The possessive form of the singular noun bike is bike's.
example: The bike's metal springs are rusted.
The word bikes is the pluralform of the singular noun bike.The singular possessive form of the noun bike is bike's.The plural possessive form of the noun bikes is bikes'.Examples:My bike's color is yellow.All of our bikes' colors are yellow.
The possessive noun Carlos's is the singular possessive form.The plural form of the noun Carlos is Carloses.The plural possessive form is Carloses'.Examples:I like Carlos's new bicycle.The Carloses' children are twins.
The possessive form is Amos's.
The singular form is goose; the singular possessive form is goose's.The plural form is geese; the plural possessive form is geese's.
Quantum is singular, not singular possessive. The singular possessive form is quantum's.
The singular possessive form is week's.
The singular possessive form is frontiersman's.
The singular possessive form is aircraft's.
The singular possessive form is contralto's.
The singular possessive form is speculum's.
The singular possessive form is herd's.
The singular possessive form is heart's; the plural possessive form is hearts'.