Asking for Confirmation
S + 是不是 + O? (Câu hỏi xác nhận)The structure '是不是' is used to ask a question to confirm information the speaker already knows or suspects. It is similar to adding 'isn't it / right?' to the end of a sentence in English. The answer is usually '是' (yes, that's right) or '不是' (no, that's not right).
你是不是饿了?
Are you hungry?
这是不是你的饭?
Is this your food?