Com demanar permís an anglès:

Can I ...., please?
Could I ...., please?

Si necessitem ser més formals:

Would it be ok if I  .......?
Would it be alright if I .....?

Examples:

Can I borrow your pen, please?
Could I go to the toilet, please?
Would it be ok if I use the phone?
Would it be alright if I take a day off?