Odd corrections. I've noticed that sometimes people get very.. annoying when they correct someone's English notebook. Some of the time I see nothing wrong with the way they write it, and this is coming from someone who has gotten the highest possible marks on writing English essays in a statewide test the past four years, and has taken two college classes dedicated to just writing essay after essay. I think for the most part, nobody has to be spot-on when they write English, since they most likely write it the way they've heard it being spoken. Rarely, if ever, do even native English speakers use perfect grammar all the time, even more so when speaking. Try to not jump on the tiny mistakes, especially when it's their first time writing a notebook. You could offer a suggestion to rephrase the sentence instead of correcting it when it could really go both ways.