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: princess'
Add an apostrophe s ('s) after the existing s at the end of the word: princess's
Examples:
The princess' nanny took her to the museum.
The princess's nanny took her to the museum.
Princesses
The singular possessive form is story's.
The possessive form for the noun dynasty is dynasty's.
The correct spelling for the possessive form of "college" is "college's."
kids'
The possessive of scientist is scientist's (apostrophe S).
contractor's
companies'
falcon's
municipalities
The singular form of the noun mice is mouse.The correct spelling of the possessive form of mouse is mouse's.example: The mouse's tracks led right to a gap in the basement door.
The single possessive of people is people's. The plural possessive of people is peoples'.
The correct possessive form of the plural noun women is women's.Example: The women's project is preparing the playground for summer.