• MODALS OF SPECULATION
     Help
  • Your mother __________ a great cook. You are always so keen to get back home to eat!
    must be
  • I don't know why I am so tired these days. I __________ too hard. Or maybe I am not sleeping too well.
    may be working
  • Do you know where Carl is? He __________ out - his car keys are on the table.
    can't be
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