There are two accepted forms for possessive singular nouns that end with an s:
Add an apostrophe (') after the existing s at the end of the word: Williams'
Add an apostrophe s ('s) after the existing s at the end of the word: Williams's
Examples:
Jim Williams' house is number four.
Jim Williams's house is number four.
The possessive form of the singular noun William is William's.
Example: I like William's new car.
The plural form for the word Williams is Williamses. The plural possessive form is Williamses'.example: The Williamses' house is the one on the corner.
The plural form for the word Williams is Williamses. The plural possessive form is Williamses'.example: The Williamses' house is the one on the corner.
plural possessive form: babies' singular possessive form: baby's
The singular possessive form is evening's. The plural possessive form is evenings'.
The possessive form for the noun family is family's.
The possessive form for the noun painter is painter's.
The singular possessive form is mother's.The plural possessive form is mothers'.
If Williams is a family name, the plural would be the Williamses.
The possessive form for the 'recipe of the chef' is the chef's recipe.
The possessive form is the mouse's barbecue.
Choir's is the possessive form of the noun.
The difference between "Williams" and "Williams'" lies in their usage as possessive forms. "Williams" is used as a possessive form when referring to something that belongs to multiple people with the last name Williams. On the other hand, "Williams'" is used as a possessive form when referring to something that belongs to an entity or organization named Williams.