The document discusses subject-verb agreement and verb tenses in English grammar. It explains that the subject and verb must agree in number, with singular subjects taking singular verbs and plural subjects taking plural verbs. There are four main verb tenses in English - present, past, future, and perfect - with additional subdivisions like simple and continuous. The document provides examples of subject-verb agreement and conjugations in the present, past, and future tenses. It also outlines several rules governing subject-verb agreement, such as with compound subjects and collective nouns.