Sure, I dislike bad grammar, and I do my best to spell things correctly and all that jazz. But I've gotten tired of complaining about it, because everyone makes mistakes eventually--I don't want to make a big deal about something and then eat my own words a few days later. School-wise, I don't make many grammatical errors, and usually can instinctively tell where commas need to go, etc. But I'm horrible at the grammar work itself--identify what's an adverb phrase, an adjective phrase, and so on. I wish now that I'd actually worked hard last year and could still remember that stuff, because I feel like I'm missing an important part of my English education.