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Two people in a bar.

Woman: I got a B on my final exam.

Man: That's why you're here? / Is that why you're here?

Are these equally idiomatic? What's the difference between them?

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  • "Is that why you're here?" sounds more natural to me but both are grammatically correct.
    – 79037662
    Jan 30 at 18:52

1 Answer 1

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'Is that why you're here?' is a question.

'That's why you're here?' is a question expressed as a statement. When written, the final question mark identifies it as a question, and when spoken, there would be a rising intonation.

Both are correct, and both mean the same thing.

Statement questions (Cambridge Dictionary)

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