The possessive form of the singular noun box is box's.
Example: The box's contents are a mystery.
The singular possessive of boxes is box's. eg
The box's sides were broken and the top was open
The singular possessive noun of boxes is box's.
The singular possessive noun is stepchild's.
"Firefly's" is a singular possessive noun.
The singular noun is tooth.The singular possessive noun is tooth's.
The singular possessive form for the noun brush is brush's.
The noun vest is the singular form.The noun vest's is the singular possessive form.
No, the noun creatures' is the possessive form of the plural noun creatures.The singular possessive form is creature's.
No, "she's" stands for she is. The singular possessive noun for a female is her or hers.
Yes, "story's" is the singular possessive form of the noun "story."
The singular noun possessive form of "robes" is "robe's."
The singular possessive form for the noun clock is clock's.
No, it is a singular possessive noun.
The singular possessive noun is Rex's.