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Ability & Possibility

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  • She ______ swim across the lake when she was younger.
    could
  • You ______ borrow my car if you promise to drive carefully.
    can
  • Dogs ______ understand human emotions.
    can
  • We ______ enter the building yesterday because the door was locked.
    couldn't
  • She ______ have missed the train; it left 10 minutes ago.
    couldn't
  • ______ you play the guitar when you were 10?
    Could
  • This ______ be the right answer, but I’m not sure.
    could
  • You ______ park here—it’s a no-parking zone!
    can't
  • I ______ speak French, but I’m learning now.
    can't
  • ______ this medicine cause side effects?
    can
  • Students ______ use phones during the exam.
    can't
  • He ______ run a marathon last year, but now he’s injured.
    could
  • The keys ______ be in the drawer. Check there!
    could
  • My brother ______ solve complex math problems easily.
    can
  • Elephants ______ remember places for many years.
    can
  • It ______ rain later, so take an umbrella.
    could
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