a) You must stop here. - She must have stopped here, b) They must have seen a suspicious object, c) The thief must have known what was going on. d) He should be more careful. - He should have been more careful, e) You should call an ambulance. - You should have called an ambulance, f) You should have left your name and address with the police officer, g) He may be in the intensive-care unit. - He may have been in the intensive-care unit, h) The bag may have disappeared. - The bag may have been stolen, i) The bag may have been found.
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