Asking for permission: Can I use your pen, please?
Can I sit here?
Is it okay if I sit here?
Can I ask you a question?
May I use your computer?
May I come in?
Can I take a look at your book?
Do you mind if I turn down the TV?
Do you mind if I use your phone?
Would you mind if I opened the window?
If you don't mind, I'd like to smoke.
I wonder if I could borrow your car for a few days.
Would it be all right if I borrowed your phone?
Giving permission:
Sure.
Sure, go ahead.
No problem.
Yes, you can.
Please feel free.
I don't mind.
Refusing permission:
I'm afraid not.
I'm afraid, but you can't.
I'm sorry, but that's not possible.
No, you cannot.
You couldn't do that.
Sorry, you are not permitted.
