147. Like English "whose" the genitive form "kies" of the interrogative
pronoun (107) is also used as a relative, referring to a substantive
(singular or plural) for its antecedent:

Li estas la viro, kies libron vi trovis,
he is the man whose book you found.
Mi konas la infanojn, kies patro estas amiko via,
I know the children whose father is a friend of yours.


THE FUTURE PERFECT TENSE.

148. The compound tense formed by combining the past participle with the
future tense of the auxiliary verb "esti" represents an act or condition
as having been already completed or perfected at a future time, and is
called the "future perfect tense." The conjugation of "vidi" in this
tense is as follows:


mi estos vidinta, I shall have seen (I shall be having-seen).
vi estos vidinta, you will have seen (you will be having-seen).
li (sxi, gxi) estos vidinta,
he (she, it) will have seen (will be having-seen).
ni estos vidintaj, we shall have seen (shall be having-seen).
vi estos vidintaj, you will have seen (will be having-seen).
ili estos vidintaj, they will have seen (will be having-seen).


ORDINAL NUMERALS.