sentence?
Zar is a question word used to express surprise or disbelief. Instead of just asking a neutral question, starting with Zar makes it mean "Really?" or "Is it actually true that you don't know each other?"
Why does se come before ne poznajete?
The word se is an enclitic, which means it strictly needs to sit in the second position of a sentence. Since Zar takes up the first spot, se goes right after it, coming before the negated verb ne poznajete.
Could I use znate instead of poznajete here?
While you might hear native speakers mix them up, it is much better to use the verb poznavati (which gives us poznajete) when talking about being personally acquainted with people. The verb znati is generally used for knowing facts or knowing how to do a skill.