I'm sitting here writing an essay (well, I was, I'm now writing this ). Anyway, it's the first formal thing I've written in ages, and I've totally forgotten how to use apostrophes in the context of "its" its it's its' What's the difference? I know there is one, it's to do with possesion (I think; or is that apostrophes with other words?) and I know that "it's" can be used in place of "it is" but what else is there??