_Acc._ puerum agrum virum -um
_Voc._ puer ager vir Wanting
_Abl._ puerō agrō virō -ō

PLURAL.
_Nom._ puerī agrī virī -ī
_Gen._ puerōrum agrōrum virōrum -ōrum
_Dat._ puerīs agrīs virīs -īs
_Acc._ puerōs agrōs virōs -ōs
_Voc._ puerī agrī virī -ī
_Abl._ puerīs agrīs virīs -īs

1. Note that in words of the type of puer and vir the final vowel of the
stem has disappeared in the Nominative and Vocative Singular.

In the Nominative and Vocative Singular of ager, the stem is further
modified by the development of e before r.

2. The following nouns in -er are declined like puer: adulter, _adulterer_;
gener, _son-in-law_; LÄ«ber, _Bacchus_; socer, _father-in-law_; vesper,
_evening_; and compounds in -fer and -ger, as signifer, armiger.

Nouns in _-vus_, _-vum_, _-quus_.

24. Nouns ending in the Nominative Singular in -vus, -vum, -quus, exhibited
two types of inflection in the classical Latin,--an earlier and a
later,--as follows:--

_Earlier Inflection (including Caesar and Cicero)._
Servos, m., Aevom, n., Equos, m.,