In your comments, you may want to refer to pages in the Skidmore Guide that may help students edit or revise.
If the problem is: turn to page: Agreement, nouns and verbs 21 Agreement, pronouns and nouns 21-22 Apostrophes in possessives 28 Awkward sentences 39-40 Cliches 15 Comma splices and run-on sentences 20 Conclusion 9-10 Documentation form 43-81 General grammar errors 17-32 Introduction 9 Its/it’s confusion 29 Incorrect modifiers 23-24 Passive voice 13 Proofreading
2, 11 Punctuation problems 25-32 Punctuation with quotations 31-32 Quotations, correct and effective use of 46, 48-50, 82-90 Semicolons 19, 26-27 Sentence fragments 20 Syntax 40 Transitions 4 Vagueness 39 Who/whom error 24 Wordiness 12, 16