The possessive form of the noun bird is bird's.
example: We sat quietly and listened to a bird's call.
The possessive form of the plural noun birds is birds'.
example: We watched the birds' formation pass overhead.
The possessive form is the bird's wings.
The possessive form is the vultures' wings.
The vulgurs’ wings
bird's
The plural form is squirrels; the plural possessive form is squirrels'.
The plural form of the noun bird is birds.The plural possessive form is birds'.example: We watched a birds' formation pass overhead.
For a single owl - this is the owl's feather. For many owls - these are owls' feathers.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural form is founders. The plural possessive is founders'.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
The singular possessive form for the noun knife is knife's.The plural form is knives; the plural possessive form is knives'.
The noun 'sister' is not plural and is not possessive.The plural form is sisters.The possessive form is sister's.The plural possessive form is sisters'.
The singular form is goose; the singular possessive form is goose's.The plural form is geese; the plural possessive form is geese's.
The plural possessive form of "cherubim" is "cherubim's."
The plural form is valleys. The plural possessive is valleys'.
The plural form is squirrels. The plural possessive is squirrels'.