In Present tenses^x, Modal verbs^x, Plurals^x

The article you quote is about the relationship between car and its. Every car must have its brakes tested. The article is not about subject-verb agreement. But since you ask, there are two grammatical facts to consider: 1. The modals (can, will, must, ...) do not change form in...

The pattern 'either of plural noun' doesn't go well with the present tense unless you have a modal verb. 1. Either of you could be right. Either of you might be right. 2. Either of the two answers will do. Both answers are correct. Each of the two answers is correct. 3. Either of these...