In your comments, you may want to refer to pages in the Skidmore Guide that may help students edit or revise.

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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