In contemporary usage the genitive is usually left unchanged after sibilants, and indicated with an apostrophe in writing:Max’ Vater. Such unchanged genitives, in turn, are often avoided and paraphrased:der Vater von Max (colloquially:vom Max).
The genitive is formed with-s after-ia:Claudias, Marias. Only the formMariens remains current, but it is restricted to theVirgin Mary.
Adverbs in-ens often have anabsolute superlative sense, meaning “at most, maximally” or “very much, exceedingly”. These forms are widely lexicalized, however. That is to say that they cannot be formed freely, except in poetic or humorous language.
