• PERDECT MODALS
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  • I AM SURE she was at home.
    She must have been at home. (You’re certain about a past fact → must have.)
  • I THINK they forgot about the meeting.
    They might have forgotten about the meeting. (Not sure → might have for possibility.)
  • IT'S IMPOSSIBLE that he saw me.
    He can’t have seen me. (Past impossibility → can’t have.)
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