POSSESSIVE CASE
Personal names ending in “s” can make the possessive with an apostrophe  without an extra ”s” . We can say either Charles ’s  wife was at the party with him. (more common) or Charles ’  wife was at the party with him. (less common)
Commonly the possessive is made with apostrophe  without  an extra “s”. Socrates ’  speeches Hercules ’  labors Venus ’  beauty
The possessive is formed with  ‘s  (singular ) or  es’   (plural): The boss ’ s  office is full of work to do. The boss es ’   offices are on the third floor.
When there are  more than one possessor  that own the same  belonging , we add ‘s after the last possessor: John, Lucas and Carol ’s  mother is here to talk to you. (The woman has 3 children: John, Lucas and Carol and is  their  mother.)
If there are  more than one possessor , but each one owns a  different belonging , we add ‘s after each possessor: Robert ’s  and Luca ’s  cars are parked over there. (Robert has one car and Lucas has another)
Which is more common? a) Hans’s mother b) Hans’ mother
Which is more common? Hans ’s  mother More common with ‘s
Which is more common? a) Venus’s life b) Venus’ life
Which is more common? b)  Venus ’  life ( classical  name)
Who do they belong to? Carol and Alice ’s  brothers are here. Carol ’s  and Alice’ s  brothers are here.
Who do they belong to? Carol and Alice ’s  brothers are here. (They are probably sisters and have 2 or more brothers, who are here.)
Carol ’s  and Alice ’s  brothers are here. (Carol has a brother and Alice has a brother as well. Both of them are here.)
 

Possessive case - special rules

  • 1.
  • 2.
    Personal names endingin “s” can make the possessive with an apostrophe without an extra ”s” . We can say either Charles ’s wife was at the party with him. (more common) or Charles ’ wife was at the party with him. (less common)
  • 3.
    Commonly the possessiveis made with apostrophe without an extra “s”. Socrates ’ speeches Hercules ’ labors Venus ’ beauty
  • 4.
    The possessive isformed with ‘s (singular ) or es’ (plural): The boss ’ s office is full of work to do. The boss es ’ offices are on the third floor.
  • 5.
    When there are more than one possessor that own the same belonging , we add ‘s after the last possessor: John, Lucas and Carol ’s mother is here to talk to you. (The woman has 3 children: John, Lucas and Carol and is their mother.)
  • 6.
    If there are more than one possessor , but each one owns a different belonging , we add ‘s after each possessor: Robert ’s and Luca ’s cars are parked over there. (Robert has one car and Lucas has another)
  • 7.
    Which is morecommon? a) Hans’s mother b) Hans’ mother
  • 8.
    Which is morecommon? Hans ’s mother More common with ‘s
  • 9.
    Which is morecommon? a) Venus’s life b) Venus’ life
  • 10.
    Which is morecommon? b) Venus ’ life ( classical name)
  • 11.
    Who do theybelong to? Carol and Alice ’s brothers are here. Carol ’s and Alice’ s brothers are here.
  • 12.
    Who do theybelong to? Carol and Alice ’s brothers are here. (They are probably sisters and have 2 or more brothers, who are here.)
  • 13.
    Carol ’s and Alice ’s brothers are here. (Carol has a brother and Alice has a brother as well. Both of them are here.)
  • 14.