106. The interrogative pronoun (and pronominal adjective) is "kiu",
who, which. Since the use of this pronoun indicates a question, the
sentence containing it does not need the interrogative adverb "cxu"
(30):
Kiu vokas vin? Who calls you?
Kiun vi vokas? Whom do you call?
Kiuj el vi vokis nin? Which (ones) of you called us?
Kiujn li helpis? Whom (which ones) did he help?
Kiun tagon vi venos? What day will you come?
Kiujn legomojn vi preferas? What vegetables do you prefer?
Mi miras kiun libron vi acxetis? I wonder which book you bought?
107. The interrogative pronoun "kiu" has a possessive or genitive form
"kies", whose:
En kies domo vi logxas? In whose house do you reside?
Kies amikojn vi vizitis? Whose friends did you visit?