A: I can't find the file for ABC Ltd.
B: I'm not surprised. Mr. Smith had it last. He ........... put it anywhere. He never replaces things.
The answer is might have but I think we can use must have as well. I would be grateful if you could share your knowledge with me.
The words 'may' and 'might' suggest a 'possibility'; whereas 'must' means a positive decision. "
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The words 'may' and 'might' suggest a 'possibility'; whereas 'must' means a positive decision.
You could say, "He must have put it somewhere!"