"Kiu estas tie?"

Translation: Who is there?

[Vietata]

La granda malbona lupo!

[clh335763]

kurus rapide!

[kholden83]

Knock knock

[remonpilip]

kiu estas tie?

[BeauZC]

Why is "what is there" considered wrong?

[mizinamo]

Because "Kiu?" is "Who?"

(Or it could be "Which one?". But not "What?" -- that is "Kio?".)

[MechanixZem]

"Kiu" means "who" or "which one", as in "Kiun skribilon vi prenis el mia skribilulo?"

[jbrock64]

How would you say who is at the door would you say kiu estas ĉe la pordo ?