The possessive singular of all English nouns, regardless of spelling, is formed by adding 's: heiress's (pronounced as if it were a plural).
heiress's
The singular possessive is fish's.
Buzz's is the singular possessive.
The possessive form is Amos's.
Mary's is the singular possessive form.
heiress's
The plural form of the noun heiress is heiresses.The plural possessive form is heiresses'.example: The heiresses' father gave close scrutiny to their suitors.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
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 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 is test's.
Buzz's is the singular possessive.
The singular possessive is biker's; the plural possessive is bikers'.