When it comes to subject-verb agreement rules, the either-or construction can be a bit tricky. This is because there are two options presented, and the verb must agree with whichever option is chosen. Here’s what you need to know about subject-verb agreement with either-or:

1. Either-or always takes a singular verb.

When using either-or, the subject is always singular, and the verb must agree with that singular subject. For example, “Either the cat or the dog is responsible for knocking over the vase.” In this sentence, the singular verb “is” agrees with the singular subject “cat.”

2. The verb agrees with the subject closest to it.

Sometimes it’s unclear which option in an either-or construction is the subject. In these cases, the verb should agree with the one that’s closest to it. For example, “Either the students or the teacher is going to the field trip.” In this sentence, the singular verb “is” agrees with the singular subject “teacher,” which is closest to the verb.

3. Use plural verbs if both options are plural.

If both options presented with either-or are plural, then the verb must also be plural. For example, “Either the cats or the dogs are responsible for making the mess.” In this sentence, the plural verb “are” agrees with the plural subject “cats and dogs.”

4. Neither-nor follows the same rules as either-or.

When using neither-nor, the same rules apply as with either-or. The subject is always singular, the verb agrees with the subject closest to it, and plural verbs are used when both options are plural.

In summary, when using either-or or neither-nor constructions, it’s important to remember that the verb must agree with the subject presented. If the subject is singular, use a singular verb. If both options are plural, use a plural verb. And if it’s unclear which is the subject, use the one closest to the verb. By following these rules, you can ensure proper subject-verb agreement in your writing.