You need a pen. Perhaps Jane has got one. Ask her
Jane, you haven't got a pen, have you?
You have to move a heavy table. You want joe to give you a hand with it. Ask him.
Joe, you couldn't give me a hand (with this table) , could you?
You're looking for Sarah. Perhaps Kate knows where she is. Ask her.
Kate, you don't know where Sarah is, do you? or ... you haven't seen Sarah, have you?