Heavy Construction
The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
 
 
 
 
305.
 A Relative agrees with its Antecedent in
Gender and Number; but its Case depends on its
construction in the clause in which it stands: -  
- ea diés quam
cónstituerat vénit (B. G. i. 8), that day which
he
had appointed came. 
- pontem quí erat ad
Genávam iubet rescindí (id. i. 7), he orders the
bridge which was near Geneva to be cut down. 
- Aduatucí, dé quibus
suprá díximus, domum revertérunt
(id.  ii. 29), the Aduatuci, of whom we have spoken above, returned
home.
NOTE:  This rule applies to all relative words so far as they
are variable in form:  as, quális,
quarltus, quícumque, etc. 
a. If a relative has two or more
antecedents, it follows the rules for the agreement of predicate
adjectives (§§ 286, 287): -  
- fílium et fíliam,
quós valdé díléxit, unó tempore
ámísit, he lost at the same time a son and a
daughter whom he dearly loved. 
- grandés nátú
mátrés et parvulí líberí,
quórum utrórumque aetás misericordiam nostram
requírit (Verr. v. 129), aged matrons and little
children, whose time of life in each case demands our compassion. 
- ótium atque dívitiae, quae
príma mortálés putant (Sall. Cat.  36),
idleness and wealth, which men count the first (objects of desire).
 
- eae frúgés et
frúctús quós terra gignit
(N. D. ii. 37), those fruits and crops which the earth
produces.
For the Person of the verb agreeing with the relative, see § 316. a.  
 
 
 
