This document discusses different types of subject-verb agreement in English grammar, including: 1. Concord of person between subject and verb (e.g. I am, you are, he is). 2. Subject-complement concord where the verb agrees with the subject (e.g. he is a doctor). 3. Object-complement concord where the complement describes the object (e.g. they elected him chairman). 4. Subject-object concord which requires agreement in number, person, and gender between subject and object or reflexive pronouns (e.g. he injured himself). 5. Pronoun concord where personal or possessive pronouns agree with their