grammatica: Nominative and Accusative Noun and adjective endings are very important to comprehending Latin. These endings express cases ‒ different grammatical pieces of a sentence. Below are the nominative (subject) and accusative (direct object) case endings for 1st declension (often feminine words ending in -a), 2nd declension (often masculine words ending in -us), and 2nd declension neuter (ends in -um).
Nom. Acc.
Sing. -a femina
Pl. -ae feminae
-am feminam
-as feminas
Nom. Acc.
Sing. -us hortus
Pl. -i horti
-um hortum
-os hortos
Nom. Acc.
Sing. -um forum
Pl. -a fora
-um forum
-a fora
These endings are also used for adjectives that match the same gender and case as the nouns they modify. Sara Chopra
2018