I’m next. Reference “language is a very blunt instrument’. A cockney will reply ‘Was you?’ to a friend’s statement of his whereabouts last night when it should be ‘Were you?’ Or should it?
With a singular ‘you’ I reckon the cockney is grammatically correct as in ‘Was he?’ ‘Were they?’
Latin scholars and language pedants – sort this one out; or rather, sort out this one.