The basic rule states that a singular subject<span> takes </span>a singular verb<span> while a plural ... </span>subjects<span>connected by or, either/or, or neither/nor </span>require a singular verb<span>.</span>
Explanation: when writing any sentence, we need to make sure to follow the subject-verb agreement. Subject-verb agreement simply means the subject and verb must agree in number (both need to be singular or both need to be plural). So if we have a singular subject (for example: he, she, it, the dog, the flower, etc), we have to use a singular verb (for example: he runs, the dog barks, etc).
