English Translation
Either you or Mary must go.
Does deben refer to an implicit ustedes? Could one use debéis instead?
Either you or Mary must go.
Does deben refer to an implicit ustedes? Could one use debéis instead?
Yes. To be honest, I’m not sure who’d say it like that, mixing tú with ustedes.
My guess is somewhere where they don’t use vosotros.
You can take any random person from Latin America and almost guarantee that he won’t use vosotros forms. I still find it weird to use a plural form when only one has to do something, though.