I'm generally pretty good with my grammar etc but I've never really got the hang of when to use these words. Funny how you can come through 13 years of British education and not actually be told/corrected on it once... I remember getting to Year 3 and finding out I'd been spelling 'was' as 'woz' the whole time and was absolutely raging the teachers had never pointed me in the right direction!
So yeah, when do you use 'written' and when do you use 'wrote'?
While we're at it, effect/affect? It's not just as simple as noun/verb is it?