1. Can you send me the file within an hour?
2. Can you send me the file in an hour?
Are both grammatically correct? What is the difference?
Both are correct. I take 1 to mean the file should be sent at any time between now and one hour from now. I take 2 to mean the file should be sent only after an hour has passed.
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Both are correct.
I take 1 to mean the file should be sent at any time between now and one hour from now.
I take 2 to mean the file should be sent only after an hour has passed.
CJ