Oh thank you [blushing]! For me, the hardest part of writing is the fact that the words stay where they are. You can´t just mumble a bit and hope no one heard you using the wrong tense. Hmm... Prepositions (at, on?!) and use of articles ("the", or not...) are the worst. Oh! And infinitive or -ing forms. Google is my friend, but not the all-knowing kind, sadly. :)
And yes, I teach for a living.... ;)