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28 feb 2020

  • Japonés
  • Inglés (US)
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①He didn't know silk from cotton.
②He couldn't know silk from cotton.

My dictionary says ② cannot be used. Could you tell me why?

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  • Inglés (US)

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  • Inglés (US)
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①He didn't know silk from cotton.
②He couldn't know silk from cotton.

My dictionary says ② cannot be used. Could you tell me why?
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