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Sentence: A recent review of our records indicates that one or more of your dependents does/do not have a valid birthday on file

This is actually for a business letter and we have conflicting opinions in the office if the verb should be "does" or "do". Thanks

marked as duplicate by sumelic, AmE speaker, Mitch, JMP, Phil Sweet Aug 8 '18 at 20:21

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Go ahead and have your argument, but why not find a way round it that avoids the disagreement?

A recent review of our records reveals that at least one of your dependents does not have a birthday on file

The direct answer to the question is that there is little to choose between the two. I should marginally go for the singular. On thing, however, is certain: whichever way you jump between singular and plural, some readers will think you made a mistake. So ‘at least’ is safer.

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