Anonymous Could you tell me that he is right or not? He is a little unsure. It is indeed emphatic 'do', it is not particularly formal, and it is common enough when needed.
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AnonymousCould you tell me that he is right or not?He is a little unsure. It is indeed emphatic 'do', it is not particularly formal, and it is common enough when needed.
Anonymoustold me that it was very formal and not common.It's not very formal, but it's true that it's not common in the context you quoted. Stress "do" with your voice when you say it.
AnonymousCould you tell me that he is right or not?Could you tell me whether he is right or not?