Source : engVid.com
Can I borrow your pencil? (I want ….)
Could I borrow your pencil?
May I borrow your pencil? – This is the most polite way about asking someone for permission.
Do you mind if I borrow your pencil? – This is more polite than May. I hope …
No, I don’t mind. Here, you can use my pencil.
If I say, “Yes” means that I have a problem with that.

thanks….
its more clear now… ;0
thank you so much ..
really gd …thank you very much..pls add more video