The document discusses 14 rules for subject-verb agreement in English sentences. It provides examples for when to use singular or plural verbs depending on whether the subject is singular or plural. Some key points covered include using singular verbs with collective nouns representing a unit, and singular verbs with words ending in "-s" like economics or with relative pronouns like "who" or "that" depending on the noun they refer to. The document aims to clearly explain the rules of subject-verb agreement in English.