If a singular noun ends in an "s," use "'s" to create the possessive form only if the noun ends in a "s" sound. However, if the noun ends in a "z" sound, use just an apostrophe without adding an additional "s." This produces a more pronounceable possessive.I've assumed that you don't add an "s", though I've noticed Brits tend to add an "s". I better start writing correctly :o
Correct: The car in question was Roger Weiss's red convertible.
I was a student in Professor Abrams' Torts class.
I guess I've been wrong about possessive "s"
Uh oh...I've been following the wrong rule for years when it comes to possessive "s" after words that end with "s". According to IIT/Kent Law: