203. The indefinite pronoun (and pronominal adjective) "iu", any one,
a certain one, presents the idea of some person or thing, without
definitely characterizing it:
Mi parolas pri iu, kiun vi konas,
I am talking about a certain one whom you know.
Mi vizitis iujn el viaj amikoj,
I visited some of your friends.
Mi havas kelkajn pomojn, sed iuj ne estas bonaj,
I have several apples, but certain ones are not good.
Iuj pontoj estas bone faritaj,
some bridges are well made.
204. The indefinite pronoun "iu" has a possessive or genitive form
"ies", somebody's, someone's, a certain one's:
Mi tusxis ies brakon, I touched someone's arm.
Cxu ies surtuto kusxas sur la tablo?
Is anybody's overcoat lying on the table?
Ies ludiloj estas rompitaj, someone's playthings are broken.