A Noun that expresses ownership or possession is inthe possessive case. The symbol used in the possesive case is the apostrophe and the s.
Add 's to the singular form of noun to show singular possession.
e.g. Girl's book report
Add ' only to the plural nouns ending in -s.
e.g. Girl's project
Add apostrophe and -s if the plural form does not end in -s.
e.g. Women's loyalty
When 2 or more nouns eachown an object, separate ownership is observed.