The document discusses various types of subject-verb agreement in English grammar. It covers agreement rules for singular and plural subjects, collective nouns, phrases and clauses, indefinite pronouns, subjects joined by 'and', subjects joined by 'or' or 'nor', proximity to the verb, collective nouns, amount expressions, contractions, predicate nominatives, pronouns and their antecedents, indefinite pronouns, number and gender. The document provides examples and explanations for each of these agreement rules and cases.