could

/kʊd/

verb

(auxiliary verb, defective) To know how to; to be able to.
"She can speak English, French, and German. I can play football. Can you remember your fifth birthday?"
Similar: be able to
(modal auxiliary verb, defective) May; to be permitted or enabled to.
"You can go outside and play when you're finished with your homework. Can I use your pen?"
Similar: may
(modal auxiliary verb, defective) To have the potential to; be possible.
"Animals can experience emotions."

noun

Something that could happen, or could be the case, under different circumstances; a potentiality.

Practice "could" in context

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