The document discusses subject-verb agreement rules. It explains that the subject may not always precede the verb in questions. When two subjects are joined by "and" they typically take a plural verb, but if they refer to the same thing the verb is singular. If words like "each", "every", or "no" precede the subject, or subjects joined by "or", "nor", "neither/nor", "either/or", and "not only/but also", the verb is singular. Examples are provided to illustrate each rule.