There are two accepted forms for possessive singular nouns (common or proper) ending in s:
Add an apostrophe (') after the existing s at the end of the word; for example, "Mr. Williams' house is at the corner."
Add an apostrophe s ('s) after the existing s at the end of the word; for example, "Mr. Williams's house is at the corner."
Note: The -s's is the most commonly used form, but if you are a student, use the form that is preferred by your teacher.
The noun form Williams' is a plural possessivenoun.The singular possessive noun is William's.Examples:Both of the Willams' last names are similar, William Jackson and William Johnson. (plural)My brother William's birthday is on Saturday. (singular)
The singular possessive form of "test" is "test's".
The singular possessive pronouns are mine, yours, his, hers, and its. The singular possessive adjectives are my, your, his, her, and its.
The singular possessive is ant's.The plural possessive is ants'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is classmate's.
The singular possessive of dish is dish's
Taco's is the singular possessive.
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'sExamples: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 singular possessive is biker's; the plural possessive is bikers'.
The singular possessive is fish's.
Grave's is the singular possessive.