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Expressing possibility and guessing (the past)

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  • The package (must have arrived / might not have arrived) earlier because it’s on the table now.
    must have arrived
  • She (must forget / must have forgotten) her umbrella because it’s still in the office.
    must have forgotten
  • He (may have forgotten / could not have forgotten) to call; he always remembers.
    could not have forgotten
  • the alarm / You / might not have heard / this morning.
    You might not have heard the alarm this morning.
  • The lights were off; they (must have gone / must gone) out.
    must have gone
  • She / her umbrella / must have left / on the train.
    She must have left her umbrella on the train.
  • You (must not have locked / could have locked) the door because it’s open now.
    must not have locked
  • the window. / might have / The cat / jumped / out of
    The cat might have jumped out of the window.
  • He must / his keys / have forgotten / at home.
    He must have forgotten his keys at home.
  • They / could / all the cookies / have eaten / last night.
    They could have eaten all the cookies last night.
  • He (may lose / may have lost) his phone; he’s been looking for it all day.
    may have lost
  • too hot. / could have burned / because / The cake / the oven was
    The cake could have burned because the oven was too hot.
  • The keys are not here. You (may have left / must leave) them in the car.
    may have left
  • She looks tired; she (must work / must have worked) late last night.
    must have worked
  • been delayed / The train / bad weather. / could have / because of
    The train could have been delayed because of bad weather.
  • She (must have missed / may not have missed) the train because she arrived late.
    must have missed
  • so quickly. / could not have finished / She / the project
    She could not have finished the project so quickly.
  • He (must not have finished / may have finished) his homework because it’s still on the table.
    must not have finished
  • him earlier. / He / must not / you calling / have heard
    He must not have heard you calling him earlier.
  • You / your wallet / could have forgotten / in the car.
    You could have forgotten your wallet in the car.
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