1.  's is used with singular nouns and plural nouns not ending in -s
      The man's job - men's perfume - the woman's car - women's handbags - 
      a child's voice - the children's room - the people's choice - the boy's house
2. A simple apostrophe (') is used with plural nouns ending in -s
       
      The girls' money - the students' books  The boys' schoolbag
3. Note the difference:
     Peter and Tom's house = Peter and Tom own the same house.
     Peter's and Tom's house = Peter and Tom own different houses
4. With compound nouns or names consisting of several words,  the last word takes the 's
     
      Her sister-in-law's friend - My step-father's name -
      Henry the Eighth's wives - The Prince of Wales's guard
5. Names ending in s can take 's or the apostrophe alone (')
    James's house /[...sɪz]        James' house 
6. In time expressions
     a week's holiday - today's newspaper . tomorrow's land
      
                                  Adapted from A Practical English Grammar A.J Thomson, A.V. Martinet     Oxford
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