Some Examples :
Asking For Permission
1. Do you mind if I leave now ?
2. May I come in?
3. Could I accompany you to go to shopping, please?
4. Excuse me, my I turn on the computer?
5. May I borrow your camera?
6. It's hot inside the room. May I open the window, please?
7. Please, can I have a look at your pictures?
8. Would it be all right if I borrowed your flash disk?
9. Would you mind if I asked you something?
10.Is it okay if I come a little bit late?
Giving Permission (positive responses):
1. By all means.
2. Go ahead.
3. Yes, why not.
4. All right, please do.
5. Yes, of course / Yes, please do.
6. Yes, that's fine / No problem.
7. Yes, certainly / Sure, go ahead.
8. Please feel free.
Refusing Permission (negative responses):
1. I'm afraid you can't do that.
2. You're not allowed to turn on my computer.
3. You should not permitted to leave your luggage here.
4. No. I'm sorry. You can't close the window.
5. I'm sorry, but that's not possible.
6. No, please don't.