We use could to ask for permission. Could is more formal and polite than can: Could I ask you a personal question?

You use could when you are expressing strong feelings about something by saying that you feel as if you want to do the thing mentioned, although you do not do it.

"Could" is a modal verb used to express possibility or past ability as well as to make suggestions and requests. "Could" is also commonly used in conditional sentences as the conditional form of "can."

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