Could i go out? - Yes, of course.
May i come in? - Sure.
Can i open the window? - No, it's cold outside.
May i use your book? - Yes, of course.
Can i help you? - Sure.
Can i close the door? - Sure.
Could i sit down? - Yes, of course.
Can i water flowers? -No, i will do it on my own.
May i switch off the TV? - No, i am watching it now.
Can i borrow you rubber? No, i am using it now.