Possessive proper nouns are formed exactly the same as common possessive nouns. Singular possessive nouns are formed by adding an apostrophe s ('s) to the end of a noun. Plural possessive nouns that end in -s, are formed by adding an apostrophe after the existing -s; for irregular plural nouns that don't end with -s, the possessive is formed by adding the apostrophe s the same as a singular noun.
Examples:
Abraham Lincoln - Abraham Lincoln's Gettysburg Address
Chicago - Chicago's mayor
The Eiffel Tower - The Eiffel Tower's history
The plural form of the noun 'property' is properties.The plural possessive form is properties'.Example:All of the properties' owners have been compensated for the damage.
Property's (singular possessive form) rhymes with properties (plural form).
The noun quantum is a singularnoun. The plural form is quanta.A possessive noun requires the use of an apostrophe.The singular possessive form is quantum's. The plural possessive form is quanta's.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The possessive form of the plural noun managers is managers'.Example: The managers' salaries are not much higher than ours.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural form is stepsisters. The plural possessive is stepsisters'.
The plural form is inches. The plural possessive is inches'.