This is a list of 18 common grammar mistakes that my seventh and eighth students make.
They are given this "punch list" to look over before handing in a paragraph or essay. Any rule they break, they have to write 25 times. Sounds mean, but it makes them proofread. They are always allowed to ask me grammar questions or have a friend review their paragraphs and essays before handing in their work if they think they may be breaking a rule.