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How to respond to “Are you sure you won’t have another piece of cake”? Is “Okay, go on then” appropriate?
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wangqh2696122How to respond to “Are you sure you won’t have another piece of cake”?
Is “Okay, go on then” appropriate?
Yes that's fine in an informal situation.
This question is asked in reverse, because if you answer YES, strictly speaking that means "YES, I'm SURE I WON'T have another piece of cake". If you just answered YES, the person asking the question might ask you what you mean. Other answers you could give:
"YES, I'm SURE" or "I'm sure, thanks" - I'm sure I WON'T have another
"No thanks" - I WON'T have another, thank you
"OK, you talked me into it" - a joking way of saying "Yes I WILL have another"
"Yes please" or "Yes I will, thanks" = "Yes I WILL have another"

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By saying "Okay, go on then", what does the speaker mean? Does he want another?
Yes. He's saying "Go on then, give me another piece". That's why it's a bit informal.
Thank you both!
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A response to are you sure

Are you sure?

eg Yes, I am, thank you.