Either Are and Either Is

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Either Are and Either Is :

As a subject, “either” is singular. it’s the opposite of “both,” and refers to one at a time:

“Either ketchup or mustard is good on a hot dog.”

But if “either” is modifying a subject in an “either . . . or” phrase, then the number of the verb is determined by the number of the second noun:

“Either the puppy or the twins seem to need my attention every other minute.”

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