The Top Twenty

1. Wrong word
2. Missing comma after an introductory element
3. Incomplete or missing documentation
4. Vague pronoun reference
5. Spelling (including homonyms)
6. Mechanical error with a quotation
7. Unnecessary comma
8. Unnecessary or missing capitalization
9. Missing word
10. Faulty sentence structure
11. Missing comma with a nonrestrictive element
12. Unnecessary shift in verb tense
13. Missing comma in a compound sentence
14. Unnecessary or missing apostrophe (including its/it’s)
15. Fused (run-on) sentence
16. Comma splice
17. Lack of pronoun-antecedent agreement
18. Poorly integrated quotation
19. Unnecessary or missing hyphen
20. Sentence fragment