The singular possessive form of the noun dentist is dentist's.
example: The dentist's waiting room was empty.
The singular possessive form is week's.
The singular noun is tooth.The singular possessive noun is tooth's.Example: The dentist smoothed the tooth's chipped edge.
The singular possessive form is classmate's.
The possessive form is Amos's.
The singular possessive form for the noun gypsy is gypsy's.
The singular possessive form for country is county's.
The singular form for the plural noun countries is country; the singular possessive form is country's.
singular possessive: boy'splural possessive: boys'
The singular possessive form is speculum's.
The singular possessive form is aircraft's.
The singular possessive form is frontiersman's.
The singular possessive form is contralto's.