This document provides 15 rules for determining whether to use a singular or plural verb with different subject types in the English language. Some of the key rules covered include: using a singular verb with subjects connected by "or" or "nor"; ignoring prepositional phrases when determining the verb; "none" can be both singular and plural; collective nouns like "staff" can take either a singular or plural verb depending on whether the group is acting as a unit or individuals; and pronouns like "who" or "which" take the number of the noun immediately preceding them. The document aims to clearly explain the various rules in order to help the reader properly select singular or plural verbs to match subjects.