Write the plurals. 1. a cherry 2. a road 3. a goose 4. an envelope 5. a bench 6. a mosquito 7. a bush 8. a country 9. a banana 10. a key 11. a tower 12. a person 13. a monkey 14. a potato 15. a wife 16. a hippo 17. a shelf 18. a roof 19. a tomato 20. a cliff