Both, either, and neither are used to talk about two things or people. The difference is about meaning: positive, choice, or negative.
Use both to refer to two items together.
Important: “both” is plural → use a plural verb.
Use either when there is a choice between two options.
Important: “either” is singular → use a singular verb.
Use neither to say that none of the two options is true.
Important: “neither” is singular → use a singular verb.
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