“I thought I had revised my assignment, but my instructor said I’d just corrected the typos.” It’s always a good idea to clarify what revision means with a particular instructor. Generally, though, when a writing teacher asks for a revision, minor corrections will not be enough. Plan to review your entire draft, and be prepared to make major changes if necessary. Look for sentence-level errors and typos later, during the editing stage, since these may disappear or change as you revise.