Subject-verb agreement is a grammatical rule that states that the verb or verbs in a sentence must match the number, person, and gender of the subject. In English, the verb needs to match just the number and sometimes the person of the subject. For example, the singular subject "it" and the plural subject "they" use different versions of the same verb: "it goes" and "they go". The basic rule is that a singular subject takes a singular verb, while a plural subject takes a plural verb. However, there are exceptions to this rule, such as when using the singular "they," which takes plural verb forms. Compound subjects joined by "and" are always plural, while with compound subjects joined by "or/nor," the verb agrees with the subject nearer to it. Learning the rules for subject-verb agreement can be challenging at first, but with enough practice, they start to make more sense.