2nd Declension nouns US, um and r words

2nd Declension Second declension are mostly masculine and neuter nouns We know they are 2nd declension because they have a long i in the genitive singular. Most 2nd declension nouns end is us or um A few end in r

2nd Declension-us Nom: equus equi Gen: equi equorum Dat: equo equis Acc: equum equos AbL: equo equis equus, equi, m, horse

2ND DECLENSION-R NOM: puer pueri GEN: pueri puerorum DAT: puero pueris ACC: puerum pueros ABL: puero pueris PUER, PUERI, M, BOY

2nd Declension-um Nom bellum* bella* Gen belli bellorum Dat bello bellis Acc bellum* bella* abl bello bellis bellum, belli, n, war

NEUTER NOUN RULE NEUTER NOUNS ARE ALWAYS THE SAME IN NOM AND ACC CASES!

And now.... to abc song Us, I, O, Um, O, I, Orum Is, Os, Is second declension.