4th Declension M/F s pl N s -us -u -ua -uum -ui -ibus -um
Spirit-us Spirit-ui Spirit-um Spirit-u Spirit-uum Spirit-ibus Gen-u Gen-us Gen-ua Gen-uum Gen-ibus
5th Declension All feminine except dies (m) and compounds pl -es -ei -erum -ebus -em -e
Res, rei (f) Res Rei Rerum Rebus Rem Re
Uses of the Ablative Without Preposition Means Manner Time when or within which Separation
Uses of the Ablative With Preposition Accompaniment: cum Manner: cum Place where: in, sub Place from which: ab, de, ex Separation: ab, de, ex Personal agent: ab Part of a group with cardinal #’s: ex, de