I'm sure that David took your books by mistake. - David must have taken your books by mistake., It was a mistake to park outside the police station. - You shouldn't have parked outside the police station., It was unnecessary for you to learn it by heart. - You needn't have learned it by heart., I'm sure that Liz hasn't met Harry before. - Liz can't have met Harry before., Perhaps Ann hasn't left yet. - Ann might not have left yet., Pam and Tim possibly have decided not to come. - Pam and Tim might have decided not to come., I think you were wrong to sell your car. - You shouldn't have sold your car., Perhaps Alan didn't mean what he said. - Alan might not have meant what he said.,

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