Joe + ’s = Joe’s car
day + ’s = day’s effort
flag + ’s = flag’s colors
glass + ’s = glass’s cost

Note: If a plural noun ends in s, just add an apostrophe.

cars + ’ = cars’ interiors
televisions + ’ = televisions’ locations

Note: If a plural noun does not end in s, add ’s to the word.
mice + ’s = mice’s home
women + ’s = women’s department

Note: If a name of two or more syllables ends in an eez sound, the possessive is formed
without an additional s.

the tales of Ulysses = Ulysses’ tales
the speeches of Orestes = Orestes’ speeches

brother-in-law’s shoes
Jackson and Meyer’s law firm