RULE X.
The plural is usually formed from the singular by adding s; as, brave, braves; night, nights; hymn, hymns.
RULE XI.
Nouns ending in o preceded by a vowel accept of s in the plural; as, cameo, cameos; studio, studios.
ILLUSTRATIONS.
- agios
- bagnios
- bamboos
- braggadocios
- cameos
- cuckoos
- curculios
- embryos
- folios
- imbroglios
- intaglios
- internuncios
- koodoos
- nuncios
- olios
- oratorios
- pistachios
- port-folios
- punctilios
- ratios
- seraglios
- solfeggios
- studios
- trios
RULE XII.
Nouns ending in y preceded by a vowel accept of s in the plural; as, money, moneys; attorney, attorneys; valley, valleys.