How do you check for pronoun/antecedent agreement?
Check the number of your pronoun and antecedent.
Basic Principle: A pronoun usually refers to something earlier in the text (its antecedent) and must agree in number singular/plural with the thing to which it refers. The indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular. So if your antecedent is singular, your pronoun must be singular. And if your antecedent is plural, your pronoun must be plural.