could (EN)

auxiliary verb

auxiliary verb “could”

1. indicates that something has the potential to occur
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   If we hurry, we could catch the last train home.
2. expresses a polite request for permission
   Could I use your phone to make a quick call?
3. expresses a polite request for someone else to take action
   Could you please pass the salt?
4. offers a recommendation or advice
   For your headache, you could take a pain reliever.