- Missing comma after introductory elements
- Vague pronoun reference
- Missing comma in a compound sentence
- Wrong word
- Missing comma with a nonrestrictive element
- Wrong or missing verb ending
- Wrong or missing preposition
- Comma splice
- Missing or misplaced possessive apostrophe
- Unnecessary shift in tense
- Unnecessary shift in pronoun
- Sentence fragment
- Wrong tense or verb form
- Lack of subject - verb agreement
- Missing commas in a series