could (EN)
助动词

这个词也可以是以下词语的形式:
can (动词)

助动词 “could”

could, negative couldn't
  1. 可能
    If we hurry, we could catch the last train home.
  2. 可以(用于礼貌地请求许可)
    Could I use your phone to make a quick call?
  3. 可以(用于礼貌地请求他人采取行动)
    Could you please pass the salt?
  4. 可以(用于提供建议或建议)
    For your headache, you could take a pain reliever.