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 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 contralto's.
The singular possessive form is aircraft's.
The singular possessive form is frontiersman'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'.
The singular form for the noun families is family. The singular possessive form is family's.