Possessive Nouns

To make a singular noun possessive, add 's. (book's)
If a noun ends in s and is plural in meaning, add only an apostrophe. (bosses')
If a noun is singular in meaning but ends in -s, add 's. (boss's)
If a plural noun does not end in s the possessive is formed by adding s.

Indicate whether or not a noun is singular, singular possessive, plural, or plural possessive.