The noun sister is not a possessive noun. The noun sister is a singular, common noun, a word for a person.
A possessive noun is a word that indicates that something in the sentence belongs to that noun. Possession is shown by adding an apostrophe s ('s) to the end of the noun or just an apostrophe to the end of nouns already ending with s (s'). Example:
Singular possessive: This is my sister's room.
Plural possessive: Both of my sisters' husbandswork at the university.
The possessive form of the singular noun sister-in-law is sister-in-law's.Example: We're planning a party for my sister-in-law's birthday.
The word sister's is a possessive, singular noun. It can also be a contraction of "sister is".The word sisters is a plural noun and sisters' is a possessive, plural noun.
The possessive form of the singular noun sister is sister's.Example: Today is my sister's birthday.
The plural form of the singular noun sister is sisters.The plural possessive form is my sisters'.Example: My sisters' names are Laverne and Shirley.
The noun vest is the singular form.The noun vest's is the singular possessive form.
The possessive form of the singular noun sister-in-law is sister-in-law's.Example: We're planning a party for my sister-in-law's birthday.
The possessive form of the singular noun sister is sister's.Example: My sister's name is Gloria.
The word sister's is a possessive, singular noun. It can also be a contraction of "sister is".The word sisters is a plural noun and sisters' is a possessive, plural noun.
The possessive form of the singular noun sister is sister's.Example: Today is my sister's birthday.
The possessive form of the compound noun sister-in-law is sister-in-law's.Example: My sister-in-law's birthday is the same day as mine.
The singular possessive form is Karen Jones's; for example: This is Karen Jones's sister.
"Firefly's" is a singular possessive noun.
The singular possessive noun is stepchild's.
The plural form of the singular noun sister is sisters.The plural possessive form is my sisters'.Example: My sisters' names are Laverne and Shirley.
No, "tomb" is a singular common noun, not a possessive noun.
The singular possessive of "sister" is "sister's." For example, "I am borrowing my sister's dress."
The singular noun is tooth.The singular possessive noun is tooth's.