Who, That, Which Rules: 1) Who and sometimes that refer to people. That and which refer to groups or things. Examples: Anya is the one who rescued the bird. "The Man That Got Away" is a great song with a grammatical title. Lokua is on the team that won first place. She belongs to a great organization, which specializes in saving endangered species.     2a) That introduces what is called an essential clause (also known as a restrictive or defining ...