Hey, can I have some of this paper? [these are cut-up pieces of scrap paper--librarians call them p-slips for some reason.]
How many can I have? As many as you want.
Okay, I'll take three. Or four. Or no, just three. Here, I put these back for you.
So what's the policy on these pencils? I have to bring it back as soon as I write something down, right? I have to bring it right back? No, you can hang onto it while you're in the library and just give it back at the end when you leave.
But what if I forget to bring it back? It's not the end of the world.