“Somebody” and “someone” can be treated as either plural or singular, depending on the context. When no one individual person is identified, these words are usually treated as plural: “When somebody runs a red light, they risk causing an accident.” Some traditionalists would insist on “he or she” in this context, but most modern speakers do not. When a single individual is clearly referred to, singular forms are appropriate: “somebody is coming to pick me up in a minute.”
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