d the men who were taken_
_The Romans killed the woman who was taken_
/Romani interfecerunt viros qui capti sunt\
/Romani interfecerunt feminam quae capta est\

In the first sentence _who_ (qui) refers to the antecedent _men_
(viros), and is _masculine plural_. In the second, _who_ (quae)
refers to _woman_ (feminam), and _feminine singular_. From this we
learn that the relative must agree with its antecedent in _gender_ and
_number_. In neither of the sentences are the antecedents and relatives
in the same case. /Viros\ and /feminam\ are accusatives, and /qui\ and
/quae\ are nominatives, being the subjects of the subordinate clauses.
Hence

_224._ RULE. Agreement of the Relative. _A relative pronoun must agree
with its antecedent in gender and number; but its case is determined by
the way it is used in its own clause._

_225._ Interrogative Pronouns. An interrogative pronoun is a pronoun
that asks a question. In English the interrogatives are _who?_ _which?_
_what?_ In Latin they are /quis?\ /quid?\ (pronoun) and /qui:?\ /quae?\
/quod?\ (adjective).

_226._ Examine the sentences

_a._ _Who is the man?_ Quis est vir?
_b._ _What man is leading them?_ Qui vir eos ducit?

In _a_, _who_ is an interrogative _pronoun_. In _b_, _what_ is an
interrogative _adjective_. Observe that in Latin /quis\, /quid\ is the
_pronoun_ and /qui:\, /quae\, /quod\ is the _adjective_.

_227._ 1. The interrogative adjective /qui:\, /quae\, /quod\ is declined
just like the relative pronoun. (See Sec. 221.)

2. The interrogative pronoun /quis\, /quid\ is declined like /qui:\,
/quae\, /quod\ in the plural. In the singular it is declined as
follows:

MASC. AND FEM. NEUT.
Nom. quis, _who?_ quid, _what? which?_
Gen. cuius, _whose?_ cuius, _whose?_
Dat. cui, _to_ or _for whom?_ cui, _to_ or _for_
_what_ or _which?_
Acc. quem, _whom?_ quid, _what? which?_
Abl. quo:, _from_, etc., _whom?_ quo:, _from_, etc.,
_which_ or _what?_

NOTE. Observe that the masculine and feminine are alike and that all the
forms are like the corresponding forms of the relative, excepting quis
and quid.

_228._ EXERCISES

I. 1. Quis est aeger? Servus quem amo est aeger. 2. Cuius scutum habes?
Scutum habeo quod legatus ad castellum misit. 3. Cui legatus suum scutum
dabit? Fil