Singular or plural after either?
Either is normally used with a singular verb: Has either of you been to Paris?Either Lee or David is responsible. Informally, however, the plural is used when the choices are regarded collectively rather than individually, and it is quite natural to say Have either of you been to Paris?, which permits the possibility that both the people addressed have done so. When either...or... occurs with a mixture of singular and plural subjects, the verb traditionally agrees with the subject that is closer to it: Either Lee or his parents are at home.
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