Could vs Would in Questions?
When Making General Polite Suggestions or Asking a Question, Both Could and Can Are Possible ("Excuse Me, Can/Could You Tell Me What Time It Is?"). .. . Would...
When making general polite suggestions or asking a question, both could and can are possible ("Excuse me, can/could you tell me what time it is?"). ... Would can also be used to ask polite questions ("Would you mind if I had another cup of tea?"), or to wish for something ("I wish she would write a book.").
Where we use would and could?
Could, would, and should are all used to talk about possible events or situations, but each one tells us something different. Could is used to say that an action or event is possible. Would is used to talk about a possible or imagined situation, and is often used when that possible situation is not going to happen.
Can I use could in a question?
We often use could in a question to ask somebody to do something. The use of could in this way is fairly polite (formal): Could you tell me where the bank is, please? Could you send me a catalogue, please?