How do you say "Δεν καταλαβαίνω" in Greek?

"Δεν καταλαβαίνω" in Greek means "I don't understand". Useful phrase when you need clarification or don't comprehend something.

Can you give an example of "Δεν καταλαβαίνω" in a sentence?

"Συγγνώμη δεν καταλαβαίνω ελληνικά" which translates to "Sorry, I don't understand Greek"

Politeness marker + negative particle + verb + language noun. The syntax is: Apology + negation + verb + object