The singular possessive is biker's; the plural possessive is bikers'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
Niece's is a singular possessive noun. niece - singular nieces - plural niece's - singular possessive nieces' - plural possessive
The word sisters' is plural possessive. The singular is sister, singular possessive is sister's; the plural is sisters, the plural possessive is sisters'.
The singular possessive is ant's.The plural possessive is ants'.
The singular possessive is army's.The plural possessive is armies'.
The singular possessive is avocado's; the plural possessive is avocados'.
Women's is a plural possessive. The singular possessive is woman's
The singular possessive form is heart's; the plural possessive form is hearts'.
The singular possessive is author's. The plural possessive is authors'.
The singular possessive is author's. The plural possessive is authors'.
No, a possessive noun is formed by adding an -'s (or just an -' to the end of plural nouns already ending in -s) to the existing singular or plural noun; for example:singular=apple, singular possessive=apple's; plural=apples, plural possessive= apples'singular=boy, singular possessive=boy's; plural=boys, plural possessive=boys'singular=car, singular possessive=car's; plural=cars, plural possessive=cars'The nouns that drop the -y and add -ies is to form the plural are nouns ending in -y preceded by a consonant; for example:singular=ally; plural=allies (singular possessive=ally's; plural possessive=allies')singular=baby; plural=babies (singular possessive=baby's; plural possessive=babies')singular=city; plural=cities(singular possessive=city's; plural possessive=cities')
Sky's is singular possessive; skies is plural; skies' is plural possessive.