Institute an editing council, a group of students who review all papers before you get them. Each person checks for a particular feature. If they note problems, the paper goes back to the writer for improvement. When you get a set of papers, skim through them. If you see some common problems, return the ungraded papers the next day and teach a lesson on the problems.
Students are to check their work and make any necessary changes before submitting again.
Some concluding remarks We don't want to penalize students for being inexperienced writers. If we mark every error, we may discourage them from taking risks and learning language the natural way by trial and error. Remember that some errors are actually signs of growth. Finally, be sure to communicate openly with students and parents about how you grade and why you use this method. A response to Jeremy.