either are vs either is :

either are or either is

As a subject, “either” is singular. it’s the opposite of “both,” andrefers to one at a time: “Either ketchup or mustard is good on a hotdog.” But if “either” is modifying a subject in an “either . . . or”phrase, then the number of the verb is determined by the number of thesecond noun: “Either the puppy or the twins seem to need my attentionevery other minute.”

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