This document discusses subject-verb agreement rules in sentences. It states that the subject determines if the verb is singular or plural. Prepositional phrases between the subject and verb do not usually affect agreement. Sentences starting with "there" or "here" place the subject after the verb. Verbs agree with the closest subject if subjects are joined by "or", "nor", "neither/nor", "either/or", or "not only/but also". Collective nouns like "herd" and "class" usually take singular verbs. Verbs are plural if subjects joined by "and" refer to different things.