agreement with compound subjects
Verbs after subjects joined by and, or, nor, and phrases like as well as.
Two subjects joined by and take a plural verb: The editor and the designer are ready. If they name one idea, keep the verb singular: Macaroni and cheese is on the menu. With or or nor, the verb agrees with the nearer subject: Neither the notes nor the index is complete. Neither the index nor the notes are complete. Phrases after as well as, along with, together with, and in addition to do not make a singular subject plural: The director, as well as the deputies, is attending.
Examples
UseThe report and the appendix need review.
UseNeither the staff nor the director has a copy.
AvoidThe director, as well as the deputies, are attending.