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Do you consider the subject in the following to be compound, justifying a singular verb?

"His impact and influence is undeniable."

On the one hand, the nouns do not form a common phrase; on the other hand, they have a similar meaning so might be considered a unit. What are you views? And do you know if usage is shifting?

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    ...in your case I think it's effectively a stylistic choice (i.e. - whether you consider "impact and influence" to represent a single pairing of two intertwined concepts/attributes, or two completely different things). I see nothing wrong with these written instances of his honesty and fairness is (known to all), for example. Sep 22, 2016 at 12:07

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