Genitive Case - English

English

Old English had a genitive case, which has left its mark in modern English in the form of the possessive ending -'s (now sometimes referred to as the "Saxon genitive"), as well as possessive pronoun forms such as his, theirs, etc., and in certain words derived from adverbial genitives such as once and afterwards. (Other Old English case markers have generally disappeared completely.) The modern English possessive forms are not normally considered to represent a grammatical case, although they are sometimes referred to as genitives or as belonging to a possessive case. One of the reasons that the status of -'s as a case ending is often rejected is that it attaches to the end of a noun phrase and not necessarily to the head noun itself, as in the king of Spain's daughter, not the king's of Spain daughter as would be expected if -'s were a case inflection on the noun king (and as was done in older forms of English).

For details, see English possessive.