When you ask for permission to use something that belongs to someone else you have to do your best to be polite. It is desirable to use the word “please.”
Modals verbs are commonly used for asking permission
Can I ask you a question?
May I have a piece of cake?
Could I get you to turn off the lights
Some other common phrases are
Do you mind if I smoke?
Would you mind if I asked you something?
Is it okay if I sit here?
Would it be all right if I borrowed your lawn mower?