Apostrophe after S - Grammar Monster
www.grammar-monster.com › apostrophe_after_sApostrophe after S (with Examples) When showing possession, the apostrophe goes after the "s" when the possessor is plural. For example: The hamsters' cage (This is the cage of more than one hamster, so the apostrophe goes after the "s.") The apostrophe also goes after the "s" when the possessor is singular and ends with an "s." For example:
Apostrophe after S | The Apostrophe Guide
apostrophe.guide › apostrophe-after-sIf the apostrophe appears before the letter s then it may denote that the possessive case is singular, i.e. the boy’s girlfriends. If it appears after the s, then it will most likely be plural, i.e. the girls’ boyfriends. However, if the name or word itself ends in s (for example, dress or Ozymandias), then you find yourself in muddier waters.