This document discusses subject-verb agreement rules in English grammar. It states that a singular subject takes a singular verb and a plural subject takes a plural verb. It also covers that words between the subject and verb do not affect the agreement, and that the verb agrees with the subject even when it precedes the subject. Finally, it addresses compound subjects, noting that subjects joined by "and" typically take a plural verb, while subjects joined by "either...or" or "neither...nor" take a verb agreeing with the closer subject.