You are encouraged to ask people for help in revising and editing your papers, but then make the revisions and corrections yourself. If your instructor discovers that you didn't do the work you submitted, the instructor may take punitive action against you. Also, teachers hate going through the ugly procedures they have to start when they discover plagiarism, so if it doesn't happen, everyone is happier. Well, that's what the whole course is about. Think about the purpose of the assignment.
Good papers accomplish their purposes.
Think about your audience. Your instructor is almost always your audience, but sometimes the instructor designates other audiences for you to consider. In either case, remember that readers want to be interested and respected. Good papers get through to their intended readers. Use a moderate tone unless you have strong reason otherwise.