1. Expressing surprise
You’re kidding! Are you kidding? How amazing!
How is that possible? Good heavens! Really?
It can’t be true! Are you serious? Is that all?
2. Expressing belief / disbelief
I’m not surprised. I can’t believe it.
I think it’s true. I find that hard to believe.
You’re right. That’s wonderful.
I believe what you said. You’re not serious, are you?
I don’t doubt. Oh, come on! You must be joking.
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