• (New Season 8, lesson 6C) Past modals for speculation
     Help
  • She ___ studied really hard (probability). She passed all her exams with excellent grades.
    must have
  • He _________________ arrived by now (probability). It's only a 10-minute journey!
    must have
  • The boss is in a terrible mood. The meeting ___ been good. (certainty)
    couldn't have
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