• Modal Verbs
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  • An U.F.O? That's impossible! It could _____ _____ a plane or a hot air balloon.
    have been
  • We _____ _______ had the ceremony inside the church instead of in the park. Anyway, it's nice here.
    could have
  • Complete the sentence with a past modal: Ana looks tired. She must...
    e.g. have slept badly last night
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