It seems pretty obvious but can be tricky to figure out to how to use the following questions.
When asking someone to do something for you, we use "Could you...?". When asking if you can do something, we use "Could I...?".

Here are some examples.

Could you pass me the tissue please?
Could you show me your ID please?
Could you lend me a pencil please?

Could I have a tissue please?
Could I see your driver's license please?
Could I borrow a pencil please?

I hope these are of some help when it comes to using "Could I/you...?"




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