A singular noun is a word for one person or thing.
A possessive noun is a noun used to indicate ownership, possession, origin or purpose. A possessive noun is indicated by adding an apostrophe s ('s) to the end of a singular noun.
Examples:
The girl's doll (ownership)
The teacher's desk (possession)
Shakespeare's plays (origin)
The boy's birthday party (purpose)
The singular possessive is fish's.
Buzz's is the singular possessive.
The possessive form is Amos's.
The singular possessive form is foot's.
The singular possessive form is box's.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
The singular possessive form is your friend'sbaby.
The singular possessive of "ant" is "ant's" and the plural possessive is "ants'".
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
The singular possessive of dish is dish's
The singular possessive is Martin's.
The singular possessive is fish's.
Grave's is the singular possessive.
The singular possessive form of "test" is "test's".
Buzz's is the singular possessive.
The singular possessive is biker's; the plural possessive is bikers'.