Modals of Permission are used for asking questions in several different ways. Depending on which modal you use it also determines the level of politeness. The Modals of Permission include Can, Could, May, and Might.
The modals of permission are generally in question form.
Questions
Modal + Subject + Base verb + Complement?
Can I go to the bathroom?
May I have more sugar?
Could I sit here?
Might I have some water?