1. The document provides rules for determining subject-verb agreement in sentences. It discusses finding the subject and verb, as well as whether the subject is singular or plural to determine if the verb should be singular or plural.
2. Key factors that determine the number of the verb include whether the subject is singular or plural, compound subjects connected with and/or/nor/either/neither, pronouns as subjects like each/everyone, and subjects separated from verbs by prepositional phrases.
3. Examples are provided to illustrate each rule for determining subject-verb agreement. Tips are also given like adding -s to verbs for singular subjects and omitting -s for plural subjects.