There are two accepted forms for a possessive singular that ends in s:
Add an apostrophe s ('s) after the existing s at the end of the word.
Example: The campus's size is about eight acres.
Add an apostrophe (') after the existing s at the end of the word.
Example: The campus' size is about eight acres.
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 possessive is campus's.The possessive of a singular noun can always use apostrophe-S. It is only when the plural is formed by adding S or ES that the apostrophe only is used (e.g. campuses becomes campuses').
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 of dish is dish's
Taco's is the singular possessive.
The singular possessive form is classmate's.
The singular possessive is biker's; the plural possessive is bikers'.
The singular possessive is fish's.
Buzz's is the singular possessive.
Grave's is the singular possessive.