Are you sure? - Can I answer "I'm quite sure"?

[Ralahpik]

If someone asks me: "Are you sure?"...Can I answer "I'm quite sure"?

[Yankee]

Hi Ralahpik

Yes, you can say that. You might want to add the word 'yes' to the beginning of the sentence, however. In American English that would mean "I am very sure."
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