4. For compound subjects bound by or/nor, the verb corresponds to the subject that comes close to it. However, there are exceptional cases for some of these schemes when it comes to the subject-verb agreement. Consider some of these exceptions: if “author” and “publisher” are related to titles that relate to a single person (i.e. the same person is both author and publisher), only the first title will bear the definitive article `the`, and a singular verb will be used accordingly. But if the two titles refer to two different people, “author” and “editor” must attract the particular article, and a plural verb would be used. Plural numbers take a singular verb when we use them in an expression to indicate a sum or unity. The examples are: it is always the watchword that determines whether the verb would be singular or plural. In your sentence, one of the boys who is in this school teach is my friend. The verb is always unique. Note that “who teaches in this school” is a relative clause and is related; that is, deletion does not change the meaning of the sentence. TEACH agrees with BOYS, which is the precursor to WHO`s relative pronodem.
In other words, what I am saying is that your sentences must be the same in person, in number, in voice and in tension; that is, there must be adequacy or concordance in your sentences in terms of person, number, voice and tension. However, the plural verb is used when the focus is on the individuals in the group. It`s much rarer. The appropriate structure is: one of the boys (who teaches in this school) is my friend. “Who teaches in this school” is a relative clause (akademia.com.ng/what-is-a-relative-clause-types-functions-and-examples/) and is optional. However, the pronominal precursor “boy” goes away with “teach,” while “one” is the keyword with “is.” Article 9. For collective subtantives such as the group, the jury, the family, the public, the population, the verb can be singular or plural, depending on the author`s intention. For example, she writes every day. Exception: If you use the singular “she,” use plural shapes. For example, the participant was satisfied with his work. You currently play a leadership role in the organization. To ensure a correct and consistent language when speaking or writing, you must ensure that the elements of the sentence are consistent, and that you internalize all the rules and patterns.