Peter  couldn't do the exercise alone. , In 1950, people  couldn't use mobile phones., Mozart could play the piano when he was 5., Mary's grandfather  could play chess., I  could run very fast when I was younger., Could  you play the piano when you were seven?, Could dinosaurs fly?, Could you do me a favor?, Pamela was a ballerina, so she could dance., Sam  couldn't go to the party because he was busy.,

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