Aún / Todavía = Yet (in negative forms: isn't, aren't, don't, doesn't, didn't, hasn't, haven't etc) Aun / Inclusive = Even *Notice that there is a difference between "Aún" and "Aun" (the little accent mark), it makes all the difference in meaning :) Examples: (aún / todavía) * I haven't finished my exam yet. = Aún / Todavía no he terminado mi examen. *Peter hasn't arrived yet. = Peter no ha llegado aún /todavía. *I don't have children yet. = No tengo hijos aún / todavía. *Sally is not ready yet. = Sally aún / todavía no está lista. *My friends haven't been at any concert yet. = Mis amigos aún / todavía no han estado en ningún concierto. ¡Espero que esto te haya ayudado, amigo! I hope this has helped you, friend! :)

It suposes that "aun" (without accent) means "even" e.g. "Aun los asesinos tienen amigos" / "Even killers have friends" "Aun si quieres salir, no tienes permiso" / "Even if you wanna go out, you have no permisssion" And it suposes that "aún" (with accent) means the same than "todavía": an accion which has lasted or has been repeated since a past", it means "still" in a positive sentence or "yet" in a negatice sentence" "Todavía/aún estoy en casa" / "I'm still at home" "Aún/todavía no he terminado la tarea" / "I haven't finished my homework yet" I say "it suposes that..." because in everyday life people confuses this three words, using them with a same meaning (even+still/yet).

"Aún" y "Todavía" se pueden usar igual y tienen el mismo significado, pero "aun cuando" es igual a "aunque"

Aún = todavía. A un y aun no significan todavía.