when we feel sure about what happened. - We use must have + V3 ..., when we think it's possible that something happened. - We can use might have/may have/could have + V3 ..., when we think it's possible that something did not happen. - We can use might have/may have/could not have + V3 ..., when we feel sure that something did not happen. - We use can't have + V3 ...,

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