標點2-眾數的's

Possessives of Plurals & Irregular Plurals

Most plural nouns already end in s. To create their possessive, simply add an apostrophe after the s:

• The Pepins' house is the big blue one on the corner.
• The lions' usual source of water has dried up.
• The gases' odors mixed and became nauseating.
• The witches' brooms were hidden in the corner.
• The babies' beds were all in a row.

With nouns whose plurals are irregular (see Plurals), however, you will need to add an apostrophe followed by an s to create the possessive form.

• She plans on opening a women's clothing boutique.
• Children's programming is not a high priority.
• The geese's food supply was endangered.

(But with words that do not change their form when pluralized, you will have to add an -s or -es.)

• The seaweed was destroyed by the fishes' overfeeding.

For more, see: http://grammar.ccc.commnet.edu/grammar/possessives.htm