Recently Cec Murphy ran a series on using apostrophes correctly. Here is an excerpt.
The possessive of most singular nouns is formed by adding an apostrophe and an
s. Except for a few irregular plurals that don’t end in s, the
possessive of plural nouns is formed by adding an apostrophe only.
horse’s mouth, a bass’s stripes, puppies’ paws, children’s literature.
This general rule covers most proper nouns, including names ending in
s, x, or z, and both are singular and plural forms, as well as
letters and numbers. Click here to read the entire article.
- Posted in: Writing