How do you make a singular noun that ends in s possessive?

Answer 1

There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word; for example, "Put it on the boss' desk."

Add an apostrophe s ('s) after the existing s at the end of the word; for example, "Put it on the boss's desk."

I personally write the singular possessive form based on how I say the possessive phrase. If you are a student, use the form that is preferred by your teacher.

Answer 2

To make a singular noun that ends in s possessive, simply add an apostrophe followed by another s. For example, "dress" becomes "dress's" and "glass" becomes "glass's".