1. SINGULAR/PLURAL a hat hats 10. rooms 2. 3. a dress Chats basements 11. an earring 12. purses 4. a boss 13. a niece 5. an exercise 14. a woman 6. watches 15. children 7. gloves 16. a mouse 8. a sock 17. teeth 9. a drum 18. people LISTENING si alguien ​