There are two accepted forms for possessive singular nouns ending in s:
Add an apostrophe (') after the existing s at the end of the word: Davis'
Add an apostrophe s ('s) after the existing s at the end of the word: Davis's
Examples:
Mr. Davis' classroom is number twenty two.
Mr. Davis's classroom is number twenty two.
The possessive form of the proper noun Al Davis is Al Davis' or Al Davis's. Both are accepted possessive forms for singular nouns that end with s.Example:We went to Al Davis' reception.We Went to Al Davis's reception.
The singular possessive form is week's.
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 aircraft's.
The singular possessive form is frontiersman's.
The singular possessive form is contralto's.
The singular possessive form is speculum's.