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	20 Most Common Errors

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	1. Missing comma after an introductory element

	2. Vague pronoun reference

	3. Missing comma in a compound sentence

	4. Wrong word

	5. Missing comma(s) with a nonrestrictive element

	6. Wrong or missing verb ending

	7. Wrong or missing preposition

	8. Comma splice

	9. Missing or misplaced possessive apostrophe

	10. Unnecessary shift in tense

	11. Unnecessary shift in pronoun

	12. Sentence fragment

	13. Wrong tense or verb form

	14. Lack of subject-verb agreement

	15. Missing comma in a series

	16. Lack of agreement between pronoun and antecedent

	17. Unnecessary comma(s) with a restrictive element

	18. Fused sentence

	19. Misplaced or dangling modifier

	20. Its/It's confusion

EasyWriter Resources / 20 Most Common Errors /
9. Missing or misplaced possessive apostrophe

To make a noun possessive, add either an apostrophe and an -s (Ed's book) or an apostrophe alone (the boys' gym).

For practice recognizing and editing this error, go to Exercise Central.