Either and neither are masters of disguise! They can be pronouns, in which case they’re singular. Or they can belong to a two-part conjunction (either … or, neither … nor) joining two or more subjects. In that case, the verb must agree with the nearer subject.
In the questions below, decide whether either and neither are singular subjects, or conjunctions joining subjects. And once you’ve figured out which word is the subject, pick the verb that agrees.