Most writers understand that nor always follows neither, and or always follows either. But many get confused when confronted with subject-verb agreement, especially if one element of the neither/either construction is singular and the other is plural. If both elements are either singular or plural, no confusion exists. It’s when one element is one and the other the other that the question gets raised.
For instance, consider this example sentence:
The number adopted by the verb conjugation should match the number of the closer subject element. Thus, we could have either of the following sentences:
Either the welding procedure or the welding materials were changed.
So when using nor/or, agree your verb with the nearer subject. Precision of language provides that attention to detail which will not only present your message more effectively but also better represent both you and your brand in the minds of your audience.