He can't have seen her., It's not possible that he saw her., I must have left my wallet in the taxi., I'm sure that I left my wallet in the taxi., Daisy might have forgotten about your birthday., I think that Daisy forgot about your birthday., He might have missed the bus., He's late. Perhaps he missed the bus., They might have eaten too much., They got a stomachache., You can't have won that game., It's impossible that you won the game!, You must have watched this film., I'm sure you've already seen this film!, My brother could have seen a ghost., Perhaps my brother saw a ghost., I may have heard that strange voice., I think I heard a strange voice.

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