Singular Old English Approximate English TranslationNominative stān stoneAccusative stān stoneGenitive stānes of the stoneDative stāne to/for the stonePlural Old English Approximate English TranslationNominative stānas stonesAccusative stānas stonesGenitive stāna of the stonesDative stānum to/for the stones. The stem of the Old English word is clearly visible. It's stān to which different endings are being attached. The case endings are:Singular PluralNominative - -asAccusative - -asGenitive -es -aDative -e -um. There are many other nouns in Old English which follow this same pattern of case endings when they inflect, in fact some 35% of all Old English nouns follow this pattern. This pattern of endings is called the masculine a-declension. There are four other common declensional patterns in Old English, but a noun will belong to only one of them. Hence we can say that stan is a masculine a-declension noun.