Pronoun Agreement Pronouns should agree with their antecedents. He , she , his , her , and their are confused by many writers. Each student is asked to bring his or her supplies to class. NOT Each student is asked to bring their supplies to class. Apostrophe Usage Apostrophes are often misused, especially when forming possessive forms of nouns.
Possessives Add an apostrophe and an s to singular nouns to indication possession.
According to most current texts, add the apostrophe after the letter s to indicate a plural possessive, unless the dual s sounds are pronounced. We located the cat's toy under the chair. The cats' toys were tattered after years of play. The Smiths' own two cats and a dog. The Jones's dogs chase cats.