Raymond: Can someone lend me a drill?
Geoffrey: Sorry, mine's broken. 
Francis: You can borrow mine. I promised Molly to put up a new shelf in the kitchen :D
Raymond: Haha, looks like I'll be doing you a favor?
Francis: Definitely yes! Now I'm going to have a perfect excuse ;)
Geoffrey: Does anyone want to borrow my lawn mower?
Geoffrey's drill is broken. Francis will borrow his to Raymond as he promised Molly to put up a new shelf and needs an excuse. 