Could/Couldn't

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When I was young, I ____ play the guitar: it was too difficult for me!

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Yesterday, Peter _______ do homework alone. So, he asked me for help.

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When his mother was young, she _______ skate but she can't do it now.

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We _______ open the door: it was locked from the inside!

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In 1945, people _________ play video games.

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Her grandmother was bilingual: she ________ speak both English and Spanish.

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In 1900, people _________  watch TV.

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In 1950, people ________  use mobile phones.